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Development of photo- or thermo-reversible cross-linked recyclable shape-memory materials
Defize, Thomas; Riva, Raphaël; Thomassin, Jean-Michel et al.
2015International Symposium on Amphiphilic Polymers, Networks, Gels and Membranes (APNGM)
 

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Keywords :
shape-memory; Diels Alder reaction; ring-opening polymerization (ROP); nertwork; polyester
Abstract :
[en] Shape-memory polymers (SMPs) are remarkable materials able to switch from a stressed deformed state (temporary shape) to their initial relaxed state (permanent shape) by the application of a stimulus, such as heat or light. Typically, the shape-memory property is generally observed for chemically or physically cross-linked polymers that exhibit an elastomeric behavior above a phase transition, e.g. glass or melting transition. As an example, cross-linked semi-crystalline poly(ε-caprolactone) (PCL) is widely studied for the development of SMPs. As most of SMPs are irreversibly cross-linked material, their reprocessing is impossible preventing any recycling. Thereby, reversible reactions, allowing the formation/cleavage of the network, raise tremendous interest for the development of new SMPs. Recently, we reported the preparation reversibly cross-linked PCL-based SMP using the Diels-Alder (DA) reaction between furan and maleimide end-groups of 4-arm star-shaped PCL, well-known to create reversible bonds. After implementation, this shape-memory material was demonstrated to be recyclable, and was characterized by excellent fixity and recovery before and after recycling experiments. However, the relatively low retro DA temperature of the furan-maleimide adducts led to an inelastic deformation during shape-memory tensile cycles. In order to get rid of this drawback, an alternative approach was investigated. The substitution of the DA reaction by a photo-reversible reaction, typically the photo-induced (2+2) cycloaddition of coumarins, was proposed to prepare cross-linked PCL matrix presenting one-way and two-way memory properties, since photolabile adducts are supposed to be stable during shape-memory tensile cycles.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Defize, Thomas ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Riva, Raphaël ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Thomassin, Jean-Michel ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Alexandre, Michaël;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Jérôme, Christine  ;  University of Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Language :
English
Title :
Development of photo- or thermo-reversible cross-linked recyclable shape-memory materials
Publication date :
01 September 2015
Event name :
International Symposium on Amphiphilic Polymers, Networks, Gels and Membranes (APNGM)
Event place :
Budapest, Hungary
Event date :
30/08/2015 - 2/09/2015
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Commentary :
This oral communication was presented by Thomas Defize
Available on ORBi :
since 18 September 2015

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