Ortega-Toro Rodrigo, López-Córdoba Alex, Avalos-Belmontes Felipe
Department of Food Engineering, Faculty of Engineering, Food Packaging and Shelf Life Research Group (FP&SL) and Complex Fluids Engineering and Food Rheology (IFCRA) Research Group, Universidad de Cartagena, Carrera 6 # 36-100, Cartagena de Indias D.T y C, Colombia.
Duitama Sectional Faculty, School of Agricultural Business Administrations. Universidad Pedagógica y Tecnológica de Colombia. Carrera 18 con Calle 22, Duitama 150461, Colombia.
Heliyon. 2021 Feb 5;7(2):e06176. doi: 10.1016/j.heliyon.2021.e06176. eCollection 2021 Feb.
This work aims to improve the physicochemical properties of polylactic acid (PLA) and thermoplastic yam starch (TPS) blends using epoxidised sesame oil (ESO). We used epoxidised sesame oil from two Colombian Caribbean crops: and , with an oil substitution of 58.4 %. Films were obtained through extrusion and compression moulding processes. Moisture content, solubility, contact angle, and mechanical, barrier, and structural properties were determined using optical and scanning electron microscopy, infrared Fourier transform spectroscopy. Thermal analyses were also performed using thermogravimetry and differential scanning calorimetry techniques. The results suggest that the PLA and TPS interactions can be improved with the addition of ESO as coupling agent, enhancing the interfacial adhesion between the polymers, and favouring the smoothness of the film surface. Furthermore, the ESO addition led to increased thermal stability while restricting molecular mobility, indicating a coupling agent effect. In conclusion, the use of epoxidised oil for preparing films based on high PLA content and TPS allows obtaining enhanced interfacial adhesion. Considering the above, the developed materials have potential application in semi-rigid food packaging.
这项工作旨在使用环氧化芝麻油（ESO）改善聚乳酸（PLA）和热塑性山药淀粉（TPS）共混物的物理化学性质。我们使用了来自两种哥伦比亚加勒比作物的环氧化芝麻油： 和 ，油替代率为58.4%。通过挤出和压缩成型工艺获得薄膜。使用光学和扫描电子显微镜、红外傅里叶变换光谱法测定了水分含量、溶解度、接触角以及机械、阻隔和结构性能。还使用热重分析和差示扫描量热法进行了热分析。结果表明，添加ESO作为偶联剂可以改善PLA和TPS之间的相互作用，增强聚合物之间的界面粘附力，并有利于薄膜表面的光滑度。此外，添加ESO导致热稳定性增加，同时限制了分子流动性，表明存在偶联剂效应。总之，使用环氧化油制备基于高PLA含量和TPS的薄膜可以获得增强的界面粘附力。考虑到上述情况，所开发的材料在半刚性食品包装中具有潜在应用。
