Thermal properties of lignin-and molasses-based polyurethane foams

• Published in: Journal of thermal analysis and calorimetry 2008-05, Vol.92 (2), p.419-424
• Main Authors: Hatakeyama, H., Kosugi, R., Hatakeyama, T.
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Applied sciences; Chemistry; Chemistry and Materials Science; Exact sciences and technology; Inorganic Chemistry; Measurement Science and Instrumentation; Organic polymers; Physical Chemistry; Physicochemistry of polymers; Polymer Sciences; Properties and characterization; Thermal and thermodynamic properties
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-007-8963-1

Lignin-and molasses-based polyurethane (PU) foams with various lignin/molasses mixing ratios were prepared. The hydroxyl group in molasses and lignin is used as the reaction site and PU foams with various isocyanate (NCO)/the hydroxyl group (OH) ratios were obtained. Thermal properties of PU foams were investigated by differential scanning calorimetry (DSC), thermogravimetry (TG) and thermal conductivity measurement. Glass transition temperature ( T g ) was observed depending on NCO/OH ratio in a temperature range from ca. 80 to 120°C and thermal decomposition temperature ( T d ) from ca. 280 to 295°C. Mixing ratio of molasses and lignin polyol scarcely affected the T g and T d . Thermal conductivity of PU foams was in a range from 0.030 to 0.040 Wm −1 K −1 depending on mixing ratio of lignin and molasses.