改性硅炔树脂及其复合材料的耐热性能

Modification and Heat-Resistance of Hybrid Composite Containing Silicon and Acetylene Resin

通过格氏试剂反应制得了改性硅炔杂化树脂(GMD)。采用DSC、TGA等分析方法研究了GMD的固化反应及耐热性能。结果表明:GMD固化物在氮气气氛下质量损失5%时的温度(Td5)为631°C,1 000°C时的质量残留率为59%。所制备的玻璃纤维增强复合材料在常温下的弯曲强度为320MPa,在240°C的弯曲强度保留率高达90%,空气条件下经500°C处理7min后,质量保留率仍达到99.7%。该复合材料的玻璃化温度大于400°C,具有优异的耐热性能、力学性能及介电性能。

The silicon-containing poly（arylaeetylene） resin （GMD） was synthesized by condensation reac- tion. The curing mechanism and heat resistance were studied with DSC and TGA. Results showed that the temperature of 5% mass loss （Tds） of the cured GMD was 631℃ in nitrogen. The residual of mass was 59% based on the initial mass at 1 000 ℃. The flexural strength at room temperature of the composite was 324 MPa and the retention rate of flexural strength was 90% at 240 ℃. After heat treated for 7 rain at 500℃ in air, the retain ratio of the composite was 99.7%. The composite of which Tg was more than 400 ℃ possessed excellent high temperature-resistance properties, excellent mechanical and dielectric properties.