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Solid-state magnetic resonance studies of polyaniline as a radical scavenger

机译：聚苯胺作为自由基清除剂的固态磁共振研究

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摘要

The first detailed study of polyaniline (PANI) and reduced PANI (R-PANI) before and after reaction with the stable organic free radical 1,1-diphenyl-2-picrylhydrazyl (DPPH) by using solid-state C-13 CP MAS (cross-polarization magic-angle spinning), NQS (nonquaternary suppressed) and CPPI (cross-polarization phase inversion) nuclear magnetic resonance techniques is reported. These techniques reveal relatively subtle structural changes that occur upon reaction with DPPH free radicals and confirm the radical scavenging ability of PANI. The integrated intensity of the PANI CP MAS spectrum after reaction with DPPH is about 8% larger than that of PANI and this cannot be explained by an oxidation process alone. The increase is attributed to a decrease in the polaron concentration in the polymer, which is consistent with electron paramagnetic resonance (EPR) data that show a decrease of the EPR signal intensity after reaction of chemically synthesized PANI with DPPH.
机译：通过使用固态C-13 CP MAS对聚苯胺（PANI）和还原的PANI（R-PANI）与稳定的有机自由基1,1-二苯基-2-吡啶并肼基（DPPH）进行反应之前和之后的首次详细研究（报道了交叉极化魔角旋转），NQS（非四元抑制）和CPPI（交叉极化相位反转）核磁共振技术。这些技术揭示了与DPPH自由基反应后发生的相对微妙的结构变化，并证实了PANI的自由基清除能力。与DPPH反应后，PANI CP MAS光谱的积分强度比PANI高约8％，这不能仅通过氧化过程来解释。该增加归因于聚合物中极化子浓度的降低，这与电子顺磁共振（EPR）数据一致，该数据表明化学合成的PANI与DPPH反应后EPR信号强度降低。

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