State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, School of Light Industry and Engineering, South China University of Technology, Guangzhou, 516640, China.
State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, School of Light Industry and Engineering, South China University of Technology, Guangzhou, 516640, China.
Carbohydr Polym. 2019 Oct 15;222:114912. doi: 10.1016/j.carbpol.2019.05.042. Epub 2019 May 13.
Renewable and biodegradable packaging materials are desired for numerous applications. Pea starch (PS) and polylactic acid (PLA) are promising alternatives to petrochemical-based polymers except that their phase separation causes poor mechanical properties. To surmount this problem, PS/PLA films with a double-layer structure were designed. The bilayer films displayed better toughness, thermal stability and barrier capacity over those of PLA films. The incorporation of PLA on a PS layer increased water resistance and tensile strength over those of a monolayer PS film. Weak interfacial adhesion between the PS and PLA layers was revealed by Fourier transform infrared spectroscopy and scanning electron microscopy. The bilayer films reduced weight loss ratio of cherry tomatoes and extended the retention of organic acids and vitamin C. A bilayer architecture represents a promising route to develop packaging materials that display the advantageous properties of each material layer.
可再生且可生物降解的包装材料在许多应用中都受到青睐。豌豆淀粉（PS）和聚乳酸（PLA）是有前途的石油化工基聚合物替代品，但它们的相分离导致机械性能较差。为了解决这个问题，设计了具有双层结构的 PS/PLA 薄膜。与 PLA 薄膜相比，双层薄膜具有更好的韧性、热稳定性和阻隔性能。在 PS 层中加入 PLA 提高了水的阻力和拉伸强度单层 PS 薄膜。傅里叶变换红外光谱和扫描电子显微镜显示，PS 和 PLA 层之间的界面粘附力较弱。双层薄膜降低了樱桃番茄的失重率，并延长了有机酸和维生素 C 的保留时间。双层结构为开发具有各材料层优势性能的包装材料提供了一条有前途的途径。
