作　　者： ; ; ; ; ;

机构地区： 广州大学化学化工学院化学系

出　　处： 《应用化学》 2007年第2期173-177,共5页

摘　　要： 以SiO_2为起始反应物,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,并以此为原料与等摩尔比的对苄氯苯乙烯反应制备出含双键单官能团的四配位硅单体;然后与丙烯酸甲酯在甲苯溶剂中进行溶液自由基聚合反应,得到支链含硅共聚物。对合成的四配位硅单体及其共聚物采用红外光谱、元素分析、能谱元素分析、热失重分析、差示扫描量热谱分析、凝胶渗透色谱等测试技术进行了结构表征与性能分析。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中消失了,说明共聚反应完全;共聚物的热性能较好．在357℃开始失重;共聚物的玻璃化转变温度为23．4℃,刚好界于聚丙烯酸甲酯的T_g(8℃)和苯乙烯基四配位硅的均聚物的T_8(32．8℃)之间;共聚物的数均分子量为2．2×10~4,多分散系数为1．76。通过测定共聚物在潮湿空气中(相对湿度RH=90％)放置一年后的IR谱和分子量,结果表明与新合成物的数据基本一致,说明Si—O—C键接到支链上的共聚物结构很稳定。 High reactive penta-coordinated organic silicon was prepared by the reaction of silica with ethylene glycol and potassium hydroxide. 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 methyl acrylate via free radical polymerization. The tetra-coordinated silicon monomer and co-polymer were characterized by FTIR, EA, EDS, TG, DSC, GPC etc. The absorption band for C=C at 1 630 cm^- 1 of the co-polymer disappeared, indicating that the co- polymerization was complete. The co-polymer began to decompose at 357 ℃ ; the glass transition temperature was 23.4 ℃ between the PMA （ Tg = 8 ℃ ） and the homer-polymer of tetra-coordinated silicon （ Tg = 32. 8 ℃ ） ; the molecular weight of the co-polymer was about 2. 2 × 10^4, the dispersion coefficient was 1.76. The IR spectrum and the molecular weight of co-polymer were characterized after one year under moisture （ RH = 90% ）, and the results indicated no change, suggesting that the copolymer was stable.

关 键 词： 配位硅化合物 自由基聚合 丙烯酸甲酯

领　　域： [理学] [理学]