Role of epoxidation on segmental motion of polyisoprene as studied by broadband dielectric spectroscopy

ABSTRACT In this article, the broadband dielectric spectroscopy (BDS) is used to investigate the relaxation behavior of polyisoprene (PI) epoxidized to various levels and the special consideration is devoted to the effect of epoxidation degree on segmental relaxation. To associate segmental relaxati...

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Bibliographic Details
Published in:Journal of applied polymer science 2016-09, Vol.133 (35), p.np-n/a
Main Authors: Luo, Ming-Chao, An, Ran, Gao, Xiao-Xiao, Zeng, Jian, Huang, Guang-Su
Format: Article
Language:English
Subjects:
Broadband
dielectric properties
Dielectric relaxation
Dielectrics
Epoxidation
glass transition
Materials science
Mathematical analysis
Molecular structure
Polyisoprenes
Polymers
rubber
Spectroscopy
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Summary:ABSTRACT In this article, the broadband dielectric spectroscopy (BDS) is used to investigate the relaxation behavior of polyisoprene (PI) epoxidized to various levels and the special consideration is devoted to the effect of epoxidation degree on segmental relaxation. To associate segmental relaxation with molecular structure, several empirical equations are used to fit experimental data. Furthermore, we want to discuss the origin of the change of segmental relaxation. Thermal measurement reveals that glass transition temperature of epoxidized PI (EPI) increase with the increase of epoxidation degrees. The epoxidation modification increases the breadth of the dielectric dispersion. Oxirane groups as steric interference enhance the cooperativity of segmental relaxation process and retard the relaxation process, which results in the increase of coupling parameter. Specifically, Vogel–Fulcher–Tammann equation shows the relationship between correlation length and temperature. These results further illustrate the effect of epoxidation group on segmental motion of PI. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43879.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.43879