对位芳纶纤维的多巴胺仿生修饰及硅烷偶联剂二次功能化

Functionalization on Poly-p-phenylene terephthamide Fiber Using Bioinspired Dopamine Deposition and Silane Coupling Agent

研究采用多巴胺仿生修饰和硅烷偶联剂二次功能化的新方法对对位芳纶纤维进行表面改性。多巴胺首先氧化自聚,形成聚多巴胺包覆在纤维表面,以提供功能化平台。二次功能化硅烷偶联剂单体接枝到纤维表面的聚多巴胺层,在纤维表面引入有助于提高粘合性能的表面官能团。整个表面改性过程简单,无毒和可控。表面改性后的对位芳纶纤维/橡胶复合材料的H抽出力提高了69%,高温老化后粘合力保持率也显著提升。

In this study,poly-p-phenyleneterephthamide（PPTA） fibers were modified by bioinspired dopamine deposition and silane coupling agent functionalization.Poly（dopamine）（PDA）,formed through the oxidative self-polymerization of dopamine,was deposited on the surface of PPTA fibers and acted as a secondary functionalization plate.The silane coupling agent was then grafted to the surface of PDA coated PPTA fibers,introducing adhesion active groups onto the surface of the fibers.The whole surface modification process was facile,non-toxic and controllable.The modified PPTA fibers achieved an increase of 69%in the pull out force with rubber matrix.The adhesion property after high temperature aging was also improved markedly.