Impact of the Synthesis Procedure on Urea-Formaldehyde Resins Prepared by Alkaline-Acid Process

被引：11

作者：

Goncalves, Carolina ^{[1
,2
]}

Pereira, Joao ^{[1
,3
]}

Paiva, Nadia ^{[2
]}

Ferra, Joao ^{[2
]}

Martins, Jorge ^{[1
,4
]}

Magalhaes, Fernao ^{[1
]}

Barros-Timmons, Ana ^{[5
,6
]}

Carvalho, Luisa ^{[1
,4
]}

机构：

[1] Univ Porto, LEPABE Fac Engn, Rua Dr Roberto Frias S-N, P-4200465 Porto, Portugal

[2] EuroResinas Ind Quim SA, P-7520195 Sines, Portugal

[3] ARCP, Rua Dr Julio de Matos 828-882, P-4200355 Porto, Portugal

[4] Inst Politecn Viseu, DEMad Wood Engn Dept, Campus Politecn Repeses, P-3504510 Viseu, Portugal

[5] Univ Aveiro, CICECO Aveiro Inst Mat, P-3810193 Aveiro, Portugal

[6] Univ Aveiro, Dept Quim, P-3810193 Aveiro, Portugal

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2019年 / 58卷 / 14期

关键词：

ADHESIVES; CRYSTALLINITY; SPECTROSCOPY; PERFORMANCE; SEPARATION; STRENGTH; FTIR;

D O I：

10.1021/acs.iecr.8b06043

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In this work, two synthesis procedures for the preparation of urea-formaldehyde (UF) resins, based on the alkaline-acid process, are studied in order to better understand the chemical reactions involved. For that purpose, the number of urea loads and the methyolation temperature were varied. The molecular weight distribution of the resins was monitored by gel permeation chromatography/size exclusion chromatography and the unreacted oligomers by high-performance liquid chromatography, during the synthesis processes. Chemical modifications were investigated using quantitative analysis by carbon-13 nuclear magnetic resonance of samples taken during the synthesis. The largest difference identified between the procedures regards the methylene linkages and methylol groups determined by C-13 NMR. With the results of this study, it is possible to optimize the process and the properties of particleboards produced.

引用

页码：5665 / 5676

页数：12

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