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采用微波辐射和马来酸酐(MA)接枝技术对大豆分离蛋白(SPI)进行了复合改性,产物经甘油和水增塑后,通过热压成型得到一种SPI可生物降解材料。研究了微波功率、微波处理时间和MA添加量对该改性材料的力学性能、耐水性能和光学性能的影响,并利用扫描电镜(SEM)观察了材料的微观结构。结果表明:该复合改性SPI可生物降解材料,呈现较好的微观网状结构,并具有良好的综合性能。其拉伸强度为11.48 MPa,断裂伸长率为240.3%,吸水率为33.4%,透光率为39.5%。
The soybean protein isolate (SPI) was modified by microwave radiation and maleic anhydride (MA) grafting. The product was plasticized with glycerin and water and then was thermoformed to obtain an SPI biodegradable material. The effects of microwave power, microwave treatment time and MA content on the mechanical properties, water resistance and optical properties of the modified materials were studied. The microstructure of the materials was observed by scanning electron microscopy (SEM). The results show that the composite modified SPI biodegradable material has a good microscopic network structure and has good comprehensive properties. The tensile strength is 11.48 MPa, the elongation at break is 240.3%, the water absorption is 33.4% and the light transmittance is 39.5%.