Determination of formaldehyde/urea molar ratio in amino resins by near-infrared spectroscopy

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Ana Henriques (Author) FEUP; Paulo Cruz (Author) Other; Jorge Martins (Author) FEUP; João M. Ferra (Author) FEUP; Fernão D. Magalhães (Author) FEUP; Luísa H. Carvalho (Author) FEUP

Journal

Title: Journal of Applied Polymer Science

Vol. 124 No. 3

Pages: 2441-2448

ISSN: 0021-8995

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 21 Citations

ISI Web of Science

Scopus - 22 Citations

INSPEC

COMPENDEX

Scientific classification

CORDIS: Technological sciences > Technology > Chemical technology > Polymer technology

FOS: Natural sciences > Chemical sciences

Associated Projects

EO_Formaldehyde - Concepção de sistemas adesivos taylor-made para o fabrico de painéis de madeira de baixa emissão de formaldeído

Other information

Authenticus ID: P-002-A50

DOI: 10.1002/app.35128

Abstract (EN): New processes for synthesis of urea-formaldehyde (UF) and melamine-fortified urea-formaldehyde (mUF) resins have been developed in the last years, motivated by the current concerns about the effects of formaldehyde on human health. All these formulations are quite susceptible to possible operation error, which can significantly influence the characteristics of the final product. The main objective of this work was to implement chemometric techniques for off-line monitoring of the product's formaldehyde/urea (F/U) molar ratio using near infrared (NIR) spectroscopy. This allows the timely implementation of the necessary corrections in case the product is off-specification. Calibration models for F/U molar ratio were developed taking into account the most relevant spectral regions for these resins, individually or in combination (7502-6098 cm(-1) and 5000-4246 cm(-1)) and using different preprocessing methods. When the appropriate spectral range and preprocessing methods are selected, it is possible to obtain calibration models with high correlation values for these resins. The best preprocessing methods were identified for three cases: UF resin (produced by strongly-acid process), mUF resin (alkaline-acid process), and a combined model that involves both UF and mUF resins. It was concluded that significantly better accuracy is obtained when a new model is developed for each particular resin system. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8