【摘要】 <正> 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),室温条件下测定了更多还原

【Abstract】 A simple and quick method for the determination of the MWD of PPTA at room temperature by GPC is proposed The PPTA sample is dissolved in the mixed solvent (MS), Which is composed of HMPA, DMA and LiCl. DMA+3wt.% Lid is used as an eluent in GPC. The MWD of various kinds of PPTA samples, that were synthesized in different solvent systems and by different polycondensation ways, has been studied. It has been shown that the polydispersity is between the range of 1.8-3.0.更多还原