文献类型：期刊文献

中文题名：^(13)C核磁共振研究磺化脲醛树脂的反应机理

英文题名：Studies on the Reaction Mechanisms of Sulfonated Urea-Formaldehyde Resin by ^(13)C NMR

作者：李建法[1];宋湛谦[2];李芳[1]

机构：[1]绍兴文理学院化学系;[2]中国林业科学研究院林产化学工业研究所

年份：2005

卷号：24

期号：6

起止页码：37

中文期刊名：分析测试学报

外文期刊名：Journal of Instrumental Analysis

收录：CSTPCD、、北大核心2004、CSCD2011_2012、北大核心、CSCD

语种：中文

中文关键词：核磁共振;磺化脲醛树脂;反应机理

外文关键词：Nuclear magnetic resonance; Sulfonated urea - formaldehyde resin; Reaction mechanism

中文摘要：利用13C NMR数据证实了在低磺化剂用量下脲醛树脂的磺化改性仍可发生,并对磺化脲醛(SUF)树脂制备过程中的羟甲基化、缩合、磺化及缩聚等各步反应机理进行了探讨。明确了SUF树脂的13C NMR谱图中各峰位所对应的结构单元,认为3个未知峰的出现与磺化改性得到的一些新结构单元有关,并对它们的结构进行了推测。通过对比不同磺化和缩聚反应程度下得到的SUF产物的13C NMR数据,对磺化和缩聚反应后某些结构的出现和消失进行了解释。

外文摘要：It was confirmed with the ^13C NMR data that the sulfonation of urea - formaldehyde resin could still occur even at low dosage of sulfonating agent. The reaction mechanisms of hydroxymethylation, condensation, sulfonation and polycondensation in the resin preparation were investigated with these data. The ^13C NMR peaks of SUF resin were assigned to corresponding structural units, and three unknown peaks were considered to be related to some new structural units formed during the sulfonation, and their structures were suggested, The occurrence and disappearance of some structures after sulfonation and polycondensation were explained through comparing ^13C NMR data of different SUF products at different reaction stages and with different sulfonation degree.