采用氧指数法、垂直燃烧法、锥形量热仪法对二苯基砜磺酸钾(KSS)、聚偏氟乙烯(PVDF)、聚氨丙基苯基倍半硅氧烷(PAPSQ)三元复合改性聚碳酸酯(PC)的阻燃性进行表征.结果表明在三者用量分别为0.1%、0.3%、0.3%时,改性PC的极限氧指数(LOI)达38.8%、阻燃等级通过UL94V-0@1.6mm,锥形量热燃烧参数方面有效燃烧热峰值 (PEHC)比纯PC降低11.5%、点燃时间延长8s,而释热速率(HRR)却高10%左右, 不同的测试方法得出的阻燃性能结果存在较大差异.采用FTIR分析LOI和锥形量热燃烧炭层发现前者为高度交联的芳香化合物结构,而后者PC燃烧彻底,PAPSQ迁移至表面燃烧生成SiO2.
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