Studies on the toughening and reinforcing effect of nano-SiO₂ on the bismaleimide resin

【作者】 徐启杰； Mengxi Zhao； Zhun Liu； Yanli Shi；

【Author】 Qijie Xu;Mengxi Zhao;Zhun Liu;Yanli Shi;The department of chemistry and chemical engineering, Huanghuai University;

【机构】 The department of chemistry and chemical engineering, Huanghuai University；

【摘要】 Bismaleimides/SiO₂ nanocomposites（BMI/SiO₂） was prepared readily by in situ polymerization method where RNS-E（nano-SiO₂ with surface epoxy group of carbon chain）and RNS-D（nano-SiO₂ with a double bond of carbon chain） were used as the filler. The characteristics of namocomposites were studied by means of Shore hardness tester（D）,TGA, FTIR, and other instruments.Furthermore, the effects of nano-SiO₂ on the thermal stability performance, hardness of bismaleimides,and interfacial strength between nano-SiO₂ and bismaleimides were researched, and studying theirs mechanism.The results showed that the hardness of as-prepared BMI/SiO₂ nanocomposites gradually enhanced with increasing the addition content of nano-SiO₂.The hardness of nanocomposites was 91HC when the RNS-E content was 5%; the hardness of nanocomposite with the content of 3% RNS-D was 91HC,as increased 65% in comparison with the hardness of BMI resins. This indicated that nano-SiO₂ with surface active groups can significantly improve the hardness of bisimaleimides, and the action effect of RNS-D was better than RNS-E.The thermal stability analysis showed that the decomposition temperature of nanocomposites of presented downtrend with the increase of nano-SiO₂, however, which were higher than 439 ° C of BMI resins. The thermal decomposition temperature of nanocomposites reached to 453 °C when the additon amount of RNS-E was 1%, as increased 14 °C in comparison with pure bismaleimides. And the thermal decomposition temperature of nanocomposites with the content of1% RNS-D was 457 °C, as compared with bismaleimides, it increased 18 °C. This showed that the thermal stability performance of BMI resins was improved because of adding to nano-SiO₂ and the action effect of RNS-D better than RNS-E. The surface active groups of nano-SiO₂ as the "bridging point" of nano-SiO₂ chemically binds to bismaleimides, formed the "micro network" structure with taking nano-SiO₂ as the core, through the interfacial effect of BMI/SiO₂ nanocomposites was analyzed,thereby enhancing the interfacial strength of nanocomposite.更多还原

【Abstract】 Bismaleimides/SiO₂ nanocomposites（BMI/SiO₂） was prepared readily by in situ polymerization method where RNS-E（nano-SiO₂ with surface epoxy group of carbon chain）and RNS-D（nano-SiO₂ with a double bond of carbon chain） were used as the filler. The characteristics of namocomposites were studied by means of Shore hardness tester（D）,TGA, FTIR, and other instruments.Furthermore, the effects of nano-SiO₂ on the thermal stability performance, hardness of bismaleimides,and interfacial strength between nano-SiO₂ and bismaleimides were researched, and studying theirs mechanism.The results showed that the hardness of as-prepared BMI/SiO₂ nanocomposites gradually enhanced with increasing the addition content of nano-SiO₂.The hardness of nanocomposites was 91HC when the RNS-E content was 5%; the hardness of nanocomposite with the content of 3% RNS-D was 91HC,as increased 65% in comparison with the hardness of BMI resins. This indicated that nano-SiO₂ with surface active groups can significantly improve the hardness of bisimaleimides, and the action effect of RNS-D was better than RNS-E.The thermal stability analysis showed that the decomposition temperature of nanocomposites of presented downtrend with the increase of nano-SiO₂, however, which were higher than 439 ° C of BMI resins. The thermal decomposition temperature of nanocomposites reached to 453 °C when the additon amount of RNS-E was 1%, as increased 14 °C in comparison with pure bismaleimides. And the thermal decomposition temperature of nanocomposites with the content of1% RNS-D was 457 °C, as compared with bismaleimides, it increased 18 °C. This showed that the thermal stability performance of BMI resins was improved because of adding to nano-SiO₂ and the action effect of RNS-D better than RNS-E. The surface active groups of nano-SiO₂ as the "bridging point" of nano-SiO₂ chemically binds to bismaleimides, formed the "micro network" structure with taking nano-SiO₂ as the core, through the interfacial effect of BMI/SiO₂ nanocomposites was analyzed,thereby enhancing the interfacial strength of nanocomposite.更多还原