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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Carolina Gonçalves (Autor) Outra; João Pereira (Autor) Outra; Nádia Paiva (Autor) Outra; João Ferra (Autor) Outra; Jorge Martins (Autor) FEUP; Fernão D. Magalhães (Autor) FEUP; Ana Barros Timmons (Autor) Outra; Luísa Carvalho (Autor) FEUP

Revista

Título: Industrial and Engineering Chemistry Research

Vol. 58 Nº 14

Páginas: 5665-5676

ISSN: 0888-5885

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 4 Citações

Projetos Associados

LEPABE - Projeto Estratégico do LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

2GAR - 2GAR - Resinas Amino de segunda Geração

Outras Informações

ID Authenticus: P-00Q-F84

DOI: 10.1021/acs.iecr.8b06043

Abstract (EN): 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12