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Production of bio-polyurethane (BPU)foams from greenhouse/agricultural wastes, and their biodegradability

Material type: TextSeries: ; Biofuels, Bioproducts and Biorefining, 16(3), p.826-837, 2022Contained works:
  • Li, H
  • Kognou, A. L. M
  • Jiang, Z. H
  • Qin, W
  • Xu, C. C
Subject(s): Online resources: Abstract: The exploration of effective utilization of greenhouse wastes is challenging. This paper demonstrates a hydrothermal treatment approach involving the co-liquefaction of greenhouse wastes with agricultural residue in a mixed solvent of water and ethanol in the presence of a base catalyst, to convert greenhouse wastes and corn stalk into bio-oil/bio-polyol at a very high yield of 57.2 percent, accompanied by a very low yield of solid residue. This bio-oil (hydroxyl number: 305?mg KOH/g)was successfully used as bio-polyol to substitute up to 50 percent petroleum-based polyol for the preparation of bio-polyurethane (BPU)foams. The biodegradability of the BPU foams was also studied by incubation with Dyella sp. for a period of 8?weeks. The weight loss, Fourier-transform infrared (FTIR)spectra, thermogravimetric analysis (TGA)results, and scanning electron microscopy (SEM)images of foam samples were collected and analyzed. The BPU foams exhibited much better biodegradability than the petroleum-based polyurethane (PU)foam.
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The exploration of effective utilization of greenhouse wastes is challenging. This paper demonstrates a hydrothermal treatment approach involving the co-liquefaction of greenhouse wastes with agricultural residue in a mixed solvent of water and ethanol in the presence of a base catalyst, to convert greenhouse wastes and corn stalk into bio-oil/bio-polyol at a very high yield of 57.2 percent, accompanied by a very low yield of solid residue. This bio-oil (hydroxyl number: 305?mg KOH/g)was successfully used as bio-polyol to substitute up to 50 percent petroleum-based polyol for the preparation of bio-polyurethane (BPU)foams. The biodegradability of the BPU foams was also studied by incubation with Dyella sp. for a period of 8?weeks. The weight loss, Fourier-transform infrared (FTIR)spectra, thermogravimetric analysis (TGA)results, and scanning electron microscopy (SEM)images of foam samples were collected and analyzed. The BPU foams exhibited much better biodegradability than the petroleum-based polyurethane (PU)foam.

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