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Fraction of effective sulfur crosslinking in polybutadiene rubber vulcanizates
Author(s) -
Meltzer T. H.,
Dermody W. J.,
Tobolsky A. V.
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.1965.070090910
Subject(s) - polybutadiene , vulcanization , natural rubber , sulfur , crystallinity , materials science , polymer , modulus , polymer chemistry , elastomer , composite material , amorphous solid , polymer science , chemistry , organic chemistry , copolymer , metallurgy
Shear modulus measurements as a function of temperature for the high cis ‐ and high trans ‐isomers of 1,4‐polybutadiene, vulcanized with sulfur in amounts between 2 and 44% of the recipe, show the crosslinking efficiency of sulfur in these systems to be slightly lower than in SBR‐1000, but higher than in natural rubber. Two distinct modes of mechanical behavior are noted with these stereo regular rubbers. There is pronounced crystalline behavior at low degrees of vulcanization. After crystallinity has been destroyed by increased crosslinking, both polymers behave as typical crosslinked amorphous materials. Additional evidence is found to support the conclusion that polymer structure, as well as chemical reactivity, plays an important role in the chemistry of vulcanization.