摘要
以苯基三甲氧基硅烷为原料,在酸性条件下利用水解缩合法,制备得到了苯基聚倍半硅氧烷,并对影响苯基聚倍半硅氧烷硅分子量的有关因素进行了分析。结果表明,改变溶剂配比可实现对苯基聚倍半硅氧烷分子量大小及分布的调控,控制盐酸的浓度为质量分数3.5%,水的量为质量分数80%为最佳物料配比;FTIR分析表明,PTMS水解完全,硅羟基间脱水缩合,生成Si-O-Si主链,有明显的特征吸收峰;TG-IR分析表明,苯基聚倍半硅氧烷热分解主要分两个阶段进行,第一阶段分解产物很少,主要为表面吸收的水分和反应不完全残留的低分子量倍半硅氧烷的挥发,第二阶段主要发生重排式降解,生成低聚倍半硅氧烷,苯环及其衍生物,在895℃高温下,有机基团氧化生成CO2。
Phenylpolysilsesquioxane was synthesized through hydrolysis and condensation method using phenyltrimethoxysilane as raw materials in acid condition.The related factors influencing the molecular weight of phenylpolysilsesquioxane were analyzed,Studies showed that we can adjust the olecular weight of phenylpolysilsesquioxane by changing the ratio of the solvent and the best ratio of material was that controlled the mass fraction of HCI at 3.5wt% and water at 80wt%.FTIR analysis show that all of the PTMS have been hydrolysis,the condensation between Si-OH reacted Si-O-Si,it has characteristic absorption peak in the FTtR. TG-IR analysis showed that the thermal degradation of phenylpolysilsesquioxane divided into two stages.In the first stage,there is little decompositon products,which were surface absorption of moisture and little oligomer. In the second stage, the reaction were mainly rearrangement degradation, the main products were oligomer, benzene and its derivatives,when the temperature reached 895 degrees centigrade, a litthe organic group were oxidized by residual oxygen.
出处
《合成材料老化与应用》
2015年第2期78-82,共5页
Synthetic Materials Aging and Application
