作　　者： ; ; ; (吴伟卿）;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《粘接》 2009年第4期41-44,共4页

摘　　要： 利用甲酸和过氧化氢原位生成的过氧甲酸对苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物进行环氧化,制备了环氧化SBS(ESBS)。采用FT-IR、GPC、TGA和MFR对ESBS进行了表征,分析了环氧化反应机理。结果表明,在环氧化反应过程中,SBS分子链上聚丁二烯链段1,4-结构中C=C双键的反应活性要大于1,2-结构中C=C双键的反应活性。当反应时间较长时,ESBS会发生环氧基开环副反应。在SBS的环氧化反应初期,会有部分分子链发生断裂生成小分子产物,反应后期会发生环氧基或C=C双键引发的分子间偶联反应,容易形成交联不溶物。 Epoxidized styrene-butadiene-styrene block copolymers （ESBS） were prepared by epoxidizing of SBS block copolymer with performic acid generated in situ from hydrogen peroxide and formic acid. The structure and properties of ESBS were characterized by FT-IR, GPC, TG and MFR. The results indicated that the C=C double bonds in 1,4-polybutadiene units were more active than that in 1,2- polybutadiene units. With the increase of reaction time, the ring-opening side reactions of epoxy groups would take place. In the earlier reaction stage, some molecular chains ruptured to form side products with lower molecular weight. However, in the later reaction stage, there was crosslinking reaction induced by C=C double bonds or epoxy groups among the ESBS molecular chains, and crosslinked unsolvable substances came into being.

关 键 词： 苯乙烯 丁二烯 苯乙烯共聚物 环氧化 反应机理

领　　域： [化学工程]