Título: Journal of Applied Polymer ScienceImportada do Authenticus Pesquisar Publicações da Revista

Vol. 124 Nº 3

Páginas: 2311-2317

ISSN: 0021-8995

Editora: Wiley-Blackwell

ISI Web of Knowledge - 44 Citações

ISI Web of Science

Scopus - 56 Citações

COMPENDEX

FOS: Ciências exactas e naturais > Química

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia de materiais

ID Authenticus: P-002-A4Z

DOI: 10.1002/app.35282

Abstract (EN): Melamine can be incorporated in the synthesis of urea-formaldehyde (UF) resins to improve performance in particleboards (PB), mostly in terms of hydrolysis resistance and formaldehyde emission. In this work, melamine-fortified UF resins were synthesized using a strong acid process. The best step for melamine addition and the effect of the reaction pH on the resin characteristics and performance were evaluated. Results showed that melamine incorporation is more effective when added on the initial acidic stage. The condensation reaction pH has a significant effect on the synthesis process. A pH below 3.0 results on a very fast reaction that is difficult to control. On the other hand, with pH values above 5.0, the condensation reaction becomes excessively slow. PBs panels produced with resins synthesized with a condensation pH between 4.5 and 4.7 showed good overall performance, both in terms of internal bond strength and formaldehyde emissions. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7