南京林业大学学报（自然科学版）2017，Vol.41Issue(3)：145-150,6.DOI:10.3969/j.issn.1000-2006.200607038
温度和固含量对脲醛树脂预固化行为的影响
Effects of temperature and solid content on the pre-curing behavior of urea-formaldehyde resin
摘要
Abstract
[Objective] Temperature and solid content significantly influence the molecular weight and chemical structure of pre-curing urea formaldehyde resins,playing an important role in regulating pre-curing behavior.[Method] Gel chromatography(GPC) and 13C-NMR were used to investigate the effects of temperature and solid content on the molecular weight distribution and main functional groups of pre-curing urea-formaldehyde resins,as well as the relative amounts of methylol,dimethylene and dimethylene ether groups.[Result] At constant pre-curing time,Mn and Mw increased with increasing curing temperature,with the content of dimethylene ethers initially increasing and then decreasing,whereas the content of terminal and linear methylol groups decreased and that of linear and network dimethylene groups increased.The molecular weight of higher-solid-content resins was higher than that of lower-solid-content ones,with insignificant differences observed between the former resins.Although the content of linear methylol,dimethylene and dimethylene ether groups slightly increased with increasing solid content,the total number of terminal methylol groups was unchanged.[Conclusion] Temperature had a much more significant effect on the pre-curing of urea-formaldehyde resins than their solid content,as determined by comparing the contents of methylol,dimethylene,and ether functional groups.关键词
预固化/脲醛树脂/温度/固体含量/分子质量分布/化学结构Key words
pre-curing/urea-formaldehyde resin/temperature/solid content/molecular weight distribution/chemical structure分类
化学化工引用本文复制引用
陈玉竹,李竞,刘芳,谢蕾,肖辉..温度和固含量对脲醛树脂预固化行为的影响[J].南京林业大学学报（自然科学版）,2017,41(3):145-150,6.基金项目
四川农业大学大学生创新创业训练计划(04054631) （04054631）
四川农业大学本科生科研兴趣培养计划(04054503) （04054503）
