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http://hdl.handle.net/1942/10945
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 SOC CHEMISTRY | Source: | 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. bart.goderis@chem.kuleuven.be; filip.duprez@ugent.be | Document URI: | http://hdl.handle.net/1942/10945 | ISSN: | 0959-9428 | DOI: | 10.1039/b923734h | ISI #: | 000276553300017 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2011 |
Appears in Collections: | Research publications |
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