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Thermal Degradation and Kinetics of Alginate Polyurethane Hybrid Material Prepared from Alginic Acid as a Polyol |
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| Authors: | Jin-San Kim Tara Sankar Pathak Jung-Ho Yun Ki-Pal Kim Tae-Joon Park Yongae Kim Ki-Jung Paeng |
| Institution: | 1. Department of Chemistry, Yonsei University, Wonju, 220-710, South Korea 4. Department of Chemistry, Surendra Institute of Engineering and Management, Siliguri, 734 009, West Bengal, India 2. Center for Environmental Technology Research, Korea Institute of Science and Technology, P.O. Box 131, Seoul, South Korea 3. Department of Chemistry and Protein Research Center for Bio-Industry, Hankuk University of Foreign Studies, Yongin, 449-791, South Korea |
| Abstract: | Alginate polyurethane hybrid materials are prepared by varying mole ratio of 2, 4-TDI as a di-isocyanate and alginic acid as a polyol in presence of dimethyl sulfoxide (DMSO) as a solvent. FT-IR and 13C one-dimensional (1D) solid state NMR (SSNMR) spectroscopy indicates that alginic acid is converted into alginate-polyurethane hybrid material via urethane linkage. Surface morphology of alginate-polyurethane hybrids changes by varying alginic acid: TDI ratio. The peak at near 221 °C in DSC thermogram of alginic acid (Alg) is shifted to higher temperature in alginate-polyurethane hybrid (Algpu1 and Algpu2). TGA study shows that alginate-polyurethane hybrid prepared using alginic acid: TDI = 1:1 (Algpu2) is more stable than alginic acid: TDI = 1:0.5 (Algpu1) at 300 °C. Kinetic analysis was performed to fit with TGA data, where the entire degradation process has been considered as three consecutive 1st order reactions. This study shows that thermal stability of alginate-polyurethane hybrid material was increased by adjusting mole ratio of 2, 4-TDI and alginic acid. |
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