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摘要
为了获得基于甲基八溴醚高效率阻燃聚苯乙烯(PS)复合体系,探索了甲基八溴醚(MOBE)与联枯复配阻燃PS行为规律。结果表明:联枯的加入能使MOBE在3%的添加量下显著地提升阻燃PS复合材料的极限氧指数(LOI)值,3% MOBE/0.3%联枯/PS的LOI值达到26.1%;在垂直燃烧实验(UL94)测试中,联枯的引入能够赋予PS“离火自熄”的特性。锥形量热仪测试结果表明,3% MOBE能够在一定程度上降低PS燃烧过程中的热释放速率峰值(PHRR),在0.3%联枯加入后则进一步使PHRR值下降了37%。在对二者协同阻燃机理的研究中发现,联枯对基体主链降解的促进作用,降低了PS复合材料的热稳定性,使PS在燃烧时能够将热量以熔滴的形式带走,减少可燃性分解产物的数量,使MOBE呈现更好的阻燃效果。上述结果表明,MOBE与联枯复合体系对于PS具有良好的协同阻燃效果。
Abstract
In order to obtain a highly efficient methyloctabromoether (MOBE)/flame retardant polystyrene (PS) composite system,the behavior of MOBE compounded with 2,3-dimethyl-2,3-diphenylbutane (DMDPB) for flame retardant PS was explored.The results exhibited that the addition of DMDPB could significantly enhanced the limited oxygen index (LOI) value of flame retardant PS composites when the addition of MOBE was 3%,and the LOI value of 3% MOBE/0.3% DMDPB/PS reached 26.1%.The addition of the DMDPB could imposed “self-extinguishing” properties to PS in the vertical combustion test (UL94).The cone calorimeter test results showed that the addition of 3% MOBE was able to reduce the peak of heat release rate (PHRR) of PS during combustion to some extent.On the base of 3% MOBE addition,the additional added 0.3% DMDPB further reduced the PHRR value by 37%.In the study of the synergistic flame retardant mechanism of MOBE and DMDPB,it was found that the promotion effect of DMDPB on the degradation of the matrix backbone reduced the thermal stability of PS composites,and enabled PS to carry away the heat in the form of molten droplets during combustion,and also reduced the amount of combustible decomposition products,which made MOBE have a better flame retardancy.
关键词
甲基八溴醚
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联枯
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聚苯乙烯
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协同阻燃效果
Key words
synergistic mechanism
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methyloctabromoether
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2,3-dimethyl-2,3-diphenylbutane
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polystyrene
甲基八溴醚提效阻燃聚苯乙烯的性能与机理研究[J].
化工新型材料, 2023, 51(5): 164-169 DOI:10.19817/j.cnki.issn1006-3536.2023.05.030
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基金资助
山东省重点研发计划(2020CXGC011207)
