硅磷杂化物/环氧树脂固化物的性能研究

Study on Properties of Cured Epoxy Resins Containing Hybrid of Silicon-phosphorus

以γ-环氧丙氧基三甲氧基硅烷(KH-560)与磷酸反应合成了一种含磷硅烷偶联剂,将这种含磷硅烷偶联剂与硅溶胶按一定配比进行水解缩聚反应,得到一种硅磷杂化物,将该硅磷杂化物引入到双酚A环氧树脂(E-51),以4,4′-二氨基二苯基甲烷为固化剂,制备了硅磷杂化物/环氧树脂固化物。对该固化物的玻璃化转变温度、热失重、拉伸强度、极限氧指数(LOI)进行了测试。结果表明,该固化物玻璃化转变温度,700℃残炭量以及LOI均比纯环氧树脂固化物高,拉伸强度却下降较少。当硅磷杂化物的添加量占环氧树脂质量的50%时,该固化物的玻璃化转变温度可以达到178℃,极限氧指数可以达到28.2,与纯环氧树脂固化物相比,分别提高了18℃和25%。与纯环氧树脂固化物相比,该硅磷杂化物/环氧树脂固化物具有较好的阻燃性及热稳定性。

One kind of hybrid of silicon-phosphorus was prepared via the hydrolysis and the polycondensation reaction of silica sol and phosphorus-containing silicon coupling agent,which was synthesized by 3-glycidoxypropyl trimethoxysilane and phosphoric acid.A cured epoxy resin containing hybrid of silicon-phosphorus was prepared by the in situ curing of the bisphenol-A type epoxy resin and 4,4＇-diaminodiphenylmethane with the hybrid of silicon-phosphorus.Determinations of differential scanning calorimetry,thermogravimetric analysis,limited oxygen index and tensile testing were carried out to characterize the cured products.Results showed that the glass transition temperature,the residual char yield under 700 ℃ and the limited oxygen index increased,but the tensile strength descended less.The limited oxygen index of the cured epoxy resin containing hybrid of silicon-phosphorus was 28.2,Tg=178 ℃,higher than those of pure epoxy resin by 25% and 18 ℃,respectively,when 50% the hybrid of silicon-phosphorus was added in the epoxy resin.Compared to the pure epoxy resin,the cured epoxy resin containing hybrid of silicon-phosphorus possessed a flame resistance and the thermal properties were improved.