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Molecular Mobility of Soft Segment of Polyurethane Elastomers under Elongation

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Title: Molecular Mobility of Soft Segment of Polyurethane Elastomers under Elongation
Authors: Kojio, Ken / Shimada, Makoto / Motokucho, Suguru / Furukawa, Mutsuhisa / Co, Albert / Leal, Gary L. / Colby, Ralph H. / Giacomin, A. Jeffrey
Issue Date: Jul-2008
Publisher: American Institute of Physics
Citation: AIP Conference Proceedings, 1027, pp.1345-1347; 2008
Abstract: Abstract. In this study, we investigated molecular mobility of a soft segment in the poly(oxypropylene) glycol (PPG), 4,4'-diphenylmethane diisocyanate (MDI) and 1,4-butane diol (BD)-based polyurethane elastomers (PUE) with and without elongation by dynamic viscoelastic property measurement and pulse nuclear magnetic resonance (NMR) measurement. The peak position of the loss tangent (tand) curves shifted to the lower temperature region with increasing elongation. In the pulse NMR measurement, the long spin-spin relaxation time {T2) component appeared at -18.0 (e = 0) and -26.0 °C (e =1.5), respectively, with increasing temperature. Since this temperature seems to be related to the glass transition temperature (Jg) of the soft segment in the PUE, it is likely to consider that the Tg decreased with increasing strain. These results might be attributed that the size of cooperative motion during the glass transition decrease due to the orientation of the soft segment, and the soft segment phase approach to a pure phase on account of the extraction of the hard segment from the soft segment phase.
Description: THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting : Monterey (California), 3–8 August 2008
Keywords: Polyurethane / Glass Transition Temperature / Elongation
URI: http://hdl.handle.net/10069/22218
ISBN: 978-0-7354-0549-3
ISSN: 0094243X
DOI: 10.1063/1.2964568
Rights: Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. / The following article appeared in AIP Conf. Proc. 11027, 1345 (2008), and may be found at http://link.aip.org/link/?APCPCS/1027/1345/1
Type: Conference Paper
Text Version: publisher
Appears in Collections:Conference Paper

Citable URI : http://hdl.handle.net/10069/22218

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