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

A number of segmented copolymers were synthesized by reacting 4-aminobenzoyl end-functionalized poly(ε-caprolactone)s of M n 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 wer...

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Bibliographic Details
Published inPolymer (Guilford) Vol. 47; no. 12; pp. 4251 - 4260
Main Authors Rabani, Gouher, Luftmann, Heinrich, Kraft, Arno
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 31.05.2006
Elsevier
Subjects
Applied sciences
Aramid
Elastomer
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Poly(ε-caprolactone)
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
Poly(ε-caprolactone)
Aramid
Elastomer
Segmented polymer
Mechanical properties
Thermoplastic rubber
Condensation polymerization
Tensile property
Poly(E-caprolactone)
Experimental study
Caprolactone copolymer
Dynamic mechanical properties
Shape memory effect
Preparation
Amide copolymer
Hydrogen bond
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Summary:A number of segmented copolymers were synthesized by reacting 4-aminobenzoyl end-functionalized poly(ε-caprolactone)s of M n 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(ε-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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2006.03.106