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Fast switchable, epoxy based shape-memory polymers with high strength and toughness

: Arnebold, Andre; Hartwig, Andreas


Polymer 83 (2016), pp.40-49
ISSN: 0032-3861
Journal Article
Fraunhofer IFAM ()

A fast switchable, epoxy based shape-memory polymer is presented. For this, a partially crystalline epoxy resin was formed by cationic polymerization in the presence of a high meltable polyester polyol, namely poly(ω-pentadecalactone) (PPDL). Under certain polymerization conditions, this system generates a high degree of crystallinity compared to the respective poly(ɛ-caprolactone) (PCL) counterpart. Thus, such an epoxy/PPDL composite exhibits very fast shape-fixity and a good shape-memory cycle stability. Furthermore, the formation of a heterogeneous morphology by segregation and crystallization leads to enhanced strength and toughness compared to the respective epoxy/PCL composites.