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Influence of the network on the interaction parameter in system EPDM vulcanizate–solvent
Author(s) -
HrnjakMurgić Z.,
Jelenčić J.,
Bravar M.,
Marović M.
Publication year - 1997
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/(sici)1097-4628(19970801)65:5<991::aid-app17>3.0.co;2-v
Subject(s) - swelling , flory–huggins solution theory , materials science , solvent , polymer chemistry , ethylene propylene rubber , thermodynamics , polymer , polymer science , composite material , copolymer , chemistry , organic chemistry , physics
Swelling measurements in six organic solvents were carried out on samples of dicumyl peroxide crosslinked ethylene–propylene–diene (EPDM) having various crosslink densities. The Flory–Huggins interaction parameter χ was determined for EPDM vulcanizates 312 and 812 as well as their mixture 312/812 using the Flory–Rehner equation. The results show that the χ parameter for the crosslinked polymer is greater than for the uncrosslinked one and is a linear function of the crosslink density. The swelling behavior of the networks were also interpreted by the Flory–Erman theory using the structural factor F 4 ′ to characterize the network and its behavior during the swelling. The obtained χ values indicate that broadening of the molecular mass distribution, in the Gaussian region of distribution, mixture 312/812, increases interactions with solvents. © 1997 John Wiley & Sons, Inc. J Appl Polm Sci 65:991–999, 1997