丙烯酰胺水溶液聚合中回咬现象的电子顺磁共振研究
EPR Study of Backbiting in the Aqueous-Solution Polymerization of Acrylamide.
作者信息
Kattner Hendrik, Buback Michael
机构信息
Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstr. 6, D-37077, Göttingen, Germany.
出版信息
Macromol Rapid Commun. 2015 Dec;36(24):2186-91. doi: 10.1002/marc.201500479. Epub 2015 Oct 21.
Via electron paramagnetic resonance (EPR) spectroscopy, the type of radicals occurring during acrylamide (AAm) homopolymerization in aqueous solution is investigated between -5 and +100 °C. The radicals are produced photochemically under stationary conditions. Midchain AAm radicals (MCRs) are clearly identified by EPR which demonstrates that secondary propagating AAm radicals (SPRs) undergo backbiting reactions. Above 50 °C, the fraction of MCRs even exceeds the one of SPRs. The extent of backbiting is however well below the one in butyl acrylate polymerization at identical temperature.
通过电子顺磁共振（EPR）光谱法，研究了在-5至+100°C之间水溶液中丙烯酰胺（AAm）均聚过程中产生的自由基类型。自由基是在固定条件下通过光化学产生的。EPR清楚地识别出链中AAm自由基（MCRs），这表明二级增长的AAm自由基（SPRs）会发生回咬反应。在50°C以上，MCRs的比例甚至超过了SPRs。然而，在相同温度下，回咬的程度远低于丙烯酸丁酯聚合中的程度。
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