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首页> 外文期刊>Journal of Applied Polymer Science >Benzothiazole-accelerated sulfur vulcanization. II. 2-mercaptobenzothiazole/zinc oxide and bis(2-mercaptobenzothiazole)zinc(II) as accelerators for 2,3-dimethyl-2-butene
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Benzothiazole-accelerated sulfur vulcanization. II. 2-mercaptobenzothiazole/zinc oxide and bis(2-mercaptobenzothiazole)zinc(II) as accelerators for 2,3-dimethyl-2-butene

机译：苯并噻唑促进的硫磺硫化。二。 2-巯基苯并噻唑/氧化锌和双（2-巯基苯并噻唑）锌（II）作为2,3-二甲基-2-丁烯的促进剂

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2,3-Dimethyl-2-butene (TME) was used as a model compound for polyisoprene in a study of 2-mercaptobenzotiazole (MBT)-accelerated sulfur vulcanization in the presence of ZnO. Mixes of curatives and TME were heated isothermally in evacuated sealed glass ampules at 150 degrees C for various times and the reaction intermediates and products analyzed by HPLC. In the absence of sulfur, even though MBT and ZnO react to form bis(2-mercaptobenzothiazole)zinc(II) [Zn(mbt)(2)], no crosslinking resulted. On addition of sulfur, the (incomplete) conversion of MBT and ZnO to Zn(mbt)(2) permitted vulcanization from the outset. Benzothiazole-terminated pendent groups were not detected, and crosslinking is proposed to occur via pendent groups that incorporate zinc. It is proposed that polysulfidic Zn(mbt)(2) reacts with TME to form zinc-containing pendent groups and MET. These zinc-containing pendent groups are highly reactive and react with TME to form crosslinked products and MET. The reaction was more rapid and the induction period prior to crosslinking was removed on increasing the MBT concentration in the system. This is ascribed to an exchange reaction between Zn(mbt)(2) and MBT polysulfides, formed by the interaction of MBT with sulfur, leading more rapidly to high concentrations of polysulfidic Zn(mbt)(2) and, hence, to zinc-containing pendent groups. MBT released during Zn(mbt)(2)-initiated crosslinking would, in part, contribute to crosslinking via TME-SxH. (C) 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1386-1394, 2000. [References: 23]
机译：2,3-二甲基-2-丁烯（TME）被用作聚异戊二烯的模型化合物，用于研究在ZnO存在下2-巯基苯并噻唑（MBT）促进的硫磺硫化。将固化剂和TME的混合物在抽真空的密封玻璃安瓿瓶中于150℃等温加热不同时间，然后用HPLC分析反应中间体和产物。在没有硫的情况下，即使MBT和ZnO反应形成双（2-巯基苯并噻唑）锌（II）[Zn（mbt）（2）]，也不会发生交联。添加硫磺后，MBT和ZnO的（不完全）转化为Zn（mbt）（2）允许从一开始就进行硫化。未检测到苯并噻唑封端的侧基，建议通过结合锌的侧基发生交联。有人提出多硫化锌（mbt）（2）与TME反应形成含锌侧基和MET。这些含锌侧基具有很高的反应性，可与TME反应形成交联产物和MET。反应更加迅速，并通过增加体系中的MBT浓度来消除交联前的诱导期。这归因于Zn（mbt）（2）与MBT多硫化物之间的交换反应，这是MBT与硫的相互作用形成的，从而更迅速地导致高浓度的多硫化物Zn（mbt）（2），因此导致锌-包含下垂组。在Zn（mbt）（2）引发的交联过程中释放的MBT将部分有助于通过TME-SxH进行交联。 （C）2000 John Wiley＆Sons，Inc. J Appl Polym Sci 76：1386-1394，2000。[参考：23]

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