Li Kuang, Jin Shicun, Chen Hui, He Jing, Li Jianzhang
Key Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, China.
Ministry of Education, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China.
Polymers (Basel). 2017 May 6;9(5):167. doi: 10.3390/polym9050167.
Soy protein isolate (SPI)-based materials are abundant, biocompatible, renewable, and biodegradable. In order to improve the tensile strength (TS) of SPI films, we prepared a novel composite film modified with microcrystalline cellulose (MCC) and metal nanoclusters (NCs) in this study. The effects of the modification of MCC on the properties of SPI-Cu NCs and SPI-Zn NCs films were investigated. Attenuated total reflectance-Fourier transformed infrared spectroscopy analyses and X-ray diffraction patterns characterized the strong interactions and reduction of the crystalline structure of the composite films. Scanning electron microscopy (SEM) showed the enhanced cross-linked and entangled structure of modified films. Compared with an untreated SPI film, the tensile strength of the SPI-MCC-Cu and SPI-MCC-Zn films increased from 2.91 to 13.95 and 6.52 MPa, respectively. Moreover, the results also indicated their favorable water resistance with a higher water contact angle. Meanwhile, the composite films exhibited increased initial degradation temperatures, demonstrating their higher thermostability. The results suggested that MCC could effectively improve the performance of SPI-NCs films, which would provide a novel preparation method for environmentally friendly SPI-based films in the applications of packaging materials.
大豆分离蛋白（SPI）基材料丰富、具有生物相容性、可再生且可生物降解。为了提高SPI薄膜的拉伸强度（TS），本研究制备了一种用微晶纤维素（MCC）和金属纳米团簇（NCs）改性的新型复合薄膜。研究了MCC改性对SPI-Cu NCs和SPI-Zn NCs薄膜性能的影响。衰减全反射傅里叶变换红外光谱分析和X射线衍射图谱表征了复合薄膜的强相互作用和晶体结构的减少。扫描电子显微镜（SEM）显示改性薄膜的交联和缠结结构增强。与未处理的SPI薄膜相比，SPI-MCC-Cu和SPI-MCC-Zn薄膜的拉伸强度分别从2.91 MPa提高到13.95 MPa和6.52 MPa。此外，结果还表明它们具有良好的耐水性，水接触角更高。同时，复合薄膜的初始降解温度升高，表明其热稳定性更高。结果表明，MCC可以有效提高SPI-NCs薄膜的性能，这将为包装材料应用中基于SPI的环保薄膜提供一种新的制备方法。
