含磷有机硅杂化环氧树脂固化体系性能研究

通过磷酸与γ-环氧丙氧基三甲氧基硅烷反应得到含磷有机硅氧烷,并加入到环氧树脂/4,4'-二氨基二苯基甲烷体系中混合,通过溶胶-凝胶的方法制备了含磷有机硅杂化环氧树脂固化物.对固化体系进行了玻璃化转变温度、热失重、阻燃、拉伸强度、冲击强度测试分析.结果表明,该固化体系的阻燃性得到提高,极限氧指数在25.8～29.3,玻璃化转变温度得到提高,在161～179℃;虽然初始分解温度比纯环氧树脂固化物低,但800℃残炭率可以达到26.5%,提高了36%;拉伸强度得到提高,在71～94 MPa,冲击强度可以达到14.36 kJ/m2,提高了14%.该固化体系具有较好的阻燃性能和热性能,同时具有较好的力学性能.

PROPERTIES OF PHOSPHORUS-CONTAINING ORGANIC SILICON/EPOXY HYBRID RESIN

A phosphorus-containing organic silicone was synthesized from γ-glycidoxypropyltrimethoxysilane and phosphoric acid reacting.Phosphorus-containing organic silicone/epoxy hybrid resins were prepared by sol-gel method,and the cured resins were prepared from the in situ curing of the bisphenol-A type epoxy resin/4,4′-diaminodiphenylmethane,and phosphorus-containing organic silicone.The properties of the hybrid resin and neat epoxy resin were studied by using thermogravimetric analysis,differential scanning calorimetry,limited oxygen index,tensile strength and impact strength measurements.The flame retardancy was indicated by the limited oxygen index in the range of 25.8~29.3,higher than that of the neat epoxy resin.The glass transition temperature is in the range of 161~179℃,higher than that of the neat epoxy by resin.The thermal stability of the hybrid resin is not superior to that of the neat epoxy resin at low temperature,however,the char yield of it can reach 26.5%,higher than that of the neat epoxy by 36% at 800℃.The tensile strengths of the hybrid resin are 60~80 MPa,higher than that of the neat epoxy resin and the impact strengths can reach 14.36 kJ/m2,higher than that of the neat epoxy resin by 14%.Compared to the neat epoxy resin,the hybrid resin possesses better flame retardancy and thermal stability,and the tensile strength and impact strength are improved.