Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/103474
Author(s): Nádia Paiva
J. Pereira
João Ferra
P. Cruz
Luísa Carvalho
F. D. Magalhães
Title: Study of influence of synthesis conditions on properties of melamine-urea formaldehyde resins
Issue Date: 2012
Abstract: The aim of this work is to assess the differences in the polymeric structure and performance of melamine-urea formaldehyde (MUF) resins, when changing relevant synthesis variables: formaldehyde/amine groups [F/(NH 2) 2] molar ratio (both in the methylolation and the condensation steps) and the feedrate of urea during the condensation step. This synthesis process differs from the traditional alkaline acid process, since the F/(NH 2) 2 molar ratio is different for the methylolation and condensation steps. It was found that the F/(NH 2) 2 molar ratio and urea feedrate in the condensation step are the most influential variables on the product characteristics. A relationship was established between polymeric structure of the resin and the physicomechanical properties, as well as the levels of formaldehyde. A resin formulation was obtained that exhibits a formaldehyde content, evaluated both by perforator and desiccator methods, within the Japanese F**** requirements. This resin presents an overall performance better than the one obtained by two representative commercial resins. © 2012 IWSc.
URI: https://repositorio-aberto.up.pt/handle/10216/103474
Related Information: info:eu-repo/grantAgreement/Agência de Inovação, S.A./Projectos de I&DT em Co-Promoção/SI IDT - 5347/2008/Concepção de sistemas adesivos taylor-made para o fabrico de painéis de madeira de baixa emissão de formaldeído/EO_Formaldehyde
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

Files in This Item:
File Description SizeFormat 
68824.pdf
  Restricted Access
Artigo original publicado497.36 kBAdobe PDF    Request a copy from the Author(s)


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.