Fourier transform near-infrared (FT-NIR) spectroscopy has been described as a powerful technique for online monitoring and control of polymerisation reactions. In this work, the technique was used to monitor the viscosity of urea-formaldehyde resins during the condensation reaction. The main objective of this study was to develop a chemometric technique that can be used for online or offline determination of the resin's viscosity during synthesis. The best model uses the spectral region between 5000 and 4246 cm−1 and the first derivative with vector normalisation for preprocessing.
Büning-PfaueH. 2003. Analysis of water in food by near infrared spectroscopy.Food Chem.82(1): 107–115.
2.
CiurczakE. 1987. Uses of near-infrared spectroscopy in pharmaceutical analysis.Appl. Spectrosc. Rev. 23(1): 147–163.
3.
ConzenJP. 2006. Multivariate calibration. A pratical guide for developing methods in the quantitative analytical chemistry. Ettlinglen: Bruker Optik GmbH.
4.
DessipriE, MinopoluE, ChryssikosGD, GionisV, PaipetisA, PanayiotouC. 2003. Use of FT-NIR spectroscopy for on-line monitoring of formaldehyde-based resin synthesis.Eur. Polym. J. 39(8): 1533–1540.
5.
DunkyM. 1998. Urea-formaldehyde (UF) adhesive resins for wood.Int. J. Adhes. Adhes. 18(2): 95–107.
6.
EllisDI, GoodacreR. 2006: Metabolic fingerprinting in disease diagnosis: biomedical applications of infrared and Raman spectroscopy.Analyst131(8): 875–885.
7.
FerraJM, MenaPC, MartinsJ, MendesA, CostaMR, FernãoDM, CarvalhoLH. 2010. Optimization of the synthesis of urea-formaldehyde resins using response surface methodology.J. Adhes. Sci. Technol. 24(8–10): 1454–1471.
8.
KasprzykH, JózwiakM, ProszykS. 2001. Application of NIR spectroscopy for analysis of amino adhesive resins applied on wood based materials.Folia Forestalia Polonica32: 67–74.
9.
MachoS, LarrechiMS. 2002. Near-infrared spectroscopy and multivariate calibration for the quantitative determination of certain properties in the petrochemical industry.TrAC Trends Anal. Chem. 21(12): 799–806.
MinopoulouE, DessipriE, ChryssikosGD, GionisV, PaipetisA, PanayiotouC. 2003. Use of NIR for structural characterization of urea-formaldehyde resins.Int. J. Adhes. Adhes. 23(6): 473–484.
12.
ParadkarMM, IrudayarajJ. 2002. Determination of cholesterol in dairy products using infrared techniques: 1.FTIR spectroscopy. Int. J. Dairy Technol. 55(3): 127–132.
13.
PizarroC, Esteban-DíezI, NistalAJ, González-SáizJ.-M. 2004. Influence of data pre-processing on the quantitative determination of the ash content and lipids in roasted coffee by near infrared spectroscopy.Anal. Chim. Acta509(2): 217–227.
14.
SantosAF, SilvaFM, LenziMK, PintoJC. 2005. Monitoring and control of polymerization reactors using NIR spectroscopy.Polym. – Plast. Technol. Eng. 44(1): 1–16.
