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首页> 外文期刊>Journal of Applied Polymer Science >N,N '-Pentamethylenethiuram disulfide and N,N '-pentamethylenethiuram hexasulfide accelerated sulfur vulcanization. IV. Vulcanization of polyisoprene and 2,3-dimethyl-2-butene in the presence of ZnO
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N,N '-Pentamethylenethiuram disulfide and N,N '-pentamethylenethiuram hexasulfide accelerated sulfur vulcanization. IV. Vulcanization of polyisoprene and 2,3-dimethyl-2-butene in the presence of ZnO

机译：N，N′-五亚甲基秋兰姆二硫化物和N，N′-五亚甲基秋兰姆六硫化物促进了硫的硫化。 IV。 ZnO存在下对聚异戊二烯和2,3-二甲基-2-丁烯的硫化

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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 (bispenta-methylenedithiocarbamate) (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 polysulfides that lead to the formation of thiuram terminated pendent groups. Pentamethylenedithiocarbamic acid, liberated in the process, is trapped by ZnO as ZPD. Crosslinking is more rapid than in the absence of ZnO. ZPD catalyzes the crosslinking of thiuram pendent groups, and high crosslink densities are achieved because the ZPD catalyzed crosslinking of thiuram crosslink pendent groups is more efficient than when thiuram pendent groups crosslink, mainly via a reaction with thiol pendent groups, as is suggested in the absence of zinc. When free sulfur is available in the system, ZPD acts as an accelerator in its own right. Thiuram pendent groups were not detected in ZPD/sulfur formulations with model compounds, but their formation or the formation of thiol pendent groups, either of which may form via sulfurated ZPD, cannot be excluded. ZPD promoted the rapid crosslinking of such pendent groups. Overall, the reaction mechanism with zinc-containing formulations is similar to those for the corresponding TMTD systems. (C) 2000 John Wiley & Sons, Inc. [References: 29]
机译：聚异戊二烯和模型化合物2,3-二甲基-2-丁烯在ZnO和锌的存在下用N，N'-二戊亚甲基秋兰姆二硫化物（CPTD），CPTD /硫和N，N'-二戊亚甲基秋兰姆六硫化物（CPTP6）硫化（双五亚甲基二硫代氨基甲酸酯）（ZPD），以及在反应的各个阶段通过HPLC分析的残留可萃取固化剂和反应中间体。 CPTD和ZnO在硫化温度下不发生反应，并且像在无锌系统中一样，该反应由促进剂多硫化物引发，导致形成秋兰姆封端的侧基。在此过程中释放的五亚甲基二硫代氨基甲酸被ZnO捕获为ZPD。交联比没有ZnO时更快。 ZPD催化秋兰姆侧基的交联，并获得高交联密度，这是因为ZPD催化秋兰姆侧基的交联比秋兰姆侧基的交联更有效，主要是通过与硫醇侧基的反应实现的，这在不存在的情况下是有建议的。锌。当系统中有游离硫时，ZPD本身就充当促进剂。在带有模型化合物的ZPD /硫制剂中未检测到秋兰姆侧基，但不能排除它们的形成或巯基侧基的形成，后者可能是通过硫化ZPD形成的。 ZPD促进了这些侧基的快速交联。总体而言，含锌配方的反应机理与相应的TMTD系统相似。 （C）2000 John Wiley＆Sons，Inc. [参考：29]

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