At present, the mechanical properties of para aramid paper (PPTA paper) are still severely challenged since interface bonding defects. In this work, a novel method for improving the interface bonding of PPTA paper was proposed by introducing m-phenylenediamine (MPD) into PPTA molecular chain by copolymerization. Result showed that the addition of MPD could monitor the rigidity and glass transition temperature (Tg) of PPTA. The Tg generated by the copolymerized modified PPTA precipitated fibers (MAPFs) realized micro-melting bonding with adjacent fibers during hot-pressing process. Further optimization of MAPFs precipitation and hot-pressing process improved the tensile strength of paper. Results indicated that the tensile strength of paper made of MAPFs with 60% MPD far beyond PPTA paper (PAP), and was 1.07 times of Nomex paper. The method provides a reference value for the application of high performance PAP in lightweight and high strength fields, broadening the application field of PAP as well.

目前，对位芳纶纸（PPTA纸）的机械性能仍因界面结合缺陷而受到严峻挑战。本工作提出了一种通过共聚将间苯二胺（MPD）引入到PPTA分子链中来改善PPTA纸界面粘合的新方法。结果表明，MPD的添加可以监测PPTA的刚性和玻璃化转变温度（Tg）。共聚改性PPTA沉淀纤维（MAPFs）产生的Tg在热压过程中实现了与相邻纤维的微熔融粘合。进一步优化MAPFs沉淀和热压工艺，提高了纸张的拉伸强度。结果表明，MPD为60%的MAPFs制成的纸张的拉伸强度远远超过PPTA纸（PAP），是Nomex纸的1.07倍。该方法为高性能PAP在轻质高强领域的应用提供了参考价值，也拓宽了PAP的应用领域。