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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
Du Prez, Filip
|Issue Date: ||2010|
|Publisher: ||ROYAL SOC CHEMISTRY|
|Citation: ||JOURNAL OF MATERIALS CHEMISTRY, 20(17). p. 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.|
|Notes: ||[Gommes, Cedric Joseph; Goderis, Bart] Univ Liege, Dept Chem Engn, B-4000 Liege, Belgium. [D'hollander, Stijn; Du Prez, Filip] Univ Ghent, Dept Organ Chem, Polymer Chem Res Grp, B-9000 Ghent, Belgium. [Gommes, Cedric Joseph] Catholic Univ Leuven KU Leuven, Div Mol & Nanomat, Dept Chem, B-3001 Heverlee, Belgium. [Mens, Raoul; Adriaensens, Peter] Hasselt Univ, Div Chem, Inst Mat Res, IMO, B-3590 Diepenbeek, Belgium.
|ISI #: ||000276553300017|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2011|
|Appears in Collections: ||Research publications|
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