含双官能团封端剂的合成及在负离子法制备端基官能化聚苯乙烯中的应用

发布时间：2018-04-01 15:23

  本文选题：封端剂　切入点：负离子聚合　出处：《合成橡胶工业》2017年01期

【摘要】：设计合成了一种含有胺基和烷氧基硅烷基双官能团的封端剂——N-对二甲氨基苯亚甲基-3-三乙氧基硅烷基-1-丙胺(DTEOS),并将其用于通过活性负离子聚合技术制备端基官能化聚苯乙烯(PS-DTEOS)中。采用傅里叶变换红外光谱和核磁共振波谱对DTEOS和PS-DTEOS的微观结构进行了表征,并用凝胶渗透色谱法测定了它们的相对分子质量及其分布。研究了DTEOS与聚苯乙烯基锂的定量反应关系,以及DTEOS加入量、封端反应温度、封端反应时间和聚苯乙烯的相对分子质量对封端效率的影响。结果表明,封端反应在10~20 min内快速完成,且没有副反应发生;封端反应温度在50~80℃和聚苯乙烯的数均分子量在5 000~50 000内变化时对封端效率的影响不大;封端剂可与聚苯乙烯基锂进行等摩尔封端反应,封端效率在80%以上,实现了用封端反应制备官能化聚苯乙烯的预期设想。
[Abstract]:A novel capping agent, N- p-dimethylaminophenyl methyl-3-triethoxysilyl alkyl-1-propylamine, was designed and synthesized, and was used in the preparation of terminal groups by reactive anion polymerization.Functionalized polystyrene (PS-DTEOS).The microstructure of DTEOS and PS-DTEOS were characterized by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance spectroscopy (NMR). The relative molecular mass and their distribution were determined by gel permeation chromatography.The quantitative reaction relationship between DTEOS and polystyrene-lithium was studied, and the effects of the amount of DTEOS, the reaction temperature, the reaction time and the molecular weight of polystyrene on the sealing efficiency were studied.The results showed that the entrapment reaction was completed rapidly within 10 ~ 20 min, and no side reaction occurred, and the end sealing efficiency was not affected by the reaction temperature of 50 ~ 80 鈩，

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