Preparation And Characterization Of Polyaniline And Its Composite Fiber

The emergence of the conductive polymer broke the traditional concept polymer was not conductive. Polyaniline (PANI), with cheap raw material, simple preparation technology, excellent performance of chemical and environmental stability, etc, had received especially attention in the family of conducting polymers. However, the insoluble and non-melting characteristics of PANI lead to processing difficulties, which seriously limited the application field of PANI. To overcome the shortcomings, methods of blending and template polymerization were mainly adopted to prepare PANI composite. In this paper, we got PANI composite by using the method of blend spinning preparation of PANI/viscose fiber (VCF) hybrid fiber and using the template preparation of PANI/polyimide (PI) composite fiber membrane. On the one hand we could take advantage of the PANI, which had excellent properties such as electrical, optical, magnetic, thermal, and expand the application fields of conductive polymers; On the other hand it was of great significance to explore more application domain of cellulose fiber and PI.The PANI/VCF hybrid fiber was prepared by alkali induced synthesis of PANI and the PANI put into viscose spinning dope and the wet spinning. Alkali induced synthesis of PANI was micro spherical, in order to ensure the progress of the wet spinning, the PANI should through 400 mesh sieve filter and particle size of 1 um or so. PANI was added to viscose spinning channel and it was a successful preparation of PANI/VCF hybrid fiber. The composite fiber thermal stability improved.The PANI/VCF hybrid fiber was prepared by hydrochloric acid doped synthesis of PANI and the PANI put into viscose spinning dope and the wet spinning. Hydrochloric acid doped PANI used ferrous ion and hydrogen peroxide as antioxidant. Electric potential of composite antioxidant system was lower and as prepared PANI particle size was smaller. The PANI was linear and the final result was micro rod under this condition. PANI was added into viscose spinning channel and it was a successful preparation of PANI/VCF hybrid fiber. The thermal stability composite fiber improved. As prepared PANI/VCF hybrid fiber had the effect of Cr(Ⅵ) adsorption, and the amount of adsorption increased with PANI content and ionic liquid concentration increased.The conductive PANI/PI composite fiber membrane was prepared with PI composite fiber membrane as a template. PI dissolved in N, N-dimethyl formamide and PI fiber membrane was prepared by solutionspinning. Dodecylbenzene sulfonic acid (DBSA) was the doping agent in the preparation of PANI/PI composite fiber membrane materials. We explored the effect of reaction conditions on properties of composite materials, obtain the best technology conditions as follows:concentration of ANI was 0.15 mol/L, the APS concentration was 0.1 mol/L, DBSA concentration was 0.3 mol/L, the reaction time was 18 h, the reaction temperature was 0 ℃. PANI was evenly coated on the PI fiber membrane. PI composite fiber membrane thermal stability improved. The conductivity of composite membrane could be up to 3.83 X 10 S/cm. The composite fiber membrane had good pH response characteristics, which was green under the condition of acid and blue in alkaline condition. As prepared PANI/PI composite fiber membrane had the effect of Cr (Ⅵ) adsorption, and the amount of adsorption increased with adsorption time and ionic liquid concentration increased.