聚苯基硅氧烷与聚甲基苯基硅氧烷改性环氧树脂的合成与性能比较  

SYNTHESIS AND PROPERTIES OF POLYPHENYLSILICONE AND POLYMETHYLPHENYLSILICONE MODIFIED EPOXY RESINS

作　　者：李因文[1,2] 沈敏敏[1] 黄活阳[1,2] 马一静[1,2] 哈成勇[1] 

机构地区：[1]中国科学院纤维素化学重点实验室广州化学研究所,广州510650 [2]中国科学院研究生院,北京100039

出　　处：《高分子学报》2009年第11期1086-1090,共5页Acta Polymerica Sinica

基　　金：广东省关键领域重点突破项目(项目号2006A25002002);广东省自然科学基金研究团队项目(基金号E06200692)资助

摘　　要：热熔法制备了一系列聚苯基甲氧基硅氧烷(PPMS)、聚甲基苯基甲氧基硅氧烷(PMPS)改性环氧树脂,通过环氧值、红外光谱(IR)分析表明聚硅氧烷接枝了E-20环氧树脂且环氧基保持不变.探讨了有机硅含量对改性树脂固化体系耐热性能及韧性的影响.实验表明,当E-20环氧树脂与PPMS、PMPS的质量比为7∶3时,改性树脂固化体系的耐热性能明显提高,玻璃化转变温度(Tg)为95.8、88.3℃,分别比改性前提高了9.0℃和1.5℃;质量损失50%时的热分解温度(Td)为476.5、487.8℃,分别比改性前提高了58.3℃和69.5℃.与ED-30固化体系相比,EPMS-30固化物的耐热性能,韧性等力学性能提高的更加明显,并且还具有优良的涂膜性能.Silicone modified epoxy resins were prepared by polycondensation of polyphenylmethoxysilicone（PPMS） and polymethylphenylsilicone（PMPS） with E-20 epoxy resin.Oxirane ring and epoxy values were determined by Fourier transform infrared（FTIR） spectroscopy and HCl/acetone method.The data indicated that silicone oligomers were incorporated into epoxy resin with a random polycondensation and without involving the opening of the oxirane ring in the silicone modified epoxy structure.The influences of silicone contents on the heat-resistant properties of cured silicone modified epoxy resin systems were investigated by differential scanning calorimetry（DSC） and thermogravimetic analysis（TGA）.The DSC data showed with increasing siloxane content in copolymers the glass transition temperature（Tg） lowered gradually.But when the mass ratio of epoxy resin to PPMS,PMPS was 7∶3,the Tg was 95.8℃ and 88.3℃,higher than those of unmodified epoxy resins systems by 9.0℃ and 1.5℃ respectively.The TGA data indicated that siloxane moiety exerts its thermal stability on the copolymer through dissipation of the heat,thus delaying thermal degradation of the copolymers.when the mass ratio of epoxy resin to PPMS,PMPS was 7∶3,the 50% weight loss temperature of degradation（Td） was 476.5℃ and 487.8℃,higher than those of unmodified epoxy resins systems by 58.3℃ and 69.5℃ respectively.In contrast to ED-30 cured system,the heat-resistance and toughness of EPMS-30 cured systems improved more obvious,and its film coatings also showed more excellent filming properties.

关 键 词：PPMS PMPS 环氧树脂 改性 韧性 耐热性 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]