HIPS/OMMT复合材料在不同燃烧模式下的阻燃特性

采用熔融插层法制备了高抗冲聚苯乙烯/有机蒙脱土(HIPS/OMMT)复合材料,分别用锥形量热仪、氧指数和UL-94 3种方法测试表征材料的阻燃特性。结果表明,锥形量热仪试验表征材料阻燃特性,得到有机蒙脱土对材料阻燃性较好,而在氧指数法和UL-94测试方法下有机蒙脱土对材料阻燃性较差。分析表明,不同测试方法所对应的燃烧模式不同,由于不同燃烧模式的影响,材料的阻燃机理发生不同作用,导致材料阻燃特性表征结果不同。根据插层复合材料的阻燃机理,结合不同燃烧模式下炭渣的热失重分析,讨论了材料的特殊结构与燃烧条件的相互作用,解释了表征结果差别与燃烧条件的关系。

Study on the Fire Retardancy of HIPS/OMMT Composite at Different Burning Modes

HIPS/OMMT composites were prepared by the melt intercalation approach.The cone calorimeter,LOI and UL-94 were used to assess the flammability of HIPS/OMMT composites.It was demonstrated that OMMT exhibits different flame retardancy behaviors in the three different fire tests.In the cone calorimeter test,the OMMT retards HIPS well in terms of significant reduction of heat release rates,while in LOI and UL-94 tests the OMMT improves the flame retardancy of HIPS less.The analyses showed that the three fire tests correspond to different burning modes,which influence the flame retardant effectiveness of OMMT in HIPS.The mechanisms of flame retardancy of HIPS/OMMT composites associated with three methods were discussed.This study examines the burning modes of these fire testing methods as well as the response of PLS material with each mode.