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Preparation and characterization of polyaniline with high electrical conductivity

机译：高电导率聚苯胺的制备与表征

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摘要

In the present paper, polyaniline (PANI) was polymerized by ammonium persulphate using a chemically oxidative process under mild tempertures ranging from -5-20℃. Electrical conductivity of as synthesized PANI got enhanced gradually owing to the increase in molecular weight and crystallinity with decrease in synthesis temperature. Extraction with tetrahydrofuran (THF) was employed as the purification method of emeraldine base (EB) to enhance the electrical conductivity of PANI effectively attributed to the removal of the low molecular weight fractions and defective molecular chains. Methanesulfonic acid (MSA) was used to dope EB due to its strong acidity and small molecular size, and the amount of dopant versus EB was also optimized. Using a novel "synergistic doping" process with m-cresol, electrical conductivity of PANI is further enhanced owing to more regular molecular chains which resulted in better interchain charge carriers' conduction. The emeraldine salts obtained finally have high electrical conductivity reaching up to 32.5 S cm{sup}(-1), which is much higher than that of the conventionally synthesized sample reported previously.
机译：在本文中，在-5-20℃的温和温度下，采用化学氧化法将过硫酸铵与聚苯胺（PANI）聚合。合成的PANI的电导率随着分子量和结晶度的增加而随合成温度的降低而逐渐提高。采用四氢呋喃（THF）萃取作为翡翠碱（EB）的纯化方法，可有效地提高PANI的电导率，这归因于低分子量级分和不良分子链的去除。甲磺酸（MSA）由于其强酸性和小分子尺寸而被用于掺杂EB，并且相对于EB的掺杂剂数量也得到了优化。使用具有间甲酚的新型“协同掺杂”工艺，由于更规则的分子链可改善链间电荷载流子的传导，从而进一步提高了PANI的电导率。最终获得的翡翠盐具有高达32.5 S cm {sup}（-1）的高电导率，这远高于先前报道的常规合成样品的电导率。

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