材料期刊网

采用界面缩聚法制备了聚间苯二甲酰间苯二胺（PMIA），并通过红外、热重和凝胶渗透色谱（GPC）等方法与传统的低温溶液缩聚法制得的聚合物进行了比较。界面缩聚法制得的聚合物与低温溶液缩聚法制得的聚合物结构一致，但是界面缩聚法制得的PMIA聚合物的热稳定性稍好一些，最大分解速率对应的温度（界面缩聚：452℃，低温溶液缩聚：448℃）；且具有分子量分布更窄小的优点（界面缩聚：2．25，低温溶液缩聚：2．87）。通过扫描电镜（SEM）对聚合物制得的纤维表面进行分析，结果表明，采用界面缩聚法制得的PMIA纤维缺陷较少，有利于得到高品质的纤维。

Poly(m-phenylene isophthalamide) (PMIA) was prepared by the interracial polycondensation. PMIA was compared with the polymer which was produced by the traditional low temperature solution polycondensation through FT-IR,TG-DTG and GPC. The polymers made by the interracial polycondensation has the same structure with that made by the low temperature solution polycondensation, while it has the better thermal stability and narrow molecular weight distribution. The temperature corresponding to the maximum decomposition rate is 452 ℃ for the polymer made by interracial polycondensation, 448℃ for that made by low temperature solution polycondensation. The molecular weight distribution is 2.25 for the PMIA made by interracial polycondensation, 2.87 for that made by low temperature solution polycondensation. After analyzing the fiber surface of the polymer by SEM, it shows that the PMIA fiber made by the interracial polycondensation has fewer defects and is advantage to get high quality fiber.