Determination of OH-number and functionality of polybutadiene-ol by FTIR and NMR spectroscopy

• Published in: Polymer testing Vol. 22; no. 2; pp. 165 - 168
• Main Authors: Sadeghi, G.Mir Mohammad, Morshedian, J, Barikani, M
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-04-2003; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Functionality; H-NMR; IR absorption; OH-number; Organic polymers; Physicochemistry of polymers; Polybutadiene-ol; Properties and characterization; Structure, morphology and analysis; OH-number; Polybutadiene-ol; IR absorption; H-NMR; Functionality; Infrared spectrometry; Fourier transformation; Fonctionality; Hydroxyl group; Prepolymer; NMR spectrometry; Measurement method; Experimental study; Butadiene(hydroxy) polymer
• ISSN: 0142-9418; 1873-2348
• DOI: 10.1016/S0142-9418(02)00065-X

In this work, location and number of OH functional groups in polybutadiene-ol, a pre-polymer used for producing special purpose polyurethanes and unsaturated polyesters, was determined by a combination of two analytical methods: FTIR and H-NMR spectroscopy. Hydroxyl concentration or OH equivalent weight of the pre-polymer was measured through a comparison between the IR absorption band of THF-associated hydroxyl groups around 3450 cm
−1 with the calibration curve, which was obtained using OH/THF-associated absorption plotted against concentration of various primary alcohols. The 500 MHz H-NMR spectrum of butadiene-ol was then obtained to determine molecular weight and concentration of hydroxyl groups.