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Synthesis of Poly-p-phenylene Terephthalamide (PPTA) in Ionic Liquids
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1021/acssuschemeng.7b03727
Sven Dewilde 1 , Tom Vander Hoogerstraete 1 , Wim Dehaen 1 , Koen Binnemans 1
Affiliation  

Several ionic liquids (ILs) were tested for their suitability to synthesize the aramid polymer poly-p-phenylene terephthalamide (PPTA) in an attempt to diminish the dependence on the toxic N-methylpyrrolidone (NMP) that is currently used in industry. The room-temperature IL 3-methyl-1-octylimidazolium chloride ([C8MIM][Cl]) showed the highest promise as, with this medium, the polycondensation reaction proceeds with a mechanism similar to how it occurs in the solvent mixture of NMP with CaCl2. With this IL, PPTA polymer with an inherent viscosity of 1.95 dL/g was obtained in a low-temperature polycondensation reaction. This is the highest reported molecular mass of PPTA to date that was obtained by polymerization in an ionic liquid. An extended X-ray absorption fine structure (EXAFS) and solid-state NMR spectroscopic study showed that [C8MIM][Cl] and the current industrial solvent of NMP and CaCl2 show similar characteristics when it comes to the synthesis of PPTA.

中文翻译:

离子液体中聚苯二甲酰对苯二甲酰胺(PPTA)的合成

测试了几种离子液体(ILs)的适用性,以合成芳族聚酰胺聚合物聚苯二甲酰对苯二甲酰胺(PPTA),以试图减少对目前工业上使用的有毒N-甲基吡咯烷酮(NMP)的依赖性。室温IL 3-甲基-1-辛基咪唑氯化物([C 8 MIM] [Cl])显示出最高的希望,因为在这种介质中,缩聚反应的发生机理与在NMP与氯化钙2。使用该IL,在低温缩聚反应中获得特性粘度为1.95dL / g的PPTA聚合物。这是迄今为止在离子液体中聚合获得的PPTA的最高分子量。扩展的X射线吸收精细结构(EXAFS)和固态NMR光谱研究表明[C 8 MIM] [Cl]与目前的NMP和CaCl 2工业溶剂在合成PPTA方面显示出相似的特性。
更新日期:2017-11-28
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