文献类型：期刊文献

英文题名：Effect of Synthesis Conditions on the Structure and Curing Characteristics of High-Urea Content PUF Resin

作者：Fan, Dongbin[1] Chu, Fuxiang[1] Qin, Tefu[1] Li, Jianzhang[2]

第一作者：范东斌

通信作者：Fan, DB[1]|[a0005c9807e2805d84556]范东斌;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing, Peoples R China

年份：2011

卷号：87

期号：12

起止页码：1191-1203

外文期刊名：JOURNAL OF ADHESION

收录：;EI(收录号：20120314689154);Scopus(收录号：2-s2.0-84862973262);WOS:【SCI-EXPANDED(收录号:WOS:000297261600004)】；

基金：The authors are very grateful for financial support from the National Key Technology R&D Program of China (Project No. 2009BADB1B03) and the National High Technology Research and Development Program of China (863 Program) (Project No. 2010AA101703).

语种：英文

外文关键词：Curing characteristics; High urea content; Phenol-urea-formaldehyde resins; Structure; Synthesis conditions

摘要：Phenol-urea-formaldehyde (PUF) resins of high urea content were prepared at different hydroxyl/phenol (OH/P) mole ratios and formaldehyde/(phenol+urea) [F/(P+U)] mole ratios. The effect of synthesis parameters including OH/P and F/(P+U) mole ratios on the structure, composition, and curing characteristics of PUF resins were investigated by using both liquid (13)C nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). The NMR analysis indicated that an increase in the OH/P mole ratio and/or F/(P+U) mole ratio decreased the amount of unreacted urea and monosubstituted urea, and promoted the formation of polysubstituted urea. The DSC results showed that the higher OH/P mole ratio and/or F/(P+U) mole ratio of PUF resins resulted in a lower curing temperature. The F/(P+U) mole ratio of PUF resins seemed to have a more significant accelerating effect on the curing reaction than the OH/P mole ratio.