支链含硅共聚物的制备及结构表征

PREPARATION AND STRUCTURE ANALYSIS OF BRANCH-SILICON-CONTAINING CO-POLYMER

以二氧化硅为起始原料,与乙二醇、氢氧化钾反应,生成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出含双键官能团的四配位硅单体;然后与甲基丙烯酸甲酯进行自由基聚合反应,得到了支链含硅的共聚物。最后对合成的四配位硅单体及共聚物进行了IR、TG、DSC、GPC结构表征。IR表明,四配位硅单体在1629.6 cm-1处的C=C伸缩振动吸收峰在共聚物中消失;TG表明四配位硅单体在67℃就开始失重,437℃有机部分基本失重完毕,而共聚物在150℃左右开始失重,550℃有机部分失重完毕;DSC表明,共聚物的玻璃化温度为55.0℃;GPC分析表明,共聚物的分子量为3千左右。

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 co-polymer was prepared by the reaction of this tetra-coordinated silicon monomer with MMA using free radical polymerization. Then the tetra-coordinate silicon monomer and co-polymer were characterized by FT-IR, TG, DSC, GPC etc. The IR spectrum of tetra-coordinate silicon monomer indicated a absorption band for C=C at 1629. 6 cm^-1, but the IR spectrum of co-polymer exhibited no absorption band at near 1629.6 cm^-1; TG analysis showed tetra-coordinate silicon monomer losing weight at 67 ℃ until 437℃, but the co-polymer began losing weight at 150℃ ,until 600℃, GPC analysis showed that the molecular weight of the co-polymer is about 3 thousands.