Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 292, Issue 4, Pages 484-494Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.200600401
Keywords
biodegradable; compatibility; composite material; soy-protein dreg; water-resistivity
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A series of biodegradable, soy-protein-based, composite materials was prepared by introducing castor-oil-based polyurethane prepolymer (PUP) into soy dreg (SD) without the addition of plasticizers, via extrusion and a compression-molding process. The effects of the NCO/OH molar ratio and the PUP content on the structure and properties of the resulting materials were studied by Fourier-transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, dynamic mechanical thermal analysis, tensile testing, swelling experiments, and biodegradability testing. The results revealed that the -NCO group in the PUP played a vital role in improving the compatibility and elasticity, as a result of the formation of a cross-linking network structure with the -NH2, -NH, and -OH groups in SD containing protein and cellulose. Increasing the NCO/OH molar ratio to 2.0 resulted in an enhancement of the degree of cross-linking, leading to a higher tensile strength (24 MPa), glass-transition temperature (52 degrees C) and water-resistivity of the composite materials. The unreacted SD s also served as a filler in the cross-linked networks and enhanced the tensile strength of the composites. The biodegradation testing showed that the composites exhibited biodegradability under the condition of fungus culture.
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