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聚对苯二甲酰对苯二胺(PPTA)是一种刚性棒状高分子,一般仅溶于浓硫酸,氢氟酸等强酸溶剂。凝胶渗透色谱(GPC)测定PPTA分子量分布,国内外报道不多。Schaefgan等报道了在DMA-4Wt.％LiCl中测定的PPTA分子量分布图谱,但溶剂和具体测试方法未作介绍。Arpin等用96％硫酸作溶剂,在简易GPC装置上进行了测定。国内赵择卿等采用与Arpin相同的方法进行了测试,本文采用混合有机溶剂溶解PPTA,以DMA-3Wt.％LiCl作淋洗液,在HITACH 635-TR HPLC仪GPC附件上,用50厘米长、内径8毫米的分析柱,紫外吸收检测(波长λ=330nm),室温条件下测定了
Poly-p-phenylene terephthalamide (PPTA) is a rigid rod-shaped polymer, generally soluble in concentrated sulfuric acid, hydrofluoric acid and other strong acid solvents. Gel permeation chromatography (GPC) determination of PPTA molecular weight distribution, few reports at home and abroad. Schaefgan et al. Reported the PPTA molecular weight distribution profile measured in DMA-4Wt.% LiCl, but the solvent and specific test methods were not described. Arpin and other 96% sulfuric acid as a solvent, was measured on a simple GPC device. Zhao and other domestic use of the same method with Arpin was tested in this paper mixed solvent dissolved PPTA, DMA-3Wt.% LiCl as eluent, HITACH 635-TR HPLC GPC accessories, with 50 cm long, inner diameter 8 mm analytical column, UV absorption detection (wavelength λ = 330nm), measured at room temperature