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Bis(diisopropyl) thiophosphoryl disulfide in cis ‐1,4‐polyisoprene vulcanization reactions. I. As a sulfur donor
Author(s) -
Pimblott J. G.,
Scott G.,
Stuckey J. E.
Publication year - 1975
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.1975.070190322
Subject(s) - vulcanization , sulfur , disulfide bond , polymer chemistry , natural rubber , chemistry , molecule , zinc , materials science , organic chemistry , biochemistry
Bis(diisopropyl)thiophosphoryl disulfide (DIPDIS) is used as a sulfur donor vulcanizing system for cis ‐1,4‐polyisoprene. It is shown that the network structure consists of poly‐ and disulfidic crosslinks at early stages of cure, simplifying at optimum cure to monosulfidic crosslinks. It is thought that pendent accelerator groups are bound to the rubber molecule at early stages of cure, but are subsequently replaced by cyclic sulfidic groups. The good thermal and thermal oxidative aging behaviour of the vulcanizate is due to the formation of zinc diisopropyldithiophosphate (ZDP) in situ.