Synthesis and characterization of two shape-memory polymers containing short aramid hard segments and poly(ε{lunate}-caprolactone) soft segments

Gouher Rabani, Heinrich Luftmann, Arno Kraft

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

A number of segmented copolymers were synthesized by reacting 4-aminobenzoyl end-functionalized poly(e{lunate}-caprolactone)s of Mn 2000, 3000 and 4000 g mol-1 with three aromatic diacid dichlorides in the presence of chlorotrimethylsilane. Polymer purity, molar mass, thermal and mechanical properties were characterized by NMR, MALDI-TOF mass spectrometry, GPC, DSC, and DMTA. Promising shape-memory properties were observed for two polymers that contained comparatively short, semicrystalline poly(e{lunate}-caprolactone) soft segments of molecular weight 3000 g mol-1 and either terephthalamide or 2,6-naphthalenedicarboxyamide hard segments. Cast films of these polymers were soft and elastomer-like at room temperature. Loading could be conveniently achieved by cold-drawing at room temperature and strain recovery took place upon heating above the melting temperature of the soft segment (35 °C). Cast films reached uniform deformation properties with strain recovery rates as high as 99% and strain fixity values of 78% after passing through only one or two training cycles. © 2006 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)4251-4260
Number of pages10
JournalPolymer
Volume47
Issue number12
DOIs
Publication statusPublished - 31 May 2006

Keywords

  • Aramid
  • Elastomer
  • Poly(ε{lunate}-caprolactone)

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