Synergistic effects of dual imidazolium polyoxometalates on intumescent flame retardant polypropylene
Synergistic effects of dual imidazolium polyoxometalates on intumescent flame retardant polypropylene
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双咪唑多金属氧酸盐对膨胀型阻燃聚丙烯的协同作用
DOI：
10.1002/app.45491
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发表时间：
2017-11
影响因子：
3
通讯作者：
Li Juan
中科院分区：
文献类型：
--
作者：
Wang Chengle;Wang Zhijing;Li Juan
The role of dual imidazolium polyoxometalates (POMs) in the flame retardancy of polypropylene/intumescent flame retardant (PP/IFR) composites was studied. The results showed that the structures of dual imidazolium POMs have a great effect on the flame retardancy of PP composites. The dual imidazolium POMs based on an ethyl group (EMIPMA) obtain the best flame retardant efficiency. With 15.5 wt % IFR and 0.5 wt % EMIPMA, the PP composites reach a limiting oxygen index of 25.7 and the UL-94 V-0 standard. However, the dual imidazolium POMs containing a butyl (BMIPMA) or hexyl (HMIPMA) group cannot achieve the UL-94 V-0 standard at the same formulation. Dual imidazolium POMs not only promote the formation of good char, but also induce the formation of intumescent char with a hierarchical and microporous structure that helps to prevent gas and heat from transferring from the flame to the resin. Therefore, the flame retardancy of PP/IFR composites is improved. However, excessive combustible components produced by BMIPMA or HMIPMA deteriorate the flame retardancy of PP/IFR composites. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45491.
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