Phase separation time/temperature dependence of some thermoplastics-modified thermosetting systems |
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Authors: | Xiujuan Zhang Xiaosu Yi Yuanze Xu |
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Institution: | (1) The Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China;(2) Institute of Aeronautic Materials, Beijing, 100095, China |
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Abstract: | The phase separation processes of various thermoplastics-modified thermosetting systems which show upper critical solution
temperature (UCST) or lower critical solution temperature (LCST) were studied with emphasis on the temperature dependency
of the phase separation times. It was found that the phase separation time-temperature relationship follows the Arrhenius
equation. The cure-induced phase separation activation energy E
a (ps) generated from the equation is independent of the method used to measure phase separation time. In our experimental
ranges it is found that E
a (ps) is independent of the thermoplastic (TP) content, TP molecular weight and curing rate but it varies with the cure reaction
kinetics and the chemical environments of the systems.
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Translated from Acta Polymerica Sinica, 2007, 8: 725–730 译自: 高分子学报] |
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Keywords: | polymerization induced phase separation thermosetting thermoplastic time and temperature dependence Arrhenius equation |
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