Experimental evidence for hydrogen bonding in polyaniline: Mechanism of aggregate formation and dependency on oxidation state
Experimental evidence for hydrogen bonding in polyaniline: Mechanism of aggregate formation and dependency on oxidation state
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DOI：
10.1021/ma9700136
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发表时间：
1997-05
期刊：
影响因子：
5.5
通讯作者：
W. Zheng;M. Angelopoulos;A. J. Epstein;A. MacDiarmid
中科院分区：
文献类型：
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作者：
W. Zheng;M. Angelopoulos;A. J. Epstein;A. MacDiarmid
通过GPC在N-甲基-2-吡咯烷酮（NMP）溶液中观察到的未掺杂的聚苯胺（祖母绿碱（EB））中的聚集被发现与未掺杂的聚合物中亚胺氮原子的分数密切相关，即，聚合物的氧化态。由于EB被还原为leucoemeraldine碱（LEB），聚集程度显着降低。凝胶渗透色谱（GPC）和红外光谱研究的结果表明，聚合物的聚集是由于相邻的聚合物分子上的亚胺和胺氮位点之间的链间氢键。聚合物中发现的氢键结合程度和聚集程度受溶剂、LiCl和聚合物的氧化态的影响很大。
Aggregation in the nondoped polyaniline, emeraldine base (EB), as observed by GPC in a N-methyl-2-pyrrolidinone (NMP) solution, was found to be closely related to the fraction of the imine nitrogen atoms in the nondoped polymer, i.e., to the oxidation state of the polymer. As EB was reduced to leucoemeraldine base (LEB), the degree of aggregation was significantly reduced. The results of gel permeation chromatography (GPC) and infrared studies suggest that the aggregation of the polymer is due to interchain hydrogen bonding between the imine and amine nitrogen sites on adjacent polymer molecules. The degree of hydrogen bonding and, thus, aggregation found in the polymer is greatly affected by solvents, LiCl, and the oxidation state of the polymer.