PTGE交联增强改性大豆分离蛋白膜制备与性能研究

发布时间：2018-03-10 07:25

本文选题：大豆分离蛋白膜　切入点：复合改性　出处：《北京林业大学》2015年硕士论文　论文类型：学位论文

【摘要】：塑料包装材料可降解性差,是“白色污染”的主要来源。研发性能优良、可自然降解的新型膜材料是塑料包装领域的重要课题。大豆分离蛋白膜材料是一种“新型绿色生物质膜材料”,具有良好成膜性和可生物降解性,但存在着耐水性差和和机械性能低等缺点,限制了其在包装工业中的应用。本文以大豆分离蛋白为基材,丙三醇三缩水甘油醚(PTGE)、聚乙烯醇(PVA)、聚丙烯酰胺(PAM)等为改性剂,制备了改性大豆分离蛋白膜,以探究大豆蛋白膜的耐水性和机械性能。利用傅立叶变换红外光谱仪(FTIR)、X-射线衍射(XRD)、热重分析(TG)、扫描电子显微镜(SEM)等对膜性能和微观结构进行了分析。得出主要结论如下：(1)PVA的加入能够降低复合膜的氨基含量,提高其结晶度,并与大豆分离蛋白之间形成氢键,从而提高膜的热稳定性、力学性能和耐水性；添加PVA和PTGE后,通过PVA、SPI和PTGE之间发生的交联反应,复合膜的热稳定性和表面亲水性显著提高,膜的力学性能和耐水性也均有所提高。(2)PAM与大豆分离蛋白的相容性较好,并能形成氢键,从而使复合膜的热稳定性、力学性能和耐水性显著提高；PAM与PTGE的加入对复合膜的结构影响较大。复合膜的结晶峰变得尖且窄,并且PAM、SPI和PTGE之间能够发生化学交联反应,使复合膜的热稳定性、力学性能和耐水性均有所提高。
[Abstract]:The poor degradability of plastic packaging materials is the main source of "white pollution". Biodegradable membrane material is an important subject in the field of plastic packaging. Soybean protein isolate membrane material is a "new green biomass membrane material" with good film-forming and biodegradability. However, there are some disadvantages such as poor water resistance and low mechanical properties, which limit its application in packaging industry. In this paper, soybean protein isolate, triglycidyl triglycidyl triglyceride (PTGEN), polyvinyl alcohol (PVA), polyacrylamide (PAM) and so on are used as modifiers. The modified soybean protein isolate membrane was prepared. In order to explore the water resistance and mechanical properties of soybean protein films, the properties and microstructure of the films were analyzed by FTIR spectrometer, TGX, TGX, SEM and so on. The main results were as follows: (1) the main results are as follows: (1) the main results are as follows: (1) the main results are as follows: (1) the main conclusions are as follows: (1) the main conclusions are as follows: 1. The addition of PVA as follows can reduce the amino content of the composite membrane. By increasing the crystallinity and forming hydrogen bond with soybean protein isolate, the thermal stability, mechanical properties and water resistance of the membrane were improved. The thermal stability and surface hydrophilicity of the composite membrane were significantly improved, and the mechanical properties and water resistance of the composite membrane were also improved. The compatibility of PAM with soybean protein isolate was better, and the hydrogen bond could be formed, so that the thermal stability of the composite membrane could be improved. The addition of PAM and PTGE has a great influence on the structure of the composite membrane. The crystallization peak of the composite film becomes sharp and narrow, and the chemical crosslinking reaction can take place between PTGE and PAM, which makes the thermal stability of the composite membrane. Both mechanical properties and water resistance were improved.
【学位授予单位】：北京林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.893

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