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化工学报  2012 

十溴二苯醚热解动力学及在聚苯乙烯中的热解行为

DOI: 10.3969/j.issn.0438-1157.2012.11.023, PP. 3537-3545

Keywords: 十溴二苯醚,聚苯乙烯,热解动力学,普适积分法,热重红外分析

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Abstract:

十溴二苯醚(decaBDE)是多种聚苯乙烯(PS)类塑料阻燃添加剂,其热解动力学对开发新型高效的电子塑料安全处置技术具有十分重要的意义,为此采用普适积分法成功关联了氮气中decaBDE的热解动力学参数。结果表明:固体decaBDE在306℃时熔融为液相并在400~450℃进一步汽化为气相,热重/红外(TG/IR)分析表明,其气相产物组成具有与decaBDE相同的红外特征;decaBDE热解过程可用三维扩散模型关联。进而通过对比分析decaBDE、PS和含decaBDE的阻燃PS样品的TG实验结果,发现阻燃塑料样品在热解时存在decaBDE与PS间的相互作用,表现为热解起始温度的降低和终止温度的升高。TG/IR分析表明:阻燃塑料样品的热解气相产物中不存在游离的HBr,decaBDE热解时产生的活性基团改变了PS的降解反应历程,使其气相产物具有与1,3-二苯基丁烷类似的红外特征。

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