有机硅改性提高环氧树脂韧性和耐热性的研究

用聚甲基三乙氧基硅烷(PTS)通过物理和化学改性两种方法,成功制备了一系列有机硅改性环氧树脂。通过对化学改性产物的红外光谱、环氧值和相对分子质量及分布的测定,表明有机硅已成功引入环氧树脂。对两种改性方法所得固化物的玻璃化转变温度(Tg)、拉伸强度及断裂伸长率、热稳定性、微观结构进行了分析测定,探讨了改性方法、有机硅含量等对材料性能的影响。结果表明,化学改性环氧树脂产物具有更为优良的性能,双酚A型环氧树脂E-44(简写EP)通过PTS化学反应改性,当m(EP)∶m(PTS)=100∶10时,其固化物拉伸强度达58.36 MPa,断裂伸长率达11.65%,Tg达169.82℃,50%的质量热损失温度达到487℃;比未改性的纯环氧树脂分别提高了9.42 MPa,4.91%,17.29℃,39℃。

Investigation of Siloxane-modified Epoxy Resins for Improving Toughness and Thermal Properties

A series of siloxane-modified epoxy resins were successfully prepared by physical and chemical modification methods using poly(methyltriethoxysilane)(PTS).IR spectrum,epoxy value,relative molecular mass and distribution determination indicate that PTS is incorporated into epoxy resin.The influences of modification methods and contents of organic silicon on the material were investigated via measurting the glass transition temperature(Tg),tensile strength and elongation,microstructure and thermal stability of the cured materials.The results show that the tensile strength of the cured materials(mass ratio of epoxy resin to PTS is 100∶10) is 58.36 MPa,elongation=11.65%,Tg=169.82 ℃,and temperature of 50% weight loss is 487 ℃,higher than those of pure epoxy resin by 9.42 MPa,4.91%,17.29 ℃ and 39 ℃ respectively.