Improvement of rheological and functional properties of defatted rice bran protein bioplastic by kraft lignin addition
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Author list: Rattanatham P., Kunanopparat T., Siriwattanayotin S.
Publication year: 2011
Journal: Thai Journal of Agricultural Science (0049-3589)
Volume number: 44
Issue number: 5
Start page: 56
End page: 61
Number of pages: 6
ISSN: 0049-3589
Languages: English-Great Britain (EN-GB)
Abstract
The aim of this research was to study the effect of Kraft lignin (KL) on rheological and functional properties of defatted rice bran protein (DRBP) blend. DRBP was extracted from defatted rice bran by alkaline extraction. DRBP plasticized with 30% glycerol was blended with 0-70% KL and then hot-molded using compression molding. Viscosity, storage modulus, mechanical properties and water absorption of plasticized KL/DRBP blend were respectively determined by capillary rheometer, dynamic mechanical thermal analysis, texture analyzer and water immersion method. Concerning the rheological properties, KL addition resulted in a decrease in viscosity and storage modulus in rubbery state of DRBP blends at processing temperature. In addition, an introduction of KL in DRBP blend improved functional properties of materials in terms of mechanical properties and water absorption. The KL/DRBP bioplastics exhibited higher Young's modulus and tensile strength and lower water absorption compared to DRBP-based materials. Therefore, the addition of KL can be considered as a good way to improve processability due to a decrease in viscosity and also improve properties of DRBP-based bioplastic.
Keywords
Defatted rice bran protein
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