ORBi: D'Hollander Stijn - Modeling the morphology and mechanical behavior of shape memory polyurethanes based on solid-state NMR and synchrotron SAXS/WAXD

Reference : Modeling the morphology and mechanical behavior of shape memory polyurethanes based on s...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/36476

Title :	Modeling the morphology and mechanical behavior of shape memory polyurethanes based on solid-state NMR and synchrotron SAXS/WAXD
Language :	English
Author, co-author :	D'Hollander, Stijn [Universiteit Gent - Ugent > > > >]
	Gommes, Cédric [Université de Liège - ULg > Département de chimie appliquée > Génie chimique - Génie catalytique >]
	Mens, Raoul [Universiteit Hasselt > > > >]
	Adriaensens, Peter [ > > ]
	Goderis, Bart [Katholieke Universiteit Leuven - KUL > > > >]
	Du Prez, Filip [ > > ]
Publication date :	2010
Journal title :	Journal of Materials Chemistry
Publisher :	Royal Society of Chemistry
Volume :	20
Pages :	3475–3486
Peer reviewed :	Yes (verified by ORBi)
Audience :	International
ISSN :	0959-9428
e-ISSN :	1364-5501
City :	Cambridge
Country :	United Kingdom
Keywords :	[en] Shape memory materials ; SAXS ; WAXS ; NMR
Abstract :	[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.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/36476

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