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首页> 外文期刊>Polymer Preprints >Real-time fiber optic FTIR monitoring of sequential living isobutylene and styrene block copolymerization
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Real-time fiber optic FTIR monitoring of sequential living isobutylene and styrene block copolymerization

机译：实时光纤FTIR监测连续活性异丁烯和苯乙烯嵌段共聚

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摘要

Block copolymers of isobutylene (IB) and styrene (St) are of interest because they phase separate due to the immiscibility of the rubbery polyisobutylene (PIB) and the glassy polystyrene (PS) phases, exhibiting thermoplastic elastomeric properties. These block copolymers can be prepared by sequential living carbocationic polymerization of IB and St. IT was shown that that in order to obtain efficient crossover from the living IB, the use of additives (both electron pair donors such as N,N-dimethylacetamide (DMA) and proton traps like 2,6-di-tert-butylpyridine (DtBP) or diphenylethylene) is necessary. The role of additives is not clear and is actively debated. This paper describes the use of the recently developed fiber optic mid-range FTIR monitoring technique to monitor the sequential living carbocationic block copolymerization of IB and St initiated by α-methylstyrene epoxide (MSE), a recently discovered initiator. The same technique was used to monitor the complexation of DMA and TiCl_4.
机译：异丁烯（IB）和苯乙烯（St）的嵌段共聚物是令人关注的，因为它们由于橡胶状聚异丁烯（PIB）和玻璃态聚苯乙烯（PS）相的不溶性而发生相分离，表现出热塑性弹性体性能。这些嵌段共聚物可以通过IB和St的顺序活性碳阳离子聚合反应来制备。结果表明，为了从活性IB获得有效的交叉反应，需要使用添加剂（两个电子对供体，例如N，N-二甲基乙酰胺（DMA） ）和质子捕集器（如2,6-二叔丁基吡啶（DtBP）或二苯基乙烯）是必需的。添加剂的作用尚不清楚，并且正在积极辩论。本文介绍了使用最近开发的光纤中程FTIR监测技术来监测由最近发现的引发剂α-甲基苯乙烯环氧化物（MSE）引发的IB和St的连续活性碳阳离子嵌段共聚。使用相同的技术来监测DMA和TiCl_4的络合。

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