Mechanical and thermal properties of SiO2 / cyanate ester nano-composites
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摘要: 采用高速均质剪切法制备了SiO2 / 氰酸酯(CE) 纳米复合材料, 并对该体系的静态力学性能、动态力学性能和热稳定性进行了研究。结果表明, 纳米SiO2的加入提高了复合材料的冲击强度和弯曲强度。当SiO2 含量为0. 30 wt %时, 复合材料的冲击强度达最大, 增幅为88. 9 %; 当SiO2含量为0. 15 wt %时, 材料的弯曲强度达最大, 增幅为2010 %。复合材料的储能模量和高温损耗模量较纯CE 树脂有明显提高, 玻璃化转变温度比纯CE 提高了31. 2 ℃, 热分解温度在SiO2含量为0. 30 wt %时达最大, 失重为10 %时的热分解温度提高了25. 7 ℃。Abstract: SiO2 / cyanate ester (CE) nano-composites were prepared by a high-speed homogeneous shearing method ;the quasi-static and dynamic mechanical properties and the thermal stability of the composites were investigated. Theresult s show that the impact and flexural st rengths of the composites obviously increase at the low content of SiO2 .The impact st rength reaches a maximum at 0. 30 wt % SiO2 , which is 88. 9 % higher than that of the pure CE. Andthe flexural st rength reaches a maximum at 0. 15 wt % SiO2 , which is 20 % higher than that of the pure CE. Thestorage modulus and high temperature loss modulus of the composites obviously increase compared with those of thepure CE , and the glass t ransition temperature is 31. 2 ℃ higher than that of the pure CE. It is also found that thedecomposition temperature of the composites reaches a maximum at 0. 30 wt % SiO2 ; when the mass loss of composites is 10 % , the degradation temperature increased by 25. 7 ℃compared with that of the pure CE.
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