[en] The molecular mobility of polystyrene (PS) chains near the surface of carbon fibers was investigated. The glass transition temperature of very thin coatings deposited on carbon fibers was measured by supported DMTA in order to probe the properties of the thermoplastic interphase. Depending on the fiber impregnation method from the melt or from solution, Tg changed in an opposite way for the thinnest coatings, decreasing with coating thickness in the case of impregnation in the melt and increasing when a polymer solution was used. This observation is explained by degradation of PS in the melt and subsequent preferential segregation of low molar mass chains to the interface. This conclusion is supported by the study of the Tg of coatings made from a bimodal molar mass distribution.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Author, co-author :
Carlier, V.; Université catholique de Louvain (UCL) > Unité de Physique et de Chimie des hauts Polymères
Sclavons, M.; Université catholique de Louvain (UCL) > Unité de Physique et de Chimie des hauts Polymères
Jonas, Alain M; Université catholique de Louvain (UCL) > Unité de Physique et de Chimie des hauts Polymères
Jérôme, Robert ; Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Legras, Roger; Université catholique de Louvain (UCL) > Unité de Physique et de Chimie des hauts Polymères
Language :
English
Title :
Probing thermoplastic matrix-carbon fiber interphases. 1. Preferential segregation of low molar mass chains to the interface
Publication date :
22 May 2001
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
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