草酸掺杂磺化聚苯胺/多壁碳纳米管复合材料的制备与性能

Preparation of SPAN/MWCNT composites and its properties

聚苯胺(polyaniline,PANI)磺化后,可显著提高水溶加工性,具有重要工业应用价值,目前的关键是如何获得高导电性的磺化聚苯胺(sulfonatedpolyaniline,SPAN)。本文以多壁碳纳米管(MWCNTs)作为导电添加剂,草酸作为掺杂剂,采用溶液中的化学氧化聚合法制得了具有核-壳结构的聚苯胺(PANI)包覆多壁碳纳米管(MWCNT)复合材料后,再对其进行氯磺化,得到了具有良好导电性的SPAN包覆MWCNT复合材料。紫外-可见光谱研究发现,MWCNT与SPAN之间存在着静电相互作用,稳定了SPAN分子链中的共轭作用,增强了共轭长度。性能测试表明该复合材料的电导率可达到4.45S/cm,比相同方法制备的SPAN高出约5个数量级;在水溶液中的溶解度约为1mg/mL,采用过滤的方法获得了一层均匀且光滑的黑色薄膜,表明其具有优异的成膜性。

The sulfonated polyaniline （SPAN） with good solubility and processibility has many potential applications in industry. A large hurdle is how to improve its electrical properties. In this paper, multi-walled carbon nanotubes （MWCNTs） were used as conductive fillers to improve the conductivity of SPAN. The highly conductive SPAN/MWCNT composites were prepared by chemical oxidation polymerization using oxalic acid as dopant and then sulfonating with chlorosufonic acid. The UV- Vis spectrum of the composite demonstrates that electrostatic interaction exists between MWCNTs and SPAN molecular chain, which might increase the conjugation length of SPAN. The composite has a good conductivity of 4. 45 S/cm, which is nearly 5 orders of magnitude higher than sulfonated polyaniline （SPAN） obtained by the same chemical oxidation polymerization method. The composite has good water solubility of 1 mg/mL and can form uniform and glazed film through vacuum filtration.