Promoting carbonization of polypropylene during combustion through synergistic catalysis of a trace of halogenated compounds and Ni2O3 for improving flame retardancy
Promoting carbonization of polypropylene during combustion through synergistic catalysis of a trace of halogenated compounds and Ni2O3 for improving flame retardancy
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通过微量卤化物和Ni2O3的协同催化促进聚丙烯燃烧过程中的碳化以提高阻燃性
DOI：
10.1016/j.polymer.2009.10.068
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发表时间：
2009-12
期刊：
影响因子：
4.6
通讯作者：
Song, Rongjun
中科院分区：
文献类型：
--
作者：
Gilman, Jeffrey W.;Yu, Haiou;Kashiwagi, Takashi;Liu, Jie;Tang, Tao;Jiang, Zhiwei;Song, Rongjun
研究了微量卤代化合物（如氯化铁、溴化铵）与Ni2O3颗粒的结合对聚丙烯（PP）燃烧过程中碳化的影响。结果表明，卤代化合物与 Ni2O3 的组合具有协同催化作用，可促进燃烧过程中残留炭的形成。促进机理研究表明，含卤添加剂释放的卤化物自由基作为催化剂加速PP降解产物的脱氢芳构化，促进降解产物在镍催化剂的催化下形成残炭。 GC和GC/MS结果证实卤代化合物可以加速PP降解产物的脱氢和芳构化。形貌观察表明，与PP/Ni2O3复合材料相比，PP/卤代化合物/Ni2O3复合材料的残余炭中形成了更长的纤维状结构。因此，微量卤代化合物的存在可以显着提高PP/Ni2O3复合材料的阻燃性能，这一点通过锥形量热仪测试得到证明。
The effect of combination between a trace of halogenated compounds (such as ferric chloride and ammonium bromide) and Ni2O3particles on the carbonization of polypropylene (PP) was investigated during combustion. The results showed a synergistic catalysis of combined halogenated compounds with Ni2O3in promoting the formation of the residual char during combustion. The investigation on the promotion mechanism showed that halide radical releasing from halogen-containing additives worked as a catalyst to accelerate dehydrogenation–aromatization of degradation products of PP, which promote the degradation products to form the residual char catalyzed by nickel catalyst. The results of GC and GC/MS confirmed that halogenated compounds could accelerate dehydrogenization and aromatization of degradation products of PP. The morphological observation showed that longer fiber-like structure was formed in the residual char of PP/halogenated compound/Ni2O3composites comparing with PP/Ni2O3composite. As a result, the presence of a trace amount of halogenated compounds could significantly improve the flame retardancy of PP/Ni2O3composites, which is proved by cone calorimeter tests.
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