Polyurethanes and polyesters from lignin
JOURNAL OF APPLIED POLYMER SCIENCE(2005)
摘要
Lignin, obtained through steam explosion from straw, was completely characterized via elemental analysis, gel permeation chromatography, ultraviolet and infrared spectroscopy, and C-13 and H-1 nuclear magnetic resonance spectrometry. Polyurethanes were obtained by treating steam-exploded lignin from straw with 4,4'-methylenebis(phenylisocyanate), 4,4'-methylenebis(phenylisocyanate) -ethandiol, and poly(1,4-butandiol)tolylene-2,4-di-isocyanate terminated. The obtained materials were characterized by using get permeation chromatography, infrared spectroscopy, and scanning electron microscopy. Differential scanning calorimetry analysis showed a T-g at -6 degrees C, assigned to the glass transition of the poly(1,4-butandiol) chains. The presence of ethylene glycol reduced the yields of the polyurethanes. The use of the prepolymer gave the best results in polyurethane formation. Steam-exploded lignin was used as the starting material in the synthesis of polyesters. Lignin was treated with doclecanoyl dichloride. The products were characterized by using gel permeation chromatography, infrared spectroscopy, C-13 and H-1 nuclear magnetic resonance spectrometry, and scanning electron microscopy. (c) 2005 Wiley Periodicals, Inc.
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关键词
biomaterials,polyesters,polyurethanes
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