SEBS的间接氯甲基化研究

研究了以二甲氧基甲烷和氯化亚砜为原料实现氢化聚苯乙烯-乙烯丁烯无规共聚物-聚苯乙烯三嵌段共聚物(SEBS)苯环对位上的间接氯甲基化. 通过红外光谱和核磁氢谱表征了氯甲基化SEBS的化学结构; 采用佛尔哈德法测定了氯甲基化程度. 通过对比研究几种催化剂的催化效果, 表明氯化锌催化效果最佳, 在氯化锌浓度仅为0.056 mol/L, 45 ℃, 12 h内即可使SEBS的苯环对位氯甲基化程度达到28.94%. 本文还探讨了催化剂用量、反应温度、反应时间对接氯甲基化程度的影响.

Investigation of Indirect Chloromethylation for SEBS

An indirect chloromethylation of poly(styrene-b-ethylene-co-butadiene-b-styrene) (SEBS) was carried out with dimethoxymethane and sulphurous oxychloride as starting materials. The structure of chloromethylated SEBS was characterized with FIRT and ¹H NMR, and its chloromethylation degree was measured with a Volhard method. The catalysis effects of different catalysts were compared, and results showed that ZnCl₂ had the best catalystic effects. Only 0.056 mol/L of catalyst was needed to chloromethylate SEBS to 28.94% chloromethylation degree at 45 ℃ in 12 h. Effects of catalyst concentration, reaction temperature and reaction time on the chloromethylation degree were discussed.