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2. Fast polymerization at low temperature of an infrared radiation cured epoxy-amine adhesive

Author

Genty, Sébastien, Tingaut, Philippe, and Aufray, Maëlenn

Subjects
Condensed Matter - Materials Science, Physics - Chemical Physics
Abstract

In the industry, the cure time of two-component adhesives is very important for a cost-effective manufacturing. Too fast, it does not favor the application of the product and the control of bonded joints. Too slow, it leads to long process times and too high process costs. The best compromises are two-component adhesives that cure slowly at room temperature and can reach full polymerization in minutes, on demand. In this paper, the curing behavior of a model poly-epoxide adhesive (a stoichiometric mixture of a pure epoxy and amine) polymerized with infrared radiation will be studied. The kinetic follow-up of this polymerization will be carried out by thermal analysis (determination of the residual heat peak by Differential Scanning Calorimetry-DSC). This study paves the way to a cold and universal cure-on-demand process, which means achieved in few minutes at low temperature without any initiators, catalysts or accelerators. Basically, infrared curing can be possible thanks to an increase in temperature (called thermal effect). But it has been shown that a "non-thermal effect" could also be involved in accelerating kinetics with infrared. This increase due to a non-thermal effect, suggested as a function of the infrared radiative flux, has been shown to be possible thanks to the absorption of infrared radiation, leading to a reduction in the energy barrier of the primary epoxy/amine reaction., Comment: * Submitted to Thermochemica Acta (January 2018) * Partly presented in the JADH 2017 * Partly presented in the European Polymer Federation EPF Lyon 2017 * To be presented in the WCARP 2018

Published
2018

29. Inside Cover: Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin (Angew. Chem. Int. Ed. 48/2015)

Author

Zhao, Shanyu, primary, Malfait, Wim J., additional, Demilecamps, Arnaud, additional, Zhang, Yucheng, additional, Brunner, Samuel, additional, Huber, Lukas, additional, Tingaut, Philippe, additional, Rigacci, Arnaud, additional, Budtova, Tatiana, additional, and Koebel, Matthias M., additional

Published
2015
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39. Acetylation Of Cellulose Nanowhiskers With Vinyl Acetate Under Moderate Conditions

Author

Cetin, Nihat Sami, Tingaut, Philippe, Özmen, Nilguel, Henry, Nathan, Harper, David, Dadmun, Mark, Sèbe, Gilles, Kahramanmaras Sutcu Imam Univ, Swiss Federal Laboratories for Materials Science and Technology [Dübendorf] (EMPA), Dept Chem, UnivTennessee, The University of Tennessee [Knoxville], Tennessee Forest Prod Ctr, Laboratoire de Chimie des Polymères Organiques (LCPO), Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC), Team 2 LCPO : Biopolymers & Bio-sourced Polymers, and Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Ecole Nationale Supérieure de Chimie, de Biologie et de Physique (ENSCBP)-Université de Bordeaux (UB)-Institut de Chimie du CNRS (INC)

Subjects
[CHIM.POLY]Chemical Sciences/Polymers, FT-IR ATR spectroscopy, vinyl acetate, cellulose nanowhiskers, atomic force microscopy (AFM), (13)C CP-MAS NMR spectroscopy, wide-angle X-ray analysis, acetylation
Abstract

International audience; A novel and straightforward method for the surface acetylation of cellulose nanowhiskers by transesterification of vinyl acetate is proposed. The reaction of vinyl acetate with the hydroxyl groups of cellulose nanowhiskers obtained from cotton linters was examined with potassium carbonate as catalyst. Results indicate that during the first stage of the reaction, only the surface of the nanowhiskers was modified, while their dimensions and crystallinity remained unchanged. With increasing reaction time, diffusion mechanisms controlled the rate, leading to nanowhiskers with higher levels of acetylation, smaller dimensions, and lower crystallinity. In THF, a solvent of low polarity, the suspensions from modified nanowhiskers showed improved stability with increased acetylation.

Published
2009

45. Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin.

Author

Shanyu Zhao, Malfait, Wim J., Brunner, Samuel, Huber, Lukas, Koebel, Matthias M., Demilecamps, Arnaud, Budtova, Tatiana, Yucheng Zhang, Tingaut, Philippe, and Rigacci, Arnaud

Subjects
AEROGELS, SILICIC acid, PECTIC enzymes, INORGANIC acids, SILICA
Abstract

Silica aerogels are excellent thermal insulators, but their brittle nature has prevented widespread application. To overcome these mechanical limitations, silica–biopolymer hybrids are a promising alternative. A one-pot process to monolithic, superinsulating pectin–silica hybrid aerogels is presented. Their structural and physical properties can be tuned by adjusting the gelation pH and pectin concentration. Hybrid aerogels made at pH 1.5 exhibit minimal dust release and vastly improved mechanical properties while remaining excellent thermal insulators. The change in the mechanical properties is directly linked to the observed “neck-free” nanoscale network structure with thicker struts. Such a design is superior to “neck-limited”, classical inorganic aerogels. This new class of materials opens up new perspectives for novel silica–biopolymer nanocomposite aerogels. [ABSTRACT FROM AUTHOR]

Published
2015
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