Reference : Modeling the morphology and mechanical behavior of shape memory polyurethanes based o...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physical, chemical, mathematical & earth Sciences : Chemistry
Modeling the morphology and mechanical behavior of shape memory polyurethanes based on solid-state NMR and synchrotron SAXS/WAXD
D'Hollander, Stijn [Universiteit Gent - Ugent > > > >]
Gommes, Cédric mailto [Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique >]
Mens, Raoul [Universiteit Hasselt > > > >]
Adriaensens, Peter [ > > ]
Goderis, Bart [Katholieke Universiteit Leuven - KUL > > > >]
Du Prez, Filip [ > > ]
Journal of Materials Chemistry
Royal Society of Chemistry
Yes (verified by ORBi)
United Kingdom
[en] Shape memory materials ; SAXS ; WAXS ; NMR
[en] 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(3-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.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals ; Students

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