Characterization of polyurethane foams prepared from non‐pretreated liquefied corn stover with PAPI |
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| Authors: | Ti‐Peng Wang Zong‐Ming Zheng Zhi‐Huai Mao |
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| Affiliation: | 1. National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, 2 Beinong Lu, Beijing 102206, China;2. College of Engineering, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, China |
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| Abstract: | Polyurethane foams were prepared through co‐polymerization of non‐pretreated liquefied corn stover (LCS) and polymethylene polyphenylisocyanate (PAPI). The effects of NCO]/OH] ratio on the chemical structure and the thermal properties were studied by means of Fourier transform infrared spectroscopy (FT‐IR), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The urethane linkages and the free isocyanate groups in co‐polymerization were detected from FT‐IR analysis. Thermal decomposition of polyurethane foams occurred in four main successive stages. With the increasing NCO]/OH] ratio, the glass transition temperature (Tg) and the initial decomposition temperature increased from ?36.12 and 52.18 to 1.20 and 73.30°C, respectively. And the range of Tg expanded from 26.39 to 57.12°C. |
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| Keywords: | liquefaction polyurethanes thermal properties corn stover FT‐IR |
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