APS/NaClO复合氧化剂对乳液法合成聚苯胺的微观形貌及其电化学性能的影响

摘要

Conductive polyaniline（PANI） was prepared by emulsion polymerization with ammonium persulfate（APS） and sodium hypochlorite（NaClO） as composite oxidant.Whether add the NaClO or not,the morphology and electrochemical properties（cyclic voltammogram and electrical conductivity） of PANI were discussed.Moreover,the effect of the concentrations of APS,sodium dodecylbenzenesulfonate（SDBS） and NaClO on electrochemical properties of PANI was discussed.The experimental results showed that NaClO had an important effect on the morphology of PANI.Compared with the PANI synthesized by APS alone,the PANI synthesized by APS and NaClO composite oxidant has higher redox peak current and higher conductivity（which is about 2.6 times the former）.The optimal properties of PANI was achieved when the molar ratio of aniline（An） to APS was 8∶7,the molar ratio of An to SDBS was 10∶4 and NaClO was 5%（w）.UV-Vis and FT-IR indicated that the structure of PANI synthesized by composite oxidant was similar to the PANI synthesized by APS alone.%采用乳液法,以过硫酸铵（APS）和次氯酸钠（NaClO）为复合氧化剂合成导电聚苯胺（PANI）.考察了NaClO的加入与否对PANI微观形貌与电化学性能（循环伏安和电导率）的影响,以及APS、乳化剂十二烷基苯磺酸钠（SDBS）和NaClO的用量对PANI电化学性能的影响.结果表明：NaClO的加入对PANI的微观取向结构具有重要的影响.与采用单一APS合成的PANI相比,复合氧化剂合成的PANI具有较高的循环伏安峰电流以及更加优异的电导率（约为前者的2.6倍）.当苯胺（An）与APS的物质的量比（nAn∶nAPS）为8∶7,An与SDBS的物质的量比（nAn∶nSDBS）为10∶4,NaClO用量为5%（质量分数）时,PANI的各项性能指标达到最好;紫外可见光谱和红外光谱的表征结果表明,采用复合氧化剂并未对PANI的分子结构产生明显的影响.