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A New Network Composite Material Based on Soy Dreg Modified with Polyurethane Prepolymer
Author(s) -
Chen Yun,
Zhang Lina,
Deng Rui,
Cui Yejian
Publication year - 2007
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600401
Subject(s) - materials science , prepolymer , differential scanning calorimetry , polyurethane , ultimate tensile strength , composite number , composite material , swelling , plasticizer , soy protein , biodegradation , glass transition , scanning electron microscope , extrusion , fourier transform infrared spectroscopy , compression molding , chemical engineering , polymer , organic chemistry , chemistry , mold , biochemistry , physics , engineering , thermodynamics
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 NH 2 , 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 °C) and water‐resistivity of the composite materials. The unreacted SD 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.