Release and Transformation of BTBPE During the Thermal Treatment of Flame Retardant ABS Plastics.
Release and Transformation of BTBPE During the Thermal Treatment of Flame Retardant ABS Plastics.
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DOI：
10.1021/acs.est.8b05483
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发表时间：
2018-12
影响因子：
11.4
通讯作者：
Faqiang Zhan;Haijun Zhang;Rong Cao;Yun Fan;Pengjun Xu;Jiping Chen
中科院分区：
文献类型：
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作者：
Faqiang Zhan;Haijun Zhang;Rong Cao;Yun Fan;Pengjun Xu;Jiping Chen
在含有溴化阻燃剂（BFR）的工程塑料的生命周期中，不可避免地会出现热情景。然而，很少有关于嵌入式溴化阻燃剂在热处理过程中的命运的信息。在这项研究中，我们测量了一个典型的BFR，1，2-双（2，4，6-三溴苯氧基）乙烷（BTBPE）的释放和转化，在热处理的丙烯腈丁二烯苯乙烯（ABS）塑料。通过改变加热温度和气氛模拟了可能的热情景。BTBPE的最大释放速率出现在350 °C。建立了BTBPE在ABS中的释放动力学模型，探讨了BTBPE在ABS中的释放机理。物质相扩散被认为是释放过程中的速率决定步骤。根据所建立的释放模型，估计在ABS塑料的工业加工过程中，0.04-0.17%的嵌入式BTBPE可以释放到空气中。当加热温度≥350 °C时，约有15-56%的BTBPE分解为溴苯酚（BPs）和1，3，5-三溴-2-（乙烯氧基）苯（TBVOB），在350 °C时，分解遵循一级动力学。多溴二苯并对二恶英和多溴二苯并呋喃（PBDD/Fs）在≥350 °C时也通过前体机制由BPs和TBVOB大量生成。较高的温度（≥450 °C）有利于PBDF的形成。
Thermal scenarios inevitably occur during the lifecycle of engineering plastics laden with brominated flame retardants (BFRs). However, little information on the fate of embedded BFRs during the thermal processes is available. In this study, we measured the release and transformation of a typical BFR, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE), during the thermal treatment of acrylonitrile butadiene styrene (ABS) plastics. The possible thermal scenarios were simulated by varying the heating temperature and atmosphere. The maximum release rate of BTBPE was observed at 350 °C. A release kinetic model was developed to explore the mechanism of BTBPE release while heating ABS. Material-phase diffusion was found to be the rate-determining step during release. According to the developed release model, it was estimated that 0.04-0.17% of embedded BTBPE could be released to air during the industrial processing of ABS plastics. When the heating temperature was ≥350 °C, approximately 15-56% of embedded BTBPE decomposed to bromophenols (BPs) and 1,3,5-tribromo-2-(vinyloxy) benzene (TBVOB), and the decomposition followed a first-order kinetics at 350 °C. Polybrominated dibenzo- p-dioxins and dibenzofurans (PBDD/Fs) were also significantly formed at ≥350 °C from BPs and TBVOB via a precursor mechanism. A higher temperature (≥450 °C) was favorable for the formation of PBDFs.