聚苯胺在芳纶Ⅲ表面的原位聚合及产物吸波性能研究

In-situ polymerization of polyaniline on the surface of aramid fiberⅢand its microwave absorption property

分别以对甲苯磺酸(PTSA)和盐酸(HCl)掺杂的聚苯胺(PANi)膜在芳纶Ⅲ(F3)表面原位聚合,制备了F3表面原位合成有PTSA掺杂PANi的复合纤维(PTSA-PANi/F3)和F3表面原位合成有HCl掺杂PANi的复合纤维(HCl-PANi/F3),分析了两种合成产物的宏观性状、微观结构与形貌,并在此基础上提出PANi在F3表面的原位合成过程与机理,最后对合成产物的电磁学和吸波性能进行了深入研究。结果表明:PANi膜层与F3之间除了物理吸附作用以外,还存在氢键结合;PANi在F3表面的负载未对F3的结晶结构产生明显影响;由于氧化程度不同,两种PANi/F3产物呈现出一定的颜色差异,PTSA-PANi/F3呈墨绿色,HCl-PANi/F3呈灰黑色;PANi在F3表面的生长机理为按有序刷子状方式沉积而形成膜层结构;相对于原料F3,两种PANi/F3产物的介电损耗和磁损耗能力都得到了明显的提升,在8~12 GHz频段,两种产物均表现出优于F3的吸波性能,其中HCl-PANi/F3产物的吸波性能最为优异。

Polyaniline(PANi)films doped with p-toluenesulfonic acid(PTSA)or hydrochloric acid(HCl)were in-situ synthesized on the surface of aramid fiber III(F3),respectively,to produce PTSA-PANi/F3 and HCl-PANi/F3 composite fibers.The macroscopic properties,microstructure and morphology of the two synthetic products were analyzed.On this basis,the in-situ synthesis process and mechanism of PANi on F3 surface were proposed.And the electromagnetic and microwave absorption properties of the synthesized products were studied.The results showed that there was also hydrogen bonding between PANi film and F3 in addition to physical adsorption;the loading of PANi on F3 surface had no obvious effect on the crystal structure of F3;the two PANi/F3 products showed color difference due to the different oxidation degree,namely dark green PTSA-PANi/F3 and gray black HCl-PANi/F3;the growth mechanism of PANi on F3 surface was the formation of film structure by orderly brush deposition;compared with the raw material F3,the two PANi/F3 products showed the dielectric loss and magnetic loss significantly improved and better microwave absorption property in the frequency band of 8-12 GHz,and the HCl-PANi/F3 product had the best microwave absorption property.