非等温热重法测定聚酰胺酸纤维亚胺化动力学参数

摘要

二步法制备聚酰亚胺时，亚胺化过程至关重要，可使聚酰胺酸脱水成为聚酰亚胺。该文对三元共聚得到的聚酰胺酸溶液进行湿法纺丝后的纤维进行了亚胺化动力学参数的测定，采用非等温热重法得到聚酰胺酸 TG 曲线，根据 Free-man-Carroll 动力学算法求算得到其亚胺化反应级数为一级，活化能为47．56 kJ /mol，频率因子 A 的自然对数为10．23。%When preparing polyimide by two-step method,imidization process is vital.The dynamic parameters of polyamide acid fibers which are prepared by wet spinning have been determined,and the TG curves are measured by non-isothermal thermogravimetry.According to Freeman-Carroll dynamics algorithm,it is found that the polyam-ide acid fibers have the reaction order of 1 ,activation energy of 47.56 kJ /mol and the natural logarithm frequency factor of 10.23.