N,N?-Pentamethylenethiuram disulfide andN,N?-pentamethylenethiuram hexasulfide accelerated sulfur vulcanization. IV. Vulcanization of polyisoprene and 2,3-dimethyl-2-butene in the presence of ZNO
Abstract:Polyisoprene and model compound, 2,3‐dimethyl‐2‐butene, were vulcanized with N,N′‐dipentamethylenethiuram disulfide (CPTD), CPTD/sulfur and N,N′‐dipentamethylenethiuram hexasulfide (CPTP6) in the presence of ZnO and zinc (bispentamethylenedithiocarbamate) (ZPD), and residual extractable curatives and reaction intermediates analyzed by HPLC at various stages of the reaction. CPTD and ZnO do not react at vulcanization temperatures and, as in zinc‐free systems, the reaction is initiated by accelerator polysulfide… Show more
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