JOURNAL: The Canadian Journal of Chemical Engineering

ARTICLE TITLE : Characterization of polyurethane foams prepared from non-pretreated liquefied corn stover with PAPI


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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