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1. How reproducible are methods to measure the dynamic viscoelastic properties of poroelastic media?

Author

Bonfiglio, Paolo, Pompoli, Francesco, Horoshenkov, Kirill V., Rahim, Mahmud Iskandar B Seth A, Jaouen, Luc, Rodenas, Julia, Becot, Francois-Xavier, Gourdon, Emmanuel, Jaeger, Dirk, Kursch, Volker, Tarello, Maurizio, Roozen, Nicolaas Bernardus, Glorieux, Christ, Ferrian, Fabrizio, Leroy, Pierre, Vangosa, Francesco Briatico, Dauchez, Nicolas, Foucart, Felix, Lei, Lei, Carillo, Kevin, Doutres, Olivier, Sgard, Franck, Panneton, Raymond, Verdiere, Kevin, Bertolini1, Claudio, Bar, Rolf, Groby, Jean-Philippe, Geslain, Alan, Poulain, Nicolas, Rouleau, Lucie, Guinault, Alain, Ahmadi, Hamid, and Forge, Charlie

Subjects
Physics - Classical Physics, Condensed Matter - Soft Condensed Matter, Physics - Applied Physics
Abstract

There is a considerable number of research publications on the acoustical properties of porous media with an elastic frame. A simple search through the Web of ScienceTM (last accessed 21 March 2018) suggests that there are at least 819 publications which deal with the acoustics of poroelastic media. A majority of these researches require accurate knowledge of the elastic properties over a broad frequency range. However, the accuracy of the measurement of the dynamic elastic properties of poroelastic media has been a contentious issue. The novelty of this paper is that it studies the reproducibility of some popular experimental methods which are used routinely to measure the key elastic properties such as the dynamic Young's modulus, loss factor and Poisson ratio of poroelastic media. In this paper, fourteen independent sets of laboratory measurements were performed on specimens of the same porous materials. The results from these measurements suggest that the reproducibility of this type of experimental method is poor. This work can be helpful to suggest improvements which can be developed to harmonize the way the elastic properties of poroelastic media are measured worldwide.

Published
2018
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4. Fused filament fabrication process window for good interlayer bonding: Application to highly filled polymers in metallic powder

Author

Theze, Alexis, Guinault, Alain, Regnier, Gilles, Richard, Sebastien, and Macquaire, Bruno

Subjects
Shear (Mechanics) -- Research, Materials research, Metal powders -- Production processes, Metal powder products -- Production processes, Polymers -- Production processes, Engineering and manufacturing industries, Science and technology
Abstract

Extending the fused filament fabrication process to highly filled thermoplastics in metallic powder used in metal injection molding is a promising method to produce small series. However, the lack of adhesion between deposited filaments can cause ruptures during the fabrication or debinding process. We designed a simple device to measure the shear strength required to tear off a filament deposited on a substrate. This device makes it possible to quickly determine the processing window for a good welding of filaments. We developed a 2D thermal simulation using the finite difference method while integrating the enthalpy of fusion and crystallization kinetics of the material. We then fitted it to the thermal measurements at depths of 0.45 and 0.75 mm under the substrate surface using small-diameter thermocouples. Simulation results highlight the key role of the thermal contact resistance between the filament and the substrate in the evolution of the interface temperature. This provides essential information to explain the process window that can be determined experimentally. The characteristic time of macromolecule diffusion was determined by rheological measurements and was found to be too small to play a role in filament bonding for the simulated cooling rates for the studied material. The methodology introduced in this work was used to improve highly filled polymers interlayer adhesion, but it can be used to improve other filled or unfilled polymers. KEYWORDS feedstock material, fused deposition modeling, fused filament fabrication, highly filled thermoplastic, process window, thermal simulation, thermoplastic welding, 1 | INTRODUCTION Metal injection molding (MIM) is a process for molding highly filled polymers with metallic powder in the same way as thermoplastic injection molding with the aim to [...]

Published
2022
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20. Origin of an intermediate peak in DMTA analysis of multilayer ABS/PC samples.

Author

Alkhuder, Aboubaker, Caro, Anne‐Sophie, Gervais, Matthieu, Guinault, Alain, Ienny, Patrick, Perrin, Didier, and Sollogoub, Cyrille

Subjects
DYNAMIC mechanical analysis, POLYMER blends, ACRYLONITRILE butadiene styrene resins, ACRYLONITRILE, FINITE element method, BUTADIENE, POLYCARBONATES
Abstract

Three layers film shaped by thermocompression of acrylonitrile butadiene styrene copolymer and polycarbonate have been analyzed in dynamic mechanical thermal analysis in tensile mode. They present two peaks as the film is loaded perpendicularly to the layers and three peaks as the film is loaded in parallel to the layers. Numerical computations confirm that the origin of this peak is not related to a mechanical issue such as the transmission of the imposed deformation from one layer to the other. Using this method, it is demonstrated that this third peak can only be obtained assuming a material transition with its own behavior between layers. Tan δ measurements provide a simple and useful experimental tool to understand more about the interfacial zone in polymer blends. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Thermal ageing of bonded assemblies. Effect of adhesive curing degree.

Author

Delozanne, Justine, Montana, Juan Sebastian, Guinault, Alain, Desgardin, Nancy, Cuvillier, Nicolas, and Richaud, Emmanuel

Subjects
CURING, TENSILE tests, INFRARED spectroscopy, THIN films
Abstract

This paper reports the failure of bonded assemblies submitted to thermal ageing. Adhesives are either fully or incompletely cured. Despite comparable initial properties, depletion of mechanical properties (evaluated from single las shear tests) is faster in the case of incompletely cured polymer. A series of comprehensive experiments were conducted on thin films of adhesive itself and some model systems based on its main components. According to tensile tests and kinetic curves of stable oxidation products detected by Infrared spectroscopy, fully cured epoxy would oxidize faster (because of greater concentration in oxidizable sites). Oxygen diffusivity was observed to be comparable in both systems. It results in a lower thickness of degraded layer in the case of fully cured samples, which explain the results obtained in bonded assemblies. [ABSTRACT FROM AUTHOR]

Published
2023
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31. Effect of biaxial stretching of nanolayered poly(ethylene furanoate) (PEF) films on gas barrier properties

Author

Guinault Alain, Messin Tiphaine, Anderer Gilbert, Krawielitzki Stefan, Sollogoub Cyrille, Roland Sebastien, Grandmontagne Anne, Dole Patrice, Julien Jean-Mario, Loriot Catherine, and Vincelot Thierry

Subjects
Matériaux [Sciences de l'ingénieur], Micro et nanotechnologies/Microélectronique [Sciences de l'ingénieur], Polymères [Chimie]
Abstract

Online Food packaging films must be reinvented in order to meet the new ecological requirements and challenges. In particular, efforts have been directed to reduce the use of petrochemical polymers and to develop biobased and/or biodegradable polymers. Among those, Poly(ethylene furanoate) (PEF) is a new promising biopolymer with high gas barrier and good mechanical properties, but its high price limits currently its industrial applications. Its combination with another polymer is thus of great interest and film coextrusion could be a relevant processing method for PEF. Nanolayer coextrusion can create hundreds to thousands micro or nanolayers and has been shown to improve the gas barrier properties of some polymers due to various confinement effect [1,2]. In this study, a new grade of PEF, developed by AVA Biochem in the scope of the H2020 Mypack program, has been combined with PET using nanolayer coextrusion. Multilayered films with different PEF layer thicknesses (varying from the micrometer down to the nanometer scale) have been successfully processed. AFM observations have shown the continuity of the PEF layers with individual thicknesses as thin as 40 nm. PEF was amorphous at the end of the coextrusion step and post-thermal annealing was necessary to get a crystallinity degree of 14%. Surprisingly, the gas barrier properties were not improved by the crystallization step. While PEF alone is too brittle to withstand any deformation, it was possible to biaxially stretch amorphous PEF/PET multilayered films with draw ratio as high as 4,5 x 4,5. After a subsequent crystallization, an improvement of a factor 4, compared to the bulk PEF, has been obtained for the gas barrier properties. Projet européen Mypack

Published
2021

32. Relationship Between Crystallization, Mechanical and Gas Barrier Properties of Poly(ethylene furanoate) (PEF) in Multinanolayered PLA-PEF and PET-PEF Films

Author

GUINAULT, Alain, MESSIN, Tiphaine, ANDERER, Gilbert, KRAWIELITZKI, Stefan, SOLLOGOUB, Cyrille, ROLAND, Sébastien, GRANDMONTAGNE, Anne, DOLE, Patrice, JULIEN, Jean-Mario, LORIOT, Catherine, and VINCELOT, Thierry

Subjects
Matériaux [Sciences de l'ingénieur], Materials science, Annealing (metallurgy), Strategy and Management, Polymères [Chimie], multinanolayer, Mechanical properties, mechanical properties, Library and Information Sciences, engineering.material, Poly(ethylene furanoate), gas barrier properties, law.invention, Crystallinity, law, Multilayer, Nano, Crystallization, Nano confinement, nanoconfinement, chemistry.chemical_classification, Multinanolayer, Micro et nanotechnologies/Microélectronique [Sciences de l'ingénieur], multilayer, Gas barrier properties, General Medicine, Polymer, Biodegradable polymer, Amorphous solid, Chemical engineering, chemistry, Poly(Ethylene Furanoate), engineering, Biopolymer, Information Systems
Abstract

online Food packaging films must be reinvented in order to answer the new demanding ecological requirements. Biobased and/or biodegradable polymers appear as an interesting alternative to reduce petroleum dependence and carbon dioxide emissions. Poly(ethylene furanoate) (PEF) appears today as a new promising biopolymer thanks to its good gas barrier and mechanical properties, despite its high price that could limit its industrial applications. Its combination with other polymers is thus of great interest and for the first time, film coextrusion process is used to create PLA-PEF and PET-PEF multi-micro/nano layered films. A new PEF grade developed by AVA Biochem in the H2020 Mypack program, has been used and firstly analysed in terms of melt processability, mechanical, thermal and gas barrier properties. Our major results confirmed the good gas barrier as well as mechanical properties of amorphous PEF. Post-extrusion PEF bulk thermal crystallization led to very brittle material making gas barrier measurements impossible. Micro/nanolayered PLA-PEF and PET-PEF films with different PEF layer thicknesses have been processed and post-extrusion annealing treatment was carried out. The relationship between crystallinity, mechanical and gas barrier properties will be investigated. Projet européen Mypack

Published
2021
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36. Chronic wound healing: A specific antibiofilm protein-asymmetric release system

Author

Bou Haidar, Naila, Dé, Emmanuelle, Schaumann, Annick, Barreau, Magalie, Feuilloley, Marc G.J., Duncan, Anthony, MESSIN, Tiphaine, Marais, Stéphane, Follain, Nadège, GUINAULT, Alain, GAUCHER, Valérie, Delpouve, Nicolas, Sollogoub, Cyrille, Polymères Biopolymères Surfaces (PBS), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA), Laboratoire de Microbiologie Signaux et Microenvironnement (LMSM), Normandie Université (NU)-Normandie Université (NU), Procédés et Ingénierie en Mécanique et Matériaux [Paris] (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA), Groupe de physique des matériaux (GPM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), and Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centrale Lille Institut (CLIL)

Subjects
Materials science, Glycoside Hydrolases, Biocompatibility, Cell Survival, Adipates, Biocompatible Materials, Bioengineering, 02 engineering and technology, Polyethylene glycol, [SDV.BC]Life Sciences [q-bio]/Cellular Biology, 010402 general chemistry, 01 natural sciences, Cell Line, Polyethylene Glycols, Biomaterials, chemistry.chemical_compound, Bacterial Proteins, Staphylococcus epidermidis, Animals, Humans, Dispersin B, ComputingMilieux_MISCELLANEOUS, Wound Healing, Membrane structure, Biofilm, Povidone, Membranes, Artificial, Serum Albumin, Bovine, Succinates, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Bandages, Nanostructures, 0104 chemical sciences, Membrane, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Mechanics of Materials, Biofilms, Drug delivery, Biophysics, Cattle, [SDV.IB]Life Sciences [q-bio]/Bioengineering, 0210 nano-technology, Porosity, Protein adsorption
Abstract

Chronic infection is a major cause of delayed wound-healing. It is recognized to be associated with infectious bacterial communities called biofilms. Currently used conventional antibiotics alone often reveal themselves ineffective, since they do not specifically target the wound biofilm. Here, we report a new conceptual tool aimed at overcoming this drawback: an antibiofilm drug delivery system targeting the bacterial biofilm as a whole, by inhibiting its formation and/or disrupting it once it is formed. The system consists of a micro/nanostructured poly(butylene-succinate-co-adipate) (PBSA)-based asymmetric membrane (AM) with controlled porosity. By the incorporation of hydrophilic porogen agents, polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG), we were able to obtain AMs with high levels of porosity, exhibiting interconnections between pores. The PBSA-PEG membrane presented a dense upper layer with pores small enough to block bacteria penetration. Upon using such porogen agents, under dry and wet conditions, membrane's integrity and mechanical properties were maintained. Using bovine serum albumin (BSA) as a model protein, we demonstrated that protein loading and release from PBSA membranes were affected by the membrane structure (porosity) and the presence of residual porogen. Furthermore, the release curve profile consisted of a fast initial slope followed by a second slow phase approaching a plateau within 24 h. This can be highly beneficial for the promotion of wound healing. Cross-sectional confocal laser scanning microscopy (CLSM) images revealed a heterogeneous distribution of fluorescein isothiocyanate (FITC) labeled BSA throughout the entire membrane. PBSA membranes were loaded with dispersin B (DB), a specific antibiofilm matrix enzyme. Studies using a Staphylococcus epidermidis model, indicate significant efficiency in both inhibiting or dispersing preformed biofilm (up to 80 % eradication). The asymmetric PBSA membrane prepared with the PVP porogen (PBSA-PVP) displayed highest antibiofilm activity. Moreover, in vitro cytotoxicity assays using HaCaT and reconstructed human epidermis (RHE) models revealed that unloaded and DB-loaded PBSA-PVP membranes had excellent biocompatibility suitable for wound dressing applications.

Published
2020
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42. Effect of confinement of PLA on barrier properties

Author

Domenek, Sandra, Delpouve, Nicolas, Nassar, Samira, Guinault, Alain, Stoclet, Gregory, Sollogoub, Cyrille, AgroParisTech, Paris-Saclay Food and Bioproduct Engineering (SayFood), AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Ecole Nationale Supérieure d'Arts et Métiers (Arts et Métiers ParisTech) (ENSAM), Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Propriétés et architectures des alliages et mélanges (P2AM), and HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Conservatoire National des Arts et Métiers [CNAM] (CNAM)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers, [CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; Polylactide (PLA) is biodegradable and biobased glassy polyester with satisfying mechanical properties. One of its main applications is food packaging and catering. To increase the spectrum of applicability, the barrier properties of PLA need to be improved. The impact of polymer microstructure and dynamics of amorphous fractions on the barrier properties of glassy and semicrystalline polymers is not completely understood and quantified today.In that aim, different types of PLA microstructure were created in the aim to confine the amorphous phase between crystalline lamellae or between layers of auxiliary polymers by multi-nanolayer co-extrusion. The use of those two confinement techniques allowed the engineering of the interfaces between amorphous PLA and rigid surfaces, affording changes in coupling between both phases (1,2).We could show that the coupling of the amorphous phase with the crystalline phase governed the barrier properties. Decoupling of phases allows increasing oxygen barrier properties by a factor of 6. The same result was obtained, when PLA was crystallized in a confined space between auxiliary polymer layers. The confined crystallization induced also decoupling of crystalline and amorphous phases and increased oxygen barrier properties. These results help to formulate recommendations for the processing of PLA in the aim to increase its barrier properties.

Published
2019

44. Development of nanocellulose-based high gas barrier composites for packaging

Author

Faraj, Hajar, Domenek, Sandra, Sollogoub, Cyrille, Guinault, Alain, and Domenek, Sandra

Subjects
[CHIM.POLY] Chemical Sciences/Polymers, [CHIM.MATE] Chemical Sciences/Material chemistry
Abstract

Polylactic Acid (PLA) is a bio-degradable, thermoplastic polyester with overall good mechanical properties, which makes it an interesting and reliable substitute for the classical non-renewable polymers. However, PLA’s barrier properties are often limited, resulting in an inadequacy for prolonged food packaging requirements. This property shortage generally requires an additional reinforcement to the polymeric matrix. The aim of this work was to increase those barrier performances by introducing a bio-based filler (Cellulose Nanocrystals) to the polymeric matrix. In this work, we targeted two modification routes: chemical and physical surface modifications to enhance the compatibility between the filler and the matrix. For the chemical modification and for the sake of comparison, two acids were used as compatibilizers (via esterification): a short (Pentanoic) and a medium chain fatty acid (Lauric). The necessary conditions required to obtain the composites (by both solvent and melt routes) are presented, allowing high reproducibility from sample to sample. The effect of unmodified and modified nanocellulose particles on the overall properties of PLA have also been investigated; the adhesion between the matrix and the filler was enhanced after the modification, especially for the Lauric Acid-modified CNCs, as well as the barrier properties.

Published
2019

45. Nanocellulose-based composites: surface modification, processing and properties

Author

Faraj, Hajar, Follain, Nadège, Almeida, Giana, Guinault, Alain, Gervais, Mathieu, Sollogoub, Cyrille, Domenek, Sandra, and Domenek, Sandra

Subjects
[CHIM.POLY] Chemical Sciences/Polymers
Abstract

Polylactide (PLA) presents the advantage of being a biodegradable and renewable polyester with overall good mechanical properties, which makes it an interesting and reliable substitute for the classical non-renewable polymers. However, PLA has poor gas barrier properties , that are crucial in packaging applications. The aim of this work was to increase those barrier perofmance by introducing a bio-based filler to the polymeric matrix. Among the great variety of bio-based fillers, cellulose nanocrystals (CNC) feature high crystallinity and cylindrical shape, which induces the ability to form percolation networks in polymeric systems. Those networks have been proven to be both beneficial for barrier and mechanical properties. However, the achievement of a properly dispersed composite is a challenging task, especially when incorporating hydrophilic particles into a hydrophobic system. Previous research demonstrated the effect of chemical modification of particles on the enhancement of matrix-filler compatibility. Here, we compare This work compares two different approaches to form the nanocellulose-based composites, via solvent casting method and batch mixer. Two chemical modifications via esterification, using a low molecular weight carboxylic acid (Pentanoic) and a medium chain fatty acid (Lauric) as compatiblizers are used. The necessary conditions required to obtain the composites are presented, allowing high reproducibility from sample to sample. The effect of unmodified and modified nanocellulose particles on the overall properties of PLA have also been investigated.

Published
2019

46. Amélioration des propriétés barrières de polyesters par le procédé de coextrusion multi-nanocouches

Author

MESSIN, Tiphaine, GUINAULT, Alain, Sollogoub, Cyrille, GAUCHER, Valérie, DELPOUVE, Nicolas, Follain, Nadège, Marais, Stéphane, Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université de Lille-Ecole Nationale Supérieure de Chimie de Lille (ENSCL)-Institut National de la Recherche Agronomique (INRA)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers, [CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

National audience

Published
2018

47. How reproducible are methods to measure the dynamic viscoelastic properties of poroelastic media?

Author

VERDIERE, K., BERTOLINI, C, BÄR, R., GROBY, J.-P., GESLAIN, A., POULAIN, N, GUINAULT, Alain, ROULEAU, M., AHMADI, Hamid, FORGE, C., BONFIGLIO, P., POMPOLI, F.B, HOROSHENKOV, Kv, RAHIM, M.I.B.S.A., JAOUEN, L.c, RODENAS, J.c, BÉCOT, F.-X, GOURDON, E., JAEGER, D., KURSCH, V, TARELLO, M., ROOZEN, N.B, GLORIEUX, C., FERRIAN, F, LEROY, P., VANGOSA, F.B., DAUCHEZ, N., FOUCART, F., LEI, L., CARILLO, K., DOUTRES, O., SGARD, F., PANNETON, R., University of Ferrara [Ferrara], University of Sheffield [Sheffield], Chercheur indépendant, École Nationale des Travaux Publics de l'État (ENTPE), Ministère de l'Ecologie, du Développement Durable, des Transports et du Logement-École Nationale des Travaux Publics de l'État (ENTPE), Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Roberval (Roberval), Université de Technologie de Compiègne (UTC), LAboratoire des Sciences de l'Habitat (DGCB-LASH), École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS), Département de génie mécanique [Sherbrooke], Université de Sherbrooke [Sherbrooke], Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Département de Recherche en Ingénierie des Véhicules pour l'Environnement [Nevers] (DRIVE), Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Centre de Transfert de Technologie du Mans (CTTM), Le Mans Université (UM), Laboratoire de Mécanique des Structures et des Systèmes Couplés (LMSSC), Conservatoire National des Arts et Métiers [CNAM] (CNAM), Procédés et Ingénierie en Mécanique et Matériaux [Paris] (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Centre National de la Recherche Scientifique (CNRS), École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Conservatoire National des Arts et Métiers [CNAM] (CNAM), Università degli Studi di Ferrara (UniFE), École Nationale des Travaux Publics de l'État (ENTPE)-Ministère de l'Ecologie, du Développement Durable, des Transports et du Logement, Département de génie mécanique [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université de Bourgogne (UB), Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, and HESAM Université (HESAM)-HESAM Université (HESAM)

Subjects
Interlaboratory tests, Viscoelastic materials, Acoustics and Ultrasonics, Computer science, Loss factor, Acoustics, Poromechanics, Measure (physics), FOS: Physical sciences, Modulus, Applied Physics (physics.app-ph), Physics - Classical Physics, 02 engineering and technology, Condensed Matter - Soft Condensed Matter, Sciences de l'ingénieur, 01 natural sciences, Viscoelasticity, NO, symbols.namesake, [SPI]Engineering Sciences [physics], Interlaboratory tests, 0103 physical sciences, 010301 acoustics, Viscoelastic materials, Mechanical Engineering, Classical Physics (physics.class-ph), Physics - Applied Physics, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Strength of materials, Poisson's ratio, Mechanics of Materials, symbols, Soft Condensed Matter (cond-mat.soft), 0210 nano-technology, Porous medium
Abstract

International audience; There is a considerable number of research publications on the acoustical properties of porous media with an elastic frame. A simple search through the Web of Science™ (last accessed 21 March 2018) suggests that there are at least 819 publications which deal with the acoustics of poroelastic media. A majority of these researches require accurate knowledge of the elastic properties over a broad frequency range. However, the accuracy of the measurement of the dynamic elastic properties of poroelastic media has been a contentious issue. The novelty of this paper is that it studies the reproducibility of some popular experimental methods which are used routinely to measure the key elastic properties such as the dynamic Young's modulus, loss factor and Poisson ratio of poroelastic media. In this paper, fourteen independent sets of laboratory measurements were performed on specimens of the same porous materials. The results from these measurements suggest that the reproducibility of this type of experimental method is poor. This work can be helpful to suggest improvements which can be developed to harmonize the way the elastic properties of poroelastic media are measured worldwide.

Published
2018
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48. Improvement of gas barrier properties of polylactic acid (pla) by layer multiplying co-extrusion

Author

Nassar, Samira Fernandes, Guinault, Alain, Sollogoub, Cyrille, Delpouve, Nicolas, Stoclet, Gregory, Miquelard-Garnier, Guillaume, Messin, Tiphaine, Domenek, Sandra, Follain, Nadège, Marais, Stéphane, Laboratoire Procédés et Ingénierie en Mécanique et Matériaux (PIMM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Groupe de physique des matériaux (GPM), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Unité Matériaux et Transformations - UMR 8207 (UMET), Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Polymères Biopolymères Surfaces (PBS), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Ingénierie, Procédés, Aliments (GENIAL), and Institut National de la Recherche Agronomique (INRA)-AgroParisTech

Subjects
[SPI]Engineering Sciences [physics]
Abstract

International audience; The development of biopolymers for food-packaging applications implies ecofriendly character to specific industrial requirements as low-cost and good mechanical, thermal and barrier properties. Polylactide (PLA) has exhibited promising applicability in the past decades due to its performance in renewability, melt processing and mechanical properties [1]. As one of the major challenges to consider producing high performance PLA packaging at a large scale lies in the improvement of its gas barrier properties, the tailoring of the PLA microstructure from thermal crystallization [2,3] and drawing [4] has been strongly investigated in the recent years as the polymer blends route by blending PLA with biobased or biodegradable polymers as for example PHB, PCL, PBS, PBSA, etc ... . New strategies are currently studied to obtained stronger effects. One of them consists in the geometrical confinement of the polymers at the molecular scale using the original layer-multiplying co-extrusion process to create nanometric thickness layers. This technology is environmentally friendly and health secured and has already proved its efficiency to improve the gas barrier properties for other polymers [5] by the way of an improved crystallization. In this work we propose to design multi-layer coextruded based PLA films to analyse the ability of PLA and PBS and PBSA to crystallise under confinement and its effect on the final gas barrier properties. It has been shown that geometrical confinement acts differently on the formation of a rigid amorphous fraction (RAF) for both PLA and PBSA by creating or slowing its formation. Finally it was shown that PLA exhibits better gas barrier properties by slowing the less impermeable RAF formation while PBSA exhibits also better gas barrier properties by increasing its more impermeable RAF phase.(1) Auras, R.; Harte, B.; Selke, S. Macromol. Biosci. 2004, 4, 835–864.(2) Guinault, A.; Sollogoub, C.; Ducruet, V.; Domenek, S. Eur. Polym. J. 2012, 48, 779–788.(3) Cocca, M.; Lorenzo, M. L. D.; Malinconico, M.; Frezza, V. Eur. Polym. J. 2011, 47, 1073–1080.(4) Delpouve, N.; Stoclet, G.; Saiter, A.; Dargent, E.; Marais, S. J. Phys. Chem. B 2012, 116, 4615–4625.(5) Carr, J. M.; Mackey, M.; Flandin, L.; Hiltner, A.; Baer, E. Polymer 2013, 54, 1679–1690.

Published
2018

50. Cooperativity Scaling and Free Volume in Plasticized Polylactide

Author

Araujo, Steven, primary, Delpouve, Nicolas, additional, Domenek, Sandra, additional, Guinault, Alain, additional, Golovchak, Roman, additional, Szatanik, Roman, additional, Ingram, Adam, additional, Fauchard, Cyrille, additional, Delbreilh, Laurent, additional, and Dargent, Eric, additional

Published
2019
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