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Comparison of memory effects in multiblock copolymers and covalently crosslinked multiphase polymer networks composed of the same types of oligoester segments and urethane linker

Published online by Cambridge University Press:  25 June 2013

Li Wang ,
Ulrich Nöchel ,
Marc Behl ,
Karl Kratz  and
Andreas Lendlein
Li Wang
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, 14513 Teltow, Germany Institute of Chemistry, University Potsdam, 14476 Potsdam, Germany
Ulrich Nöchel
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, 14513 Teltow, Germany
Marc Behl
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, 14513 Teltow, Germany
Karl Kratz
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, 14513 Teltow, Germany
Andreas Lendlein*
Affiliation:
Institute of Biomaterial Science and Berlin-Brandenburg Centre for Regenerative Therapies (BCRT), Helmholtz-Zentrum Geesthacht, 14513 Teltow, Germany Institute of Chemistry, University Potsdam, 14476 Potsdam, Germany
*
*Corresponding Author: andreas.lendlein@hzg.de
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Abstract

Phase-segregated multiblock copolymers (MBC) as well as covalently crosslinked multiphase polymer networks, which are composed of crystallizable oligo(ε-caprolactone) (OCL) and oligo(ω-pentadecalactone) (OPDL) segments have been recently introduced as degradable polymer systems exhibiting various memory effects. Both types of copolyesterurethane networks can be synthesized via co-condensation of the respective hydroxytelechelic oligomers and 2,2(4),4-trimethyl-hexamethylene diisocyanate (TMDI) as aliphatic linker.

In this work the dual-shape properties as well as the temperature-memory capability of thermoplastics and covalently crosslinked copolyesterurethanes containing OCL and OPDL domains are explored. Both copolyesterurethane networks exhibited excellent dual-shape properties with high shape fixity ratios Rf ≥ 93% and shape recovery ratios in the range of 92% to 100% determined in the 2nd and 3rd test cycle, whereby the dual-shape performance was substantially improved when covalent crosslinks are present in the copolymer.

A pronounced temperature-memory effect was achieved for thermoplastic as well as crosslinked copolyesterurethanes. Hereby, the switching temperature Tsw could be adjusted via the variation of the applied deformation temperature Tdeform in the range from 32 °C to 53 °C for MBC and in the range from 29 °C to 78 °C for multiphase polymer networks.

Keywords

memorypolymerelastic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1569: Symposium NN – Advanced Materials for Biological and Biomedical Applications , 2013 , pp. 123 - 128
Copyright
Copyright © Materials Research Society 2013 

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References

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