Liquefaction of corn stover and preparation of polyester from the liquefied polyol |
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Authors: | Fei Yu Yuhuan Liu Xuejun Pan Xiangyang Lin Chengmei Liu Paul Chen Roger Ruan |
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Institution: | (1) Center for Biorefining and Biosystems and Agricultural Engineering, University of Minnesota, 1390 Eckles Avenue, 55108 St. Paul, MN;(2) MOE Key Laboratory of Food Science, Nanchang University, 330047 Jiangxi, China;(3) Forest Products Biotechnology, University of British Columbia, 2424 Main Mall, V6T 1Z4 Vancouver, BC, Canada |
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Abstract: | This research investigated a novel process to prepare polyester from corn stover through liquefaction and crosslinking processes.
First, corn stover was liquefied in organic solvents (90 wt% ethylene glycol and 10 wt% ethylene carbonate) with catalysts
at moderate temperature under atmospheric pressure. The effect of liquefaction temperature, biomass content, and type of catalyst,
such H2SO4, HCl, H3PO4, and ZnCl2, was evaluated. Higher liquefaction yield was achieved in 2 wt% sulfuric acid, 1/4 (w/w) stover to liquefying reagent ratio;
160°C temperature, in 2h. The liquefied corn stover was rich in polyols, which can be directly used as feedstock for making
polymers without further separation or purification. Second, polyester was made from the liquefied corn stover by crosslinking
with multifunctional carboxylic acids and/or cyclic acid anhydrides. The tensile strength of polyester is about 5 MPa and
the elongation is around 35%. The polyester is stable in cold water and organic solvents and readily biodegradable as indicated
by 82% weight loss when buried in damp soil for 10 mo. The results indicate that this novel polyester could be used for the
biodegradable garden mulch film production. |
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Keywords: | Biodegradability liquefaction polyester strength solubility |
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