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Mg(OH)2/聚苯乙烯复合材料的阻燃机制

, PP. 32-40

Keywords: 氢氧化镁,聚苯乙烯,复合材料,燃烧性能,阻燃机制

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Abstract:

把Mg(OH)2(Magnesiumhydroxide,MH)在不同温度热处理不同时间,得到一系列不同热分解状态的Mg(OH)2(Treatedmagnesiumhydroxide,t-MH)。以MH和t-MH为无卤阻燃剂,聚苯乙烯(PS)为基体,采用熔体共混法制备了MH/PS和t-MH/PS复合材料。详细研究了MH热处理对t-MH/PS复合材料燃烧性能的影响,并以此实验结果为基础提出了复合材料的阻燃机制模型。结果表明,随着热处理温度升高、热处理时间延长,MH逐渐分解并转化成MgO。在相同条件下t-MH/PS复合材料的阻燃性能较MH/PS复合材料显著降低,但是仍然比纯PS有明显提高。此外,MH热分解产生的MgO有促进PS成炭的作用。MH/PS复合材料的阻燃机制是以下几种因素协同作用的结果:(1)MH分解吸热的冷却降温作用;(2)MH热分解释放水蒸气的气相稀释作用;(3)MH热分解产物MgO的固相阻隔与防护作用;(4)MgO促进PS成炭阻燃作用。

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