森林与环境学报2017，Vol.37Issue(2)：251-256,6.DOI:10.13324/j.cnki.jfcf.2017.02.021
碱催化三聚氰胺甲醛体系中的竞争关系
Study on the competitive relationships of the base-catalytic melamine formaldehyde system
摘要
Abstract
The hydroxymethylation mechanism of melamine (M) and the competitive relationships of the polycondensation structure for the base-catalytic melamine-formaldehyde (MF) system were investigated via using electrospray ionization mass spectromete (ESI-MS) and 13C-nuclear magnetic resonance (13C-NMR).The results showed that,compared with the condensation products,the hydroxymethylation structures of M were dominant in the MF system.And,as a catalyst,the OH-ion was used to form the intermediates of melamine nitrogen negative ion or hydroxyl methyl oxygen negative ion which could participate in the reactions of hydroxylmethylation and condensation.Due to the isomery of the ESI-MS,it could not clearly showed the competitive relationships of the structures of bridge bonds (M-CH2-M) and ether bonds (MCH2OCH2M) in the MF system.In the study of 13C-NMR,it indicated that the F/M molar ratio has a considerable effect on the distribution of condensation products,which suggested that ethe bonds and bridge bonds have obvious competitive relationships under the condition of low F/M molar ratio,and ether bond graduallyhad the absolute advantage over bridge bonds with the increase of F/M molar ratio.In the MF system,the reason that the ether bonds were dominant may relate to the supramolecular phenomenon of π-π stacking.关键词
电喷雾电离质谱仪/核磁共振碳谱/三聚氰胺甲醛/竞争关系/超分子现象Key words
electrospray ionization mass spectrometer (ESI-MS)/13C-nuclear magnetic resonance (13C-NMR)/melamine-formaldehyde/competitive relationships/supramolecular phenomenon分类
化学化工引用本文复制引用
梁坚坤,李涛洪,曹明,席雪冬,吴志刚,杜官本..碱催化三聚氰胺甲醛体系中的竞争关系[J].森林与环境学报,2017,37(2):251-256,6.基金项目
国家科技支撑计划项目(2015BAD14B03) （2015BAD14B03）
国家自然科学基金地区项目(31360159). （31360159）
