Impact of the Synthesis Procedure on Urea-Formaldehyde Resins Prepared by Alkaline-Acid Process
authors Goncalves, C; Pereira, J; Paiva, N; Ferra, J; Martins, J; Magalhaes, F; Barros-Timmons, A; Carvalho, L
nationality International
journal INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
keywords ADHESIVES; CRYSTALLINITY; SPECTROSCOPY; PERFORMANCE; SEPARATION; STRENGTH; FTIR
abstract 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.
publisher AMER CHEMICAL SOC
issn 0888-5885
year published 2019
volume 58
issue 14
beginning page 5665
ending page 5676
digital object identifier (doi) 10.1021/acs.iecr.8b06043
web of science category Engineering, Chemical
subject category Engineering
unique article identifier WOS:000464769200032
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 3.573
5 year journal impact factor 3.684
category normalized journal impact factor percentile 69.58
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg