文献类型：期刊文献

中文题名：脲醛树脂预固化过程中分子质量分布的研究方法

英文题名：Research methods of molecular weight distribution during the pre-curing course of UF resin

作者：陈玉竹[1,2] 邵慧娟[1] 范东斌[2] 储富祥[2] 肖辉[1]

第一作者：陈玉竹

机构：[1]四川农业大学木材工业与家具工程高校重点实验室;[2]中国林业科学研究院木材工业研究所国家林业局木材科学与技术重点实验室

年份：2017

卷号：32

期号：2

起止页码：66-70

中文期刊名：热固性树脂

外文期刊名：Thermosetting Resin

收录：CSTPCD;;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

语种：中文

中文关键词：脲醛树脂;分子质量分布;预固化;凝胶色谱;基质辅助激光解析电离飞行时间质谱

外文关键词：urea-formaldehyde resin; molecular weight distribution ; pre-curing; GPC; MALDI-TOF MS

分类号：TF821

摘要：采用凝胶渗透色谱(GPC)和基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)两种方法研究了脲醛树脂在预固化过程中的分子质量变化。结果表明,在30 s预固化阶段树脂以低分子物质的增加为特征,大分子增加不显著;中等分子和大分子增加显著集中在30 s以后,该阶段是树脂网状结构的实质形成阶段。相比之下,在获得完整分子质量曲线的基础上,GPC能获得较为准确的相对分子质量分布;而MALDI-TOF MS能以完整的谱图数据准确直观地表征绝对分子质量的变化,并可根据分子质量的谱峰归属推断出相应的分子结构和反应机理。
The molecular weight changes during the pre-curing course of urea-formaldehyde resin were investigated by the gel permeation chromatography （GPC） and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry （MALDI-TOF MS）. The results indicated that the resin was characterized by the increase of low-molecular material and the increase of macromolecular was not significant at the 30 s pre-curing stage. The increase of middle molecular and macromolecular was significant after 30s and this stage was the real formation stage of resin network structure. The accurate molecular weight distribution could be obtained by GPC based on the complete molecular mass curve. By comparison, the absolute molecular mass changes could be accurately and intuitively characterized by MALDI-TOF MS with the complete spectrum data, and the corresponding molecular structure and reaction mechanism could be deduced according to the spectral peak attribution of molecular mass.