有机硅改性环氧树脂制备及热稳定性

Modification of epoxy resin with diphenyl silanediol and its thermal stability

采用二苯基硅二醇与双酚A型环氧树脂(E-44)反应,制备有机硅环氧树脂及其固化物.通过正交和单因素实验研究原料物质的量比、反应温度和时间对树脂热稳定性的影响,用热机械分析仪、热失重分析仪、傅立叶变换红外光谱仪和化学滴定分析等对改性树脂进行表征.结果表明,用二苯基硅二醇改性E-44,在催化剂为二丁基二月桂酸锡,二苯基硅二醇与E-44物质的量比1∶4,反应温度110℃,反应时间2 h时,得综合热稳定性能优异的有机硅改性环氧树脂,较未改性环氧树脂,其热膨胀系数下降33.2%,内应力参数下降36.3%,初始热分解温度提高15℃,而玻璃化转变温度无明显降低,有良好的热稳定性.

Modification of epoxy resin with organic silicone is an effective method to prepare the new thermosetting epoxy resin with high thermal stability,low shrinkage,and good mechanical properties.Diphenyl silanediol and bisphenol A epoxy resins（E-44） were used to prepare the silicone-epoxy resins and the cured materials.The chemical structure and thermal mechanical properties of the modified resins were characterized by thermal mechanical analyzer（TMA）,thermogravimetric analysis（TGA）,infrared spectroscopy（IR）,etc.The optimized synthesis conditions are determined by the orthogonal and single-factor experimental design as molar ratio（diphenyl silicone diol/E-44）（1∶4）,reaction temperature（110 ℃）,and reaction times（2 hours）.The results show that the coefficient of thermal expansion and thermal stress parameter of the diphenyl siliconediol modified epoxy resins decrease 33.2% and 36.3% respectively,the decomposition temperature increase 15 ℃ and the glass transition temperature has no significant decline compared with those of unmodified epoxy resin,exhibiting good thermal stability.