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Polymer–solvent interaction parameters and efficiency of crosslinking of ethylene–propylene copolymers
Author(s) -
Flisi U.,
Crespi G.
Publication year - 1968
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.1968.070120814
Subject(s) - ethylene propylene rubber , copolymer , materials science , vulcanization , peroxide , benzene , solvent , polymer chemistry , swelling , ethylene , polymer , flory–huggins solution theory , elastomer , chemistry , organic chemistry , natural rubber , composite material , catalysis
A study has been carried out of the vulcanization of ethylene–propylene copolymers having different propylene contents, by use of an organic peroxide. The polymersolvent interaction parameter μ, calculated by the Flory‐Rehner equation from values of ν e and v r , was found to be a linear function of v r with benzene as the swelling agent. Values of μ and their dependence upon v r were independent of copolymer composition, at least within the limits of experimental error, for samples having a propylene content of 30–60 mole‐%. The crosslinking efficiency of the peroxide used was found to depend considerably on copolymer composition, in agreement with the results found for dicumyl peroxide. Finally, sulfur as a crosslinking coagent was found to exert a large effect on the value of ν e , calculated from the equilibrium retractive force of benzene‐swollen specimens.