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Title: Monitoring of lignin-based polyurethane synthesis by FTIR-ATR
Authors: Cateto, C.A.
Barreiro, M.F.
Rodrigues, A.E.
Keywords: Lignin
Issue Date: 2008
Publisher: Elsevier
Citation: Cateto, C.A.; Barreiro, M.F.; Rodrigues, A.E. (2008) - Monitoring of lignin-based polyurethane synthesis by FTIR-ATR. Industrial Crops and Products. ISSN 0926-6690. 27:2 (2008) p.168-174
Abstract: FTIR-ATR (Fourier Transform Infrared Spectroscopy working in the mode of Attenuated Total Reflectance) was applied to study the formation of lignin-based polyurethanes. Although some studies related to the use of lignin in polyurethane synthesis, are available in literature, still persist a gap for a systematic study of this kind of systems, involving the measurement of kinetic data, modelling and optimization of the polymerization process. The present methodology allows the test of different formulations at a scale of 3–5 g, considering several process variables: temperature, NCO/OH ratio, type and average molecular weight of the polyol, type of isocyanate, type and weight content of lignin. This work aims to describe the methodology used to perform the FTIR experiments by presenting a case study. The polyurethane samples have been prepared starting with 4,4′-methylene-diphenylene isocyanate (MDI), policaprolactonediol (PCL) of three different average molecular weights (1000, 750 and 400) and a commercial lignin (Indulin AT from Meadwestvaco) at different weight contents (10, 15, 20 and 25%). The results obtained in this work point out for the validation of the proposed experimental technique and confirm that lignin was incorporated in the final three-component polyurethane sample by chemical reaction with isocyanates, i.e., formation of urethane linkages.
Peer review: yes
ISSN: 0926-6690
Publisher Version:
Appears in Collections:DTQB - Artigos em Revistas Indexados ao ISI/Scopus

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