Characterization of Urea-Formaldehyde Resins by GPC/SEC and HPLC Techniques: Effect of Ageing

被引：23
作者：
Ferra, Joao M. [1 ]
Mendes, Adelio M. [1 ]
Costa, Mario Rui N. [2 ]
Magalhaes, Fernao D. [1 ]
Carvalho, Luisa H. [1 ,3 ]
机构：
[1] Univ Porto, Fac Engn, LEPAE Dept Engn Quim, P-4200465 Oporto, Portugal
[2] Univ Porto, Fac Engn, LSRE Dept Engn Quim, P-4200465 Oporto, Portugal
[3] Inst Politecn Viseu, DEMad Dept Engn Madeiras, P-3504510 Viseu, Portugal
来源：
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY | 2010年 / 24卷 / 8-10期
关键词：
UF resins; characterization; polymerization reaction; ageing; GPC/SEC; HPLC; SIZE-EXCLUSION CHROMATOGRAPHY; MOLECULAR-WEIGHT DISTRIBUTION; POLYCONDENSATION RESINS; COLLOIDAL AGGREGATION; SPECTROSCOPY; SEPARATION; PARAMETERS; C-13-NMR; CURE; NIR;
D O I：
10.1163/016942410X501070
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
During the last 40 years, several analytical techniques have been developed/adapted to characterize urea-formaldehyde (UF) resins. However, a great part of the research about this kind of wood adhesives has been performed by industrial producers and, thus, the main part of the existing knowledge is retained within those companies. This work describes a methodology for determining the molecular weight distribution (MWD) of UF resins using Gel Permeation Chromatography (GPC)/Size Exclusion Chromatography (SEC) with 2 detectors (differential refractive index (RI) and differential viscosity). This method permitted to characterize/distinguish commercial UF resins produced with different F/U molar ratios and to monitor the molecular weight and MWD with ageing. An HPLC method was additionally used to evaluate the fraction of unreacted urea, monomethylolurea and dimethylolurea present in commercial UF resins and measure the evolution of these three compounds with ageing. (C) Koninklijke Brill NV, Leiden, 2010
引用
收藏
页码：1535 / 1551
页数：17
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