波谱学杂志Issue(3)：372-380,9.
利用时域核磁共振研究脲醛树脂的固化过程
Curing Process of Urea-Formaldehyde Resin Studied by Time-Domain Nuclear Magnetic Resonance
摘要
Abstract
The curing process urea-formaldehyde resin without the use of hardeners was studied by time-domain nuclear magnetic resonance (TD NMR) at different temperatures. The results showed that urea-formaldehyde resin started curing at about 120℃and ended around 180℃. The total peak area for T2 decrease gradually with increasing temperature;and larger changes were observed when the temperature was above 140℃. At temperature range between 30 ℃ to 140 ℃, the peak areas decreased gradually and then increased slightly with increasing temperature at T1 (1)=0.014 ms;the peak areas decreased gradually with increasing temperature at T1 (2)= 327.455 ms. The total peak area for T1 decrease gradually with increasing temperature between 30℃and 180 ℃. The urea-formaldehyde resin system weight decreased gradually with increasing temperature in the solidification process, confirming that cross-linking condensation reaction may occur, giving off formaldehyde and water.关键词
时域核磁共振(TD NMR)/固化/自旋-自旋弛豫时间(T2)/自旋-晶格弛豫时间(T1)/脲醛树脂Key words
time-domain nuclear magnetic resonance/solidification/spin-spin relaxation time/spin-lattice relaxation time/urea-formaldehyde resin分类
数理科学引用本文复制引用
邵朱伟,张明辉,李新宇..利用时域核磁共振研究脲醛树脂的固化过程[J].波谱学杂志,2014,(3):372-380,9.基金项目
国家自然科学基金资助项目(30800866，31160141)． （30800866，31160141）
