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Thermoreversibly Crosslinked Poly(ε-caprolactone) as Recyclable Shape-Memory Polymer Network

✍ Scribed by Thomas Defize; Raphaël Riva; Jean-Marie Raquez; Philippe Dubois; Christine Jérôme; Michaël Alexandre

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
254 KB
Volume
32
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A new concept to build shape memory polymers (SMP) combining outstanding fixity and recovery ratios (both above 99% after only one training cycle) typical of chemically crosslinked SMPs with reprocessability restricted to physically crosslinked SMPs is demonstrated by covalently bonding, through thermoreversible Diels–Alder (DA) adducts, star‐shaped poly(ε‐caprolactones) (PCL) end‐functionalized by furan and maleimide moieties. A PCL network is easily prepared by melt‐blending complementary end‐functional star polymers in retro DA regime, then by curing at lower temperature to favour the DA cycloaddition. Such covalent network can be reprocessed when heated again at the retro DA temperature. The resulting SMP shows still excellent shape memory properties attesting for its good recyclability.

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## Abstract Cross‐linked poly(ε‐caprolactone) (PCL)‐based polyesterurethane (PUR) systems have been synthesized through Diels–Alder reactions by reactive extrusion. The Diels–Alder and retro‐Diels–Alder reactions proved to be useful for enhancing the molecular motion of PCL‐based systems, and there