Use of reversible covalent and non-covalent bonds in new recyclable and reprocessable polymer materials.

Abstract : Incorporating reversible bonds in polymer materials is an attractive method for obtaining crosslinked networks, that can still be reshaped or recycled after use. In the scope of this thesis, we synthesized and studied polymer networks maintained through two distinct types of reversible bonds: non-covalent hydrogen bonds and covalent ester bonds able to be exchanged through trans-esterification reactions. In a first section we report the synthesis of different types of supramolecular polymers from fatty acid derivatives, epoxy resins and polyethers. These polymers are modified with a supramolecular moiety (imidazolidone) able to strongly self-associate through multiple hydrogen bonding. Some of these polymers display the surprising ability to self-heal when broken parts are put in contact for a few minutes. A rheological study is carried out in order to characterize the effect of supramolecular groups on the mechanical properties of the materials. In a second section we study epoxy-based materials. Such materials are known to be irreversibly crosslinked after cured. However, when modified in order to allow for some exchanges of ester bonds, the materials can be ground then extruded, or thermoformed even after complete curing.
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Submitted on : Friday, May 4, 2012 - 10:11:47 AM
Last modification on : Thursday, July 4, 2019 - 11:00:05 AM
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Damien Montarnal. Use of reversible covalent and non-covalent bonds in new recyclable and reprocessable polymer materials.. Polymers. Université Pierre et Marie Curie - Paris VI, 2011. English. ⟨pastel-00694348⟩

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