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Catalytic effects of selected transition metal ions in the synthesis of lignosulfonic acid doped polyaniline

机译:精选过渡金属离子在木质素磺酸掺杂聚苯胺合成中的催化作用

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摘要

Lignosulfonic acid doped polyaniline (LIGNO-PANI) is a water-dispersible conducting polymer. The incorporation of dopants to achieve higher conductivities in addition to lignosulfonates during the polymerization process results in prohibitively long initiation times. A variety of transition metal ions including silver and ferrous ions were studied as potential catalysts for the reaction. Silver nitrate was found to have superior catalytic properties followed closely by ferrous sulfate heptahydrate. The effects of these ions on the synthesis of LIGNO-PANI with methanesulfonic acid (HMSA) as an additional dopant (MSA-LP) and on the synthesis of MSA-PANI were studied via potential profile monitoring. The LIGNO-PANI derivatives produced by the catalyzed reaction demonstrated no negative effects on the conductivity (10-15 S/cm) or dispersibility. In addition, residual metal analysis indicated that, although not much iron remained (< 0.01%) in the product, a large amount of silver was present (1.8%) in the final product. X-ray diffraction analysis was used to determine the identity of the silver containing moieties in the products. (c) 2005 Wiley Periodicals, Inc.
机译:木质素磺酸掺杂的聚苯胺(LIGNO-PANI)是一种水分散性导电聚合物。在聚合过程中,除了木质素磺酸盐外,为了达到更高的电导率而掺入掺杂剂会导致引发时间过长。研究了包括银和亚铁离子在内的多种过渡金属离子作为该反应的潜在催化剂。发现硝酸银具有优异的催化性能,其次是七水合硫酸亚铁。通过电位分布监测研究了这些离子对以甲磺酸(HMSA)作为附加掺杂剂(MSA-LP)合成LIGNO-PANI的影响以及对MSA-PANI合成的影响。通过催化反应产生的LIGNO-PANI衍生物对电导率(10-15S / cm)或分散性没有负面影响。此外,残留金属分析表明,尽管产品中铁的残留量不多(<0.01%),但最终产品中仍存在大量银(1.8%)。使用X射线衍射分析来确定产物中含银部分的身份。 (c)2005年Wiley Periodicals,Inc.

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