Roles of anion of polyoxometalate-based ionic liquids in properties of intumescent flame retardant polypropylene
Roles of anion of polyoxometalate-based ionic liquids in properties of intumescent flame retardant polypropylene
复制标题
多金属氧酸盐基离子液体阴离子对膨胀型阻燃聚丙烯性能的影响
DOI：
10.1039/c4ra04592k
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发表时间：
2014-01-01
期刊：
影响因子：
3.9
通讯作者：
Su, Shengpei
中科院分区：
文献类型：
--
作者：
Chen, Shengjiao;Li, Juan;Su, Shengpei
制备了3种不同阴离子的聚氧乙烯酸盐离子液体（PIL）杂化材料，并将其引入到聚丙烯/膨胀型阻燃剂（PP/IFR）体系中，以提高其阻燃效率。结果表明，PIL中的阴离子对PP/IFR复合材料的阻燃性能有很大的影响。[BMIm] 3 PW（PIL 1）对PP复合材料的阻燃协同效应优于[BMIm]4SiW（PIL 3），[BMIm] 3 PMo（PIL 2）对PP/IFR复合材料的适用性最好。具有15wt%总量的PIL 2和IFR的PP复合物具有LOI 28.0并且通过UL-94 V-0测试而没有熔融滴下，而PP/IFR的LOI仅为23.7并且在相同含量下没有分级。残炭形貌分析表明，PIL 2促进了APP与PER之间的反应，促进了致密连续炭化层的形成，提高了聚炭程度，这是其阻燃性能优良的内在原因。然而，PIL 1和PIL 3对成炭行为显示出较差的协同作用。良好的炭层可以保护内部基体免受热和气体的侵蚀，从而产生良好的阻燃性能。
Three polyoxometalates-based ionic liquid (PIL) hybrid materials with different anions were prepared and introduced into polypropylene/intumescent flame retardants (PP/IFR) system to modify its flame retardant efficiency. It is found that the anions of PILs play great roles in the flame retardant properties of PP/IFR composites. The synergistic effect of [BMIm]3PW (PIL1) on the flame retardant properties of PP composites is better than that of [BMIm]4SiW (PIL3), and [BMIm]3PMo (PIL2) has the best suitability to PP/IFR composites. The PP composite with 15 wt% total amount of PIL2 and IFR has a LOI 28.0 and passes the UL-94 V-0 test without melt-dripping, while that for PP/IFR is only 23.7 and not classified at the same content. The morphology of char residue reveals that the PIL2 promotes the reaction between APP and PER, accelerates the formation of a compact and continuous charring layer and enhances the char accumulating degree that is the inherent reason for good flame retardant properties. However, PIL1 and PIL3 show poor synergistic effects on charring behavior. A good char layer can protect the inside matrix from the erosion of heat and gas, resulting in good flame retardant properties.