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Thermomechanical Behaviour of Biodegradable Shape-memory Polymer Foams

Published online by Cambridge University Press:  31 January 2011

Samy A Madbouly ,
Karl Kratz ,
Frank Klein ,
Karola Lüetzow  and
Andreas Lendlein
Samy A Madbouly
Affiliation:
samy.madbouly@gkss.de, Centre for Biomedical Development, Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH,, Teltow, Germany
Karl Kratz
Affiliation:
karl.kratz@gkss.de, Centre for Biomedical Development, Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH,, Teltow, Germany
Frank Klein
Affiliation:
frank.klein@gkss.de, Centre for Biomedical Development, Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH,, Teltow, Germany
Karola Lüetzow
Affiliation:
Karola.luetzow@gkss.de, Centre for Biomedical Development, Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH,, Teltow, Germany
Andreas Lendlein
Affiliation:
lendlein@online.de, Centre for Biomedical Development, Institute of Polymer Research, GKSS Research Centre Geesthacht GmbH,, Teltow, Germany
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Abstract

Shape-memory polymer foams based on poly(ω-pentadecalactone) (PPDL) and poly(ε-caprolactone) (PCL) multiblock copolymer with 60 wt% PCL content were prepared by environmentally-friendly high pressure supercritical carbon dioxide scCO2 foaming technique. A foam with a density of approximately 0.11 ± 0.02 g/cm3 and an average pore size of 150-200 μm with excellent compressibility and shape-memory properties was created at 25 bar/s depressurization rate in the temperature range between 78 and 84 °C. The shape-memory behavior of this foam was investigated using different programming modules, such as, under stress-free condition and under constant strain condition. The thermally-induced shape-memory effect (SME) was found to be strongly dependent on the programming conditions. Excellent shape fixity has been observed for all foams indicating the high efficiency of the switching domains to fix the temporary shape by crystallization. The stress recovery of this foam could be controlled by changing compression percentage (εc%) at a constant compression temperature. The production of these foams with unprecedented properties by commercially available processing equipment raises much hope with the potential to provide new materials with a unique combination of shape-memory properties and porous structure as well as desired properties for many industrial and biomedical applications

Keywords

foampolymerporosity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1190: Symposium NN – Active Polymers , 2009 , 1190-NN04-04
Copyright
Copyright © Materials Research Society 2009

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