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Characterization of polyurethane foams prepared from non‐pretreated liquefied corn stover with PAPI
Author(s) -
Wang TiPeng,
Zheng ZongMing,
Mao ZhiHuai
Publication year - 2011
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20381
Subject(s) - thermogravimetric analysis , polyurethane , differential scanning calorimetry , isocyanate , materials science , polymerization , glass transition , thermal decomposition , corn stover , decomposition , fourier transform infrared spectroscopy , polymer chemistry , chemical engineering , chemistry , composite material , organic chemistry , polymer , hydrolysis , physics , engineering , thermodynamics
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 ( T g ) and the initial decomposition temperature increased from −36.12 and 52.18 to 1.20 and 73.30°C, respectively. And the range of T g expanded from 26.39 to 57.12°C.