聚吡咯涂覆型导电纸导电性能的进一步改善

在纸浆纤维悬浮液体系中通过原位聚合法制备了聚吡咯涂覆型导电纸,对其导电性进行了进一步的研究。将三氯化铁与磺基水杨酸以物质的量之比1:1的比例络合生成磺基水杨酸合铁,代替三氯化铁作氧化剂制得的导电纸的导电性及环境稳定性都有所提高。此时,磺基水杨酸不仅与铁离子络合,也起到掺杂的作用,且无需再加对甲苯磺酸为掺杂剂就能获得良好导电性的纸张。电镜及电镜能谱分析结果表明,不同氧化剂和掺杂剂制备的试样图像亮度及掺杂水平有明显差异。由于对甲苯磺酸铁的氧化能力较弱,故使用这一络合物作氧化剂兼掺杂剂并不能得到导电性能优异的纸张。此外,模拟纸浆贮存这一生产过程,将反应后的浆料贮存不同时间,发现水对导电纸的导电性能并无显著负面影响。

Further Improvement of the Conductivity of Polypyrrole-coated Conductive Paper

In this study,electrically conductive paper was prepared by in situ polymerization of pyrrole in pulp suspension to further understand the conductivity of polypyrrole-coated conductive paper.The iron(III) sulfosalicylate complex genereated by adding 5-sulfosalicylic acid solution to ferric chloride solution was used as a mild oxidant to replace ferric chloride.The conductivity and environmental stability of the samples prepared with the mild oxidant were improved to a certain degree.It was found that 5-sulfosalicylic acid did not only complex with ferric ions,but also act as dopant.In fact,p-toluenesulfonic acid used as dopant seems to be unnecessary.SEM and EDX analysis results showed that there were significant differences in the image brightness and doping levels of the samples prepared by different oxidant and dopant.Using purchased iron(III) p-toluenesulfonate as both oxidant and dopant could not obtain the polypyrrole-coated conductive paper with good conductivity and environmental stability perhaps due to the low oxidizing ability of this compound.In addition,the effect of water during pulp storage operation on the conductivity was investigated.The results showed that pulp storage operation had no obvious negative influence on the conductivity of polypyrrole-coated paper.