A new approach to improving flame retardancy, smoke suppression and anti-dripping of PET: Via arylene-ether units rearrangement reactions at high temperature
作者:De-Ming Guo、Teng Fu、Chao Ruan、Xiu-Li Wang、Li Chen、Yu-Zhong Wang
DOI:10.1016/j.polymer.2015.09.016
日期:2015.10
and the content of PBPBD. Py-GC/MS results showed that the PBBPD structural units undergo rearrangement reactions at high temperature, and ultimately form conjugated heteroaromatic structures, which lead to the formation of stable char residues with unique “stick-shaped” micro-morphology. Due to these rearrangement reactions, BDxPETs showed an expected flame retardant performance and a reduction in smoke
为了避免常规磷阻燃剂引起的严重熔滴问题,一种名为2,2'-(4,4'-(1,4-亚苯基双(氧基))双(4,合成了1-亚苯基))双(氧基)二乙醇(PBPBD),并通过缩聚将其引入到PET主链中。通过引入亚芳基醚单元,热稳定性和含有PBPBD的无阻燃剂共聚酯燃烧产生的残炭(BD xPETs)急剧增加。然而,这些共聚物的结晶度和熔融温度低于PET的相同量。使用Ozawa-Flynn-Wall方法研究了热降解动力学,结果表明,随着转化率和PBPBD含量的增加,分解共聚酯的表观活化能得到增强。Py-GC / MS结果表明,PBBBD结构单元在高温下会发生重排反应,并最终形成共轭杂芳族结构,从而形成具有独特“棒状”微观形态的稳定炭渣。由于这些重排反应,BD xPET表现出预期的阻燃性能,并减少了燃烧过程中产生的烟雾。例如,BD 10 PET的LOI值为28.4,总烟雾量(TSP)为10.4 m 2,远小于PET的18