A novel biodegradable protein-based material (UMSPIE) that consists of natural polymer soy protein isolate (SPI), ultrasonic-modified montmorillonite (UMMT), and ethylene glycol diglycidyl ether (EGDE) was produced by solution casting. Fourier infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TG), and scanning electron microscopy (SEM) were used to characterize the chemical structure and micro-morphologies of as-synthesized protein-based composite films. The results showed that the interlayer structure of MMT was destroyed by ultrasonic treatment, and the hydrogen bonding between SPI chains and the ultrasound-treated MMT plates was enhanced. The synergistic effect of UMMT and EGDE on SPI molecules made the network structure of the UMSPIE film denser. In addition, the mechanical and barrier properties of the as-synthesized films were explored. Compared with pure soy protein film, the tensile strength of the UMSPIE film has an increase of 266.82% (increasing from 4.4 to 16.14 MPa). From the above, the modified strategy of layered silicates filling combining crosslinking agents is considered as an effective method to improve the functional properties of bio-based polymer composites.

中文翻译：

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超声波改性蒙脱石结合乙二醇二缩水甘油醚增强蛋白质基复合膜

一种新型的可生物降解蛋白质基材料 (UMSPIE) 由天然聚合物大豆分离蛋白 (SPI)、超声改性蒙脱石 (UMMT) 和乙二醇二缩水甘油醚 (EGDE) 组成。傅里叶红外光谱 (FTIR)、X 射线衍射 (XRD)、热重分析 (TG) 和扫描电子显微镜 (SEM) 用于表征合成的蛋白质基复合膜的化学结构和微观形貌。结果表明，超声处理破坏了MMT的层间结构，增强了SPI链与超声处理的MMT板之间的氢键。UMMT和EGDE对SPI分子的协同作用使UMSPIE薄膜的网络结构更加致密。此外，研究了合成薄膜的机械和阻隔性能。与纯大豆蛋白薄膜相比，UMSPIE薄膜的拉伸强度提高了266.82%（从4.4增加到16.14 MPa）。综上所述，层状硅酸盐填充结合交联剂的改进策略被认为是提高生物基聚合物复合材料功能性能的有效方法。