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Title: Modeling the morphology and mechanical behavior of shape memory polyurethanes based on solid-state NMR and synchrotron SAXS/WAXD
Authors: D'hollander, Stijn
Gommes, Cedric Joseph
Mens, Raoul
Adriaensens, Peter
Goderis, Bart ×
Du Prez, Filip #
Issue Date: 2010
Publisher: Royal Society of Chemistry
Series Title: Journal of Materials Chemistry vol:20 issue:17 pages:3475-3486
Abstract: A combination of solid-state proton Wide-line Nuclear Magnetic Resonance (NMR) relaxometry and synchrotron Small-angle (SAXS) and Wide-angle (WAXD) X-ray scattering was used to elucidate the microphase morphology of shape memory thermoplastic multi-block polyurethanes based on poly(epsilon-caprolactone), as switching segment and polyurethane based permanent or hard segments (HS). The polyurethanes are produced from the condensation of 1,4-butanediol (BDO) with hexamethylenediisocyanate (HDI). The morphology - induced by the hard-segment crystallization - converts from dispersed randomly placed hard-segment domains into progressively more periodic, but interconnected HS nanophases with increasing HS content. Irrespective of the actual morphology, the SAXS data could be described satisfactorily by using a clipped Gaussian random field (GRF) model. The NMR data demonstrate that the HS domain fraction corresponds to the chemical feed, pointing at a complete phase separation. The material mechanical behavior during repeated deformation cycles can be explained on morphological grounds and involves a spatially heterogeneous plastic deformation of the hard domains.
ISSN: 0959-9428
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Polymer Chemistry and Materials
× corresponding author
# (joint) last author

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