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星形支化卤化丁基橡胶的合成及研究
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摘要
研究了星形支化溴化丁基橡胶的合成方法,采用活性负离子聚合法制备端基锂聚苯乙烯-异戊二烯共聚物、端基锂聚异戊二烯聚合物并与溴化丁基橡胶胶液反应合成出星形支化卤化丁基橡胶,以期提高丁基橡胶的某些性能,拓宽丁基橡胶的应用领域。采用红外(IR)、核磁(~1H-NMR)等方法对产物进行表征,并采用示差折光指数(RI)/多角激光光散射(LS)/在线粘度(Vis)三台联用测定产物分子量及接枝状况,采用差示扫描量热法(DSC)测定产物的玻璃化转变温度(Tg),采用氧燃烧.电位滴定法对产物进行溴含量测定并探讨合成反应机理,将产物硫化测定硫化胶硬度、拉伸应力、比重等性能,结果表明,硫化胶的扯断伸长率、拉伸强度值比溴化丁基橡胶(BIIR2222)的测得值要高,而这些性能的提升对橡胶制品的应用是非常有益的。
Star-branched brominated butyl rubber(BSBBR) was synthesized by brominated butyl rubber reacted with Li-capped PSt-PIp copolymer or Li-capped PIp, which was prepared by anion polymerization method. The star-branched brominated butyl rubber was expected to improve some properties of butyl rubber,and broaden butyl rubber's application fields. And star-branched brominated butyl rubber were analysed by IR, ~1H-NMR, etc. Besides,using RI/LS/VIS measured the Mn and the arm numbers of star-brominated butyl rubber,using DSC measured the Tg of star-brominated butyl rubber,using oxygen burnt-potentiometer measured the content of bromine in star-branched brominated butyl rubber and then concluded the mechanism of the reaction. Then vulcanized the product and tested its hardness, tensile stress, density,etc.The results showed that the elongation and tensile strength value of star-branched brominated butyl rubber was higher than BIIR,and it was benefit to be used by rubber produce.
引文
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