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Your search keyword '"Nouvel, Cecile"' showing total 18 results
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18 results on '"Nouvel, Cecile"'

1. Multi-material distributed recycling via material extrusion: recycled high density polyethylene and poly (ethylene terephthalate) mixture

Author

Gonzalez, Catalina Suescun, Sanchez, Fabio A. Cruz, Boudaoud, Hakim, Nouvel, Cecile, and Pearce, Joshua M.

Subjects
Memory (Computers) -- Waste management, 3D printing, Beverage industry -- Waste management, Plastic scrap -- Waste management, Ethylene -- Waste management, Polyethylene terephthalate -- Waste management, Recycling industry -- Waste management, Manufacturing costs, Semiconductor memory, Engineering and manufacturing industries, Science and technology
Abstract

The high volume of plastic waste and the extremely low recycling rate have created a serious challenge worldwide. Local distributed recycling and additive manufacturing (DRAM) offers a solution by economically incentivizing local recycling. One DRAM technology capable of processing large quantities of plastic waste is fused granular fabrication, where solid shredded plastic waste can be reused directly as 3D printing feedstock. This study presents an experimental assessment of multimaterial recycling printability using two of the most common thermoplastics in the beverage industry, polyethylene terephthalate (PET) and high-density polyethylene (HDPE), and the feasibility of mixing PET and HDPE to be used as a feedstock material for large-scale 3-D printing. After the material collection, shredding, and cleaning, the characterization and optimization of parameters for 3D printing were performed. Results showed the feasibility of printing a large object from rPET/ rHDPE flakes, reducing production costs by up to 88%. Highlights * Study: multi-material recycling printability of PET-HDPE. * Large-scale fused particle-based 3-D printing technically possible. * Direct waste 3-D printing rPET/rHDPE flakes, reducing production costs up to 88%. KEYWORDS 3-D printing, additive manufacturing, distributed recycling, HDPE, PET, recycling, 1 | INTRODUCTION The disposal of plastic waste is one of the most challenging current environmental concerns given its systemic complexity. (1) The mass of micro-/meso-plastics in the oceans is [...]

Published
2024
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15. PMMA-grafted dextran glycopolymers by atom transfer radical polymerization

Author

Six, J.L., Dupayage, Ludovic, Save, Maud, Dellacherie, Edith, Nouvel, Cecile, SIX, Jean-Luc, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique Macromoléculaire (LCPM), and Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Polymers and Plastics, Chemistry, Atom-transfer radical-polymerization, Organic Chemistry, Radical polymerization, Solution polymerization, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Dextran, [CHIM.POLY]Chemical Sciences/Polymers, Polymerization, Amphiphile, Polymer chemistry, Materials Chemistry, Copolymer, Methyl methacrylate, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

The four-step synthesis of amphiphilic glycopolymers associating dextran as backbone and poly(methyl methacrylate) (PMMA) as grafts is reported, using the “grafting from” strategy. In the first step, the dextran OH functions were partially acetylated. The second step consisted in linking initiator groups by reaction of 2-bromoisobutyryl bromide (BiBB) with the unprotected OH functions. Third, the atom transfer radical polymerization (ATRP) of methyl methacrylate was carried out in DMSO from the resulting dextran derivative used as a macroinitiator. Finally, the cleavage of the acetate groups led to the expected glycopolymers. Careful attention was given both to the copolymer structure and the control of polymerization. PMMA grafts were analyzed by SEC-MALLS after their deliberate cleavage from the backbone to evidence a controlled polymerization. Moreover, the mildness of the final deprotection conditions was proved to ensure acetate cleavage without either degrading dextran backbone and PMMA grafts or cleaving grafts from dextran backbone. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7606–7620, 2008

Published
2008

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