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Issue 13, 2011
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Star-shaped POSS-polycaprolactone polyurethanes and their shape memory performance

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Abstract

Star-shaped polyhedral oligomeric silsesquioxane (SPOSS)-based multi-arm poly(ε-caprolactones) (PCLs) with various arm lengths were synthesized by ring opening polymerization of ε-caprolactone. Increasing the PCL arm lengths was observed to increase the melting temperature and also the melt crystallization temperature in SPOSS-PCLs. Star-shaped POSS-PCL polyurethanes (SPOSS-PUs) were then prepared by cross-linking SPOSS-PCLs with hexamethylene diisocyanate (HMDI) and their shape memory (SM) behaviour was determined. For this purpose two cyclic thermo-mechanical testing concepts with similar programming (deformation and shape fixing) but different recovery strategies (free strain versus fixed-strain constrained stress recovery) were used and the synthesized polymers were systematically investigated around the crystallization and melting temperatures of PCL. SPOSS-PU with the highest POSS content exhibited remarkable cycles-averaged (N = 2–5) shape fixities and strain recoverabilities of 98% and stress recoverabilities close to 100%. The main structural factors that were expected to reduce the SM performances with increasing PCL arm lengths were a lowering of cross-link density (content of octasubstituted POSS) and an increase in chain flexibility/molecular mobility.

Graphical abstract: Star-shaped POSS-polycaprolactone polyurethanes and their shape memory performance

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Supplementary files

Article information


Submitted
20 Dec 2010
Accepted
25 Jan 2011
First published
21 Feb 2011

J. Mater. Chem., 2011,21, 4827-4836
Article type
Paper

Star-shaped POSS-polycaprolactone polyurethanes and their shape memory performance

K. Y. Mya, H. B. Gose, T. Pretsch, M. Bothe and C. He, J. Mater. Chem., 2011, 21, 4827
DOI: 10.1039/C0JM04459H

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