【摘要】 采用性能相同的聚对苯二甲酰对苯二胺(PPTA)原料在双螺杆中进行溶解实验,通过红外和热失重测试分析测定溶解过程对PPTA结构以及热性能的影响.分析溶解时间、温度、溶液质量分数、硫酸质量分数、双螺杆转速等溶解条件对PPTA的比浓对数黏度ηinh、相对分子质量的影响.实验结果表明,整个溶解过程中的各种影响因素对PPTA的比浓对数黏度均有负面影响,PPTA会发生部分的降解.更多还原

【Abstract】 The same poly(p-phenylene terephthalamide)(PPTA)powder was dissolved by twin screw.The effects of dissolving on the structure and thermal properties of PPTA through IR spectra and TG were studied and the inherent viscosity and its relative molecular weight of PPTA solution with the influence of kinds of factors including dissolution time,solution temperature,concentration of the solution,concentration of strong sulfuric acid and stirring speed of twin screw were discussed.The results showed the decrease of the ηinh(inherent viscosity)of PPTA throughout the resolving process,and some PPTA polymer had been degraded.更多还原