Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 17, Pages 3475-3486Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b923734h
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Funding
- IWT (The Institute for the Promotion of Innovation through Science and Technology in Flanders, Belgium)
- F.R.S.-FNRS (Fonds de la Recherche Scientifique, Belgium)
- DUBBLE
- Belgian State, Prime Minister's office [P6/27]
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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.
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