Article (Scientific journals)
Chemically induced transition phenomena in polyurethanes as seen from generalized mode Grüneisen parameters.
Müller, Ulrich; Philipp, Martine; Bactavatchalou, R. et al.
2008In Journal of Physics: Condensed Matter, 20 (20), p. 205101-205108
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Abstract :
[en] Many phenomenological properties of reactive polymers like polyurethanes increase or decrease continuously in the course of the curing process before saturating at the end of the chemical reaction. This holds true for instance for the mass density, the refractive index, the chemical turnover and the hypersonic properties. The reason for this monotone behaviour is that the chemical reaction behaves like a continuous succession of irreversible phase transitions. These transitions are superposed by the sol–gel transition and possibly by the chemically induced glass transition, with the drawback that the latter two highlighted transitions are often hidden by the underlying curing process. In this work we propose generalized mode Grüneisen parameters as an alternative probe for elucidating the polymerization process itself and the closely related transition phenomena. As a model system we use polyurethane composed of a diisocyanate and varying ratios of difunctional and trifunctional alcohols.
Disciplines :
Materials science & engineering
Physics
Identifiers :
UNILU:UL-ARTICLE-2009-036
Author, co-author :
Müller, Ulrich ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Philipp, Martine ;  Laboratoire Européen de Recherche, Universitaire Saarland-Lorraine, Luxembourg
Bactavatchalou, R.;  Fachbereich Werkstoffwissenschaften, Universität des Saarlandes, D-66123 Saarbrücken, Germany
Sanctuary, Roland ;  LPMI, Université Nancy, France
Baller, Jörg ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Zielinski, Bartosz
Possart, Wulff
Alnot, Patrick
Krüger, Jan-Kristian ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Language :
English
Title :
Chemically induced transition phenomena in polyurethanes as seen from generalized mode Grüneisen parameters.
Publication date :
2008
Journal title :
Journal of Physics: Condensed Matter
ISSN :
1361-648X
Publisher :
IOP Publishing
Volume :
20
Issue :
20
Pages :
205101-205108
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 18 December 2013

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