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The influence of precure dilation on the stress–strain properties of ethylene–propylene terpolymer networks
Author(s) -
Kirkham M. C.
Publication year - 1971
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.1971.070150506
Subject(s) - dilation (metric space) , materials science , vulcanization , modulus , propylene oxide , copolymer , ethylene propylene rubber , thermodynamics , ethylene oxide , composite material , natural rubber , mathematics , physics , polymer , combinatorics
A study has been made of the influence of a dilating liquid, present during vulcanization, on the stress–strain behavior of EPT vulcanizates. Stress–strain measurements performed on the vulcanizates after extraction of the dilating liquid, taken over a range of strain rates, indicate the effective absence of time‐dependent behavior and suggest that a close approach to equilibrium has been achieved. From the experimental data, values of the C 1 and C 2 constants of the empirical Mooney‐Rivlin equation were derived. It was found that both C 1 and C 2 decreased with increased precure dilation, C 2 decreasing more rapidly than C 1 . The observed decrease in C 1 is less than would be predicted by simple analogy with the Gaussian modulus; it is suggested that this difference might be explained by changes in network configuration and topology associated with the precure dilation.