为了提高液体硅橡胶的性能,设计合成了一种活性六(2-烯丙基苯氧基)环三磷腈衍生物(HAPPCP)改性剂,研究了HAPPCP对加成型液体硅橡胶力学性能、热稳定性能、耐烧蚀性能及阻燃性能的影响。结果表明:相比于未改性体系,3份HAPPCP改性加成型液体硅橡胶的拉伸强度和断裂伸长率分别提升40.5%与204.4%,质量烧蚀率和线性烧蚀率分别降低了19.90%和55.70%,5份HAPPCP可使800℃的质量残留率提升由18.86%提升到30.15%;HAPPCP改性加成型硅橡胶的阻燃性能获得改善,使改性硅橡胶材料从易燃材料变为可燃材料,燃烧过程中总热释放速率下降、热释放速率峰值降低、释烟量下降,材料燃烧时的危险等级减轻。
To improve the properties of liquid silicone rubber (SR),an active hexa(2-allylphenoxy) cyclic triphosphonitrile derivative modifier (HAPPCP) was designed and synthesized,and the effects of HAPPCP on the mechanical properties,thermal stability,ablation resistance,and flame retardancy of addition type SR were investigated.The results showed that,compared with the unmodified SR,the tensile strength and elongation at break of 3 phr HAPPCP-modified addition type SR were improved by 40.5% and 204.4%,respectively,and the mass ablation rate and linear ablation rate were reduced by 19.90% and 55.70%,respectively.When 5 phr of HAPPCP were added,the mass residual rate at 800℃increased from 18.86% to 30.15%.The flame retardancy of the HAPPCP-modified addition type SR was improved,turning it from a flammable to a combustible material.The total heat release rate,the peak value of the heat release rate,the amount of smoke release and the hazardous level of modified SR all reduced in the combustion process.
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