【摘要】 在对位芳纶中引入2-(4-氨基苯基)-5-氨基苯并咪唑(BIA)结构，采用低温溶液缩聚法得到溶解性良好的芳纶聚合物，将聚合液脱泡处理后进行湿法纺丝，得到芳纶初生纤维。研究聚合反应条件对芳纶聚合物的相对分子质量、初生纤维的表面形貌及其力学性能的影响，从而确定了最佳的聚合反应条件。研究结果表明：对苯二胺与BIA的物质的量比为5∶5、LiCl质量分数为4%、固含量为8%时为最佳聚合反应条件，在此条件下合成得到的聚合物分子质量较高，在溶剂中不易发生降解，聚合液具有优异的稳定性；经湿法纺丝后可以制得表面光滑、力学性能较高的芳纶初生纤维。更多还原

【Abstract】 The 2-(4-aminophenyl)-5-aminobenzimidazole(BIA) structure was introduced into the para-aramid, and the aramid polymer with good solubility was obtained by low-temperature solution polycondensation method, and the polymerization solution was deaerated and wet spun to obtain as-spun aramid fibers.The effects of polymerization reaction conditions on the relative molecular weight of aramid polymers, surface morphology and mechanical properties of as-spun fibers were studied, and the optimal polymerization reaction conditions were determined. The results show that the optimal polymerization reaction conditions are the molar ratio of p-phenylenediamine to BIA of 5∶5, mass fraction of 4% LiCl, and solid content of8%. The polymer synthesized under these conditions has a relatively high molecular weight, which is not easily degraded in solvents, and the polymerization solution has excellent stability. After wet spinning, asspun aramid fibers with smooth surface and high mechanical properties can be produced.更多还原