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Stress relaxation in rubbers containing reinforced fillers
Author(s) -
Cotten G. R.,
Boonstra B. B.
Publication year - 1965
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1965.070091017
Subject(s) - materials science , composite material , stress relaxation , relaxation (psychology) , stress (linguistics) , polymer science , creep , psychology , social psychology , linguistics , philosophy
Stress relaxation in rubber stocks containing various fillers was measured at room temperature, and an empirical equation found for relating decrease in tension, f t , over a period of time from 0.1 sec. to 6 months, namely:\documentclass{article}\pagestyle{empty}\begin{document}$ f_t = f_{1.0} t^{- n} $\end{document} where f 1.0 is force after 1 min. of relaxation, n is the relaxation rate of material (by definition) and t is time in minutes. Raw rubbers were examined under compression, and cured rubbers were tested under tension. In both cured and raw butadiene rubbers, stress relaxation was found to be a viscous‐controlled process. In raw rubbers, reinforcing carbon blacks decrease the rate of relaxation, while in cured rubbers the effect of carbon black is very small. However, in swollen (to V R = 0.25), cured rubbers, the rate of relaxation increases with increasing carbon black loading, indicating a slippage and/or breakage of some carbon black‐polymer attachments.