13C-NMR Study on the Structure of Phenol-Urea-Formaldehyde Resins Prepared by Methylolureas and Phenol

被引：40

作者：

Fan, Dongbin ^{[1
]}

Chang, Jianmin ^{[1
]}

Li, Jianzhang ^{[1
]}

Mao, An ^{[1
]}

Zhang, Lita ^{[1
]}

机构：

[1] Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2009年 / 112卷 / 04期

关键词：

phenol-urea-formaldehyde; resins; methylolureas; structure; C-13-NMR analysis; HARDENING ACCELERATION; COCONDENSED RESINS; FAST ADVANCEMENT; CURING BEHAVIOR; KINETICS; ADHESIVES; SPECTROSCOPY; PERFORMANCE; ESTERS;

D O I：

10.1002/app.29532

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Phenol-urea-formaldehyde (PUF) resins were synthesized by reacting mixture Of methylolureas (MMU), phenol, and formaldehyde. The structure of PUF cocondensed resins at different stages of reaction were analyzed by liquid C-13 nuclear magnetic resonance (NMR) spectroscopy. The liquid C-13-NMR analysis indicated that methylolureas had the dominant content in MMU with the reaction between urea and formaldehyde Under the alkaline condition. The PUF cocondensed resins had no free formaldehyde. methylolureas were well incorporated into the cocondensed resins by reacting with phenolic units to form cocondensed methylene bridges. The second formaldehyde influenced the further reaction and the structure of the PUF resins. The resins with the prepared method of PUFB possessed relatively high degree of polymerization and low proportion of unreacted methylol groups. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2195-2202, 2009

引用

页码：2195 / 2202

页数：8

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