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Study of Preparation and Application on Biodegradable Materials of Modified Soy Protein

Author: WangHongJie
Tutor: ChenFuSheng
School: Henan University of Technology
Course: Cereals, Oils and Vegetable Protein Engineering
Keywords: Soy Protein Isolate Biodegradable Materials Modification Application
CLC: TB39
Type: Master's thesis
Year: 2013
Downloads: 43
Quote: 0
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Abstract


In this paper, soybean protein isolate (SPI) was modified by microwave radiation andmaleic anhydride (MA) graft technology, then plasticized by glycerol and water, and a kind ofSPI biodegradable material was obtained through hot pressing molding. The SPIbiodegradable material with a lower water absorption, higher strength, and a certainflexibility was successfully prepared. Some supplies such as disposable knife, fork,chopsticks and comb were successfully prepared by using these materials. The structuralproperties analysis and degradation tests of materials were done to provide a theoretical basisfor further research in this field.In this paper, the effects of hot-pressing process and modified conditions on theproperties of SPI biodegradable material were studied. The best hot-pressing conditions ofpreparing the SPI biodegradable material were as follows: pressing temperature of120℃, hotpressure of15MPa, pressing time of15min. Using five-factor orthogonal rotation experiment,the modified conditions of SPI biodegradable material were optimized. The optimumconditions were as follows: the addition of maleic anhydride of15%, microwave power480W, microwave time3min, the addition amount of glycerol of20%, the addition amount ofwater of15%. Under these conditions, the properties of the obtained SPI biodegradablematerial were as follows: tensile strength of11.48MPa, elongation of240.3%, waterabsorption of33.4%，light transmittance of39.5%.The results of SDS-PAGE test showed that: the content of high molecular weight subunitwere increased in SPI biodegradable material compared with raw SPI materials, there was thecross-linking reactions to be occurred among SPI molecules, and covalent bonds to be formed.In thermodynamic performance test, the results showed that: SPI material moldingtemperature should be between100-180℃, small molecule plasticized and modification canimprove the thermal stability of the material. The results of FTIR test revealed that: in thehot-pressing process, some cross-linking reactions took place between MA and SPI molecules,microwave promoted the reactions. The results of SEM test displayed that: the compositemodified SPI material was plasticized well, dense in internal structure, and relativelyhomogeneous structure on the crisp cross section, relatively flat and less cracks on materialsurface. The results of XRD test demonstrated that: crystallinity of SPI was improved byhot-pressing or modification, but the effect of modification was more obvious. The degradation results showed: after42days in the aqueous soil solution environment,the rate of weight loss of the SPI biodegradable material was62.2%weight; after49days inthe natural soil environment, the rate of weight loss was68.7%. It showed that thebiodegradability was in conforming with the national standard.(GB/T18006.1-2009)Technical and health physics and chemistry index parameters of the disposable tableware hadbeen tested and were in line with national requirements.

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