Highly flexible glycol-urea-formaldehyde resins

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Ana Antunes (Author) Other; Nádia Paiva (Author) Other; João Ferra (Author) Other; Jorge Martins (Author) Other; Luísa Carvalho (Author) FEUP; Ana Barros Timmons (Author) Other; Fernão D. Magalhães (Author) FEUP

Journal

Title: European Polymer Journal

Vol. 105

Pages: 167-176

ISSN: 0014-3057

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 13 Citations

Scopus - 15 Citations

INSPEC

Associated Projects

2GAR - 2GAR - Resinas Amino de segunda Geração

LEPABE - Laboratório de Engenharia de Processos, Ambiente, Biotecnologia e Energia

Other information

Authenticus ID: P-00P-GKD

DOI: 10.1016/j.eurpolymj.2018.05.037

Abstract (EN): Urea-formaldehyde resins are successfully used in many contexts, but their tightly crosslinked thermoset structure impairs some applications, due to stiff and brittle behavior. In this work we show that copolymerization of urea and formaldehyde with glycols introduces linear flexible segments in the polymer structure, thus increasing the resilience and flexibility of the resin after curing. Glycols with different molecular weights (106, 200 and 400 g/mol) were incorporated in the synthesis in different amounts. The chemical and physical-mechanical properties of the resulting products were investigated in detail, namely using FTIR, C-13 RMN, GPC/SEC analysis, dynamic mechanical analysis, adhesive bond strength, and tensile-strain testing. Use of polyethyleneglycol with molecular weight 200 g/mol yielded the most promising glycol-urea-formaldehyde resin, with remarkable resilience and good adhesion properties. When used for paper impregnation, the modified resins yielded flexible and tough papers, in comparison with a conventional urea-formaldehyde resin, which produced brittle papers that fractured easily upon bending.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10