由苯乙烯基四配位硅单体合成支链含硅共聚物

Preparation of Copolymer Containing Silicon Branch from Styryl-tetra-coordinate Silicon Monomer

以二氧化硅与乙二醇、氢氧化钾反应制得高反应活性的五配位硅钾化合物,并以此为原料与对苄氯苯乙烯反应制备了含双键官能团的四配位硅单体,然后使其与苯乙烯进行自由基聚合反应,得到了支链含硅的共聚物。用红外光谱(IR)、元素分析(EA)、能谱元素分析(EDS)、热重分析(TG)、差示扫描量热分析(DSC)、凝胶渗透色谱分析(GPC)等对四配位硅单体及其共聚物结构进行了表征。结果表明:四配位硅单体在1 630 cm-1附近的C=C伸缩振动吸收峰在共聚物谱中消失了;共聚物在350°C才开始分解,其玻璃化温度为58°C,数均分子量为8.5×104。

A high reactive penta-coordinated organic silicon was prepared by the reaction of silica with ethylene glycol and potassium hydroxide. A double bond tetra-coordinated silicon was produced by the reaction of this penta-coordinated silicon with 4-vinylbenzyl chloride; Then branch-silicon-containing copolymer was prepared by the reaction of this tetra coordinated silicon monomer with styrene using free radical polymerization. Then the tetra-coordinate silicon monomer and copolymer were characterized by IR,EA,EDS,TG ,DSC,GPC etc. The IR spectrum of tetra-coordinate silicon monomer indicated a absorption band for C=C at 1 630 cm^-1, but the IR spectrum of copolymer exhibited no absorption band at near 1 630 cm^-1; TG analysis shows the copolymer begin losing weight at 350℃; the glass transition temperature is 58℃; GPC analysis shows that the molecular weight of the copolymer is about 8.5×10^4.