文献类型：期刊文献

英文题名：C-13 NMR study on the structure of ZnO-catalyzed phenol-urea-formaldehyde resin during its synthesis process

作者：Mo, Xianfeng[1,2] Fan, Dongbin[2] Qin, Tefu[2] Chu, Fuxiang[2]

第一作者：Mo, Xianfeng

通信作者：Chu, FX[1]|[a0005728d87cb2daf502d]储富祥;

机构：[1]Nanjing Forestry Univ, Journal Editorial Off, Nanjing 210037, Jiangsu, Peoples R China;[2]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2014

卷号：28

期号：22-23

起止页码：2316-2326

外文期刊名：JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000343668000006)】；

基金：This work was supported by the National Natural Science Foundation of China under [grant number 31200441]; National Key Technology R&D Program of China under [grant number 2012BAD24B04].

语种：英文

外文关键词：zinc oxide; synthesis process; C-13 NMR analysis; structure; phenol-urea-formaldehyde resin

摘要：The structure of ZnO-catalyzed phenol-urea-formaldehyde (PUF) resin at different synthesis stages was analyzed by liquid C-13 nuclear magnetic resonance spectroscopy. The results showed that the general structure of ZnO-catalyzed PUF resin was almost the same as the control PUF resin. Addition reaction between phenol and formaldehyde mainly occurred at the first stage. Total methylol groups amount between phenols of the control resin was a little lower than that of the ZnO-catalyzed PUF resin. Co-condensation and self-condensation reaction occurred at the second stage. The preparation method of ZnO-catalyzed PUF resin favored the co-condensation reaction between phenol methylol groups and urea units, while self-condensation reaction dominated the control resin at the second stage. Formaldehyde completely reacted for both the control and ZnO-catalyzed PUF final resin. The total amount of methylol and methylene groups between urea units and phenols, respectively, was almost the same for the two final resins. The total quantity of methylol groups between phenols represented a continuing downward trend from the first stage to the final stage, and the amount of methylol group (p-Ph-CH2OH) of ZnO-catalyzed PUF resin was 30% more than that of the control resin. Total co-condensed methylene groups amount of ZnO-catalyzed PUF resin was greater than that of the control resin, which indicated that ZnO could make the urea units well incorporated into the co-condensed PUF resin.