苯胺和邻氨基酚共聚的原位紫外-可见光谱电化学研究  

In Situ UV-Vis Spectroelectrochemical Investigation of the Copolymerization of o-Aminophenol with Aniline

作　　者：张春花[1] 张雷[1] 

机构地区：[1]上海师范大学生命与环境科学学院化学系,上海200234

出　　处：《分析化学》2009年第3期373-377,共5页Chinese Journal of Analytical Chemistry

基　　金：上海市重点科学(No.T0402);上海师范大学(No.SK200719)资助课题

摘　　要：采用原位紫外-可见吸收光谱法研究了苯胺(AN)和邻-氨基酚(OAP)在0.5mol/LH2SO4溶液中的电化学共聚过程。结果表明,在AN和OAP的共聚过程中,OAP首先被氧化生成其阳离子自由基,对应于460nm处的吸收峰,然后OAP阳离子自由基与继而生成的AN阳离子自由基和溶液中的AN和OAP单体发生交互反应,生成混合二聚物中间体,对应于490nm处的吸收峰,此混合二聚物中间体再继续反应生成中性低聚物,对应于波长小于460nm处的吸收峰。在研究不同浓度比的AN和OAP进行电化学共聚时发现,当溶液中OAP浓度增大时,对AN的聚合会产生抑制作用。The electrochemical copolymerization of o-aminophenol （OAP） with aniline （AN） in 0.5 mol/L H2SO4 has been investigated using in situ UV-Vis spectroeleetrochemistry. The results reveal that OAP can be firstly oxidized to its cation radical,which shows a peak at λ =460 nm in the UV-Vis spectra. Then a mixed dimmer intermediate is formed through the cross-reaction of OAP and AN cation radicals with their monomers in solution. The absorption peak at λ = 490 nm in the UV-Vis spectra is assigned to this intermediate. The intermediates then react each other to form the oligomer which shows an absorption peak at A 〈 460 nm. On the other hand, the speetroelectrochemical results reveal that OAP can inhibit the polymerization of AN with the increase of the amount of OAP in the mixed solutions.

关 键 词：苯胺 邻-氨基酚 电化学共聚 原位紫外-可见光谱电化学 

分 类 号：O631.3[理学—高分子化学]