掺杂/脱掺杂诱导的聚苯胺织物浸润性开关

DOPING/DEDOPING PROCESS INDUCED WETTABILITY SWITCHING OF POLYANILINE-COATED CONDUCTIVE TEXTILE

以三氟乙酸(TFA)作为掺杂剂,三氯化铁为氧化剂,采用原位化学氧化法制得了具有超疏水性能的聚苯胺/棉布复合导电织物(PANI/CCT),所得织物在外界酸度诱导下发生掺杂/脱掺杂反应而导致其由导电态向绝缘态的转变,从而实现超疏水到超亲水的可逆、快速变化.研究结果证实上述的超疏水/超亲水可逆的变化来自聚苯胺与纤维的微/纳米结构和TFA的低表面自由能的协同效应.

Polyaniline-coated conductive cotton textile（PANI/CCT） with superhydrophobic function was prepared via an in situ polymerization of aniline in the presence of trifluoroacetic acid（TFA） as the dopant and FeCl_3 as the oxidant.The SEM results present that the PANI nano-particles with diameter of about 200 nm evenly spread over on the surface of cotton fabrics with diameter of 10~20 μm.The structure characterizations further indicate that the cotton cellulose has certain doping function to the PANI,and there is a stronger chemical combination formed between them in the process of in situ polymerization than that in common coating.The contact angle of the PANI/CCT prepared at / = 0.34 is found as high as 160.5°.It is proposed that the supper-hydrophobic function of the PANI/CCT results from synergetic effect of co-existence of micro/nanostructures with a low surface energy of TFA.Moreover,wettability of the PANI/CCT is reversibly varied from super-hydrophobic to super-hydrophilic induced by a doping with TFA and dedoping with ammonia gas,exposing a promising property for preparing acidity-controlled wettability switching.