This study focuses on producing 3-layer films out of Low-Density Polyethylene (LDPE) and Thermoplastic Starch (TPS) using the latter to improve the film oxygen barrier properties. Potato and corn-based TPS, plasticized with glycerol, have been prepared and blended with LDPE using a twin-screw extruder. The TPS fraction was varied from 50 to 80 wt%. The effect of a maleated copolymer as blend compatibilizer was assessed by examining blend morphology using scanning electron microscopy. The aforementioned TPS/LDPE blend was used as a core layer in a 3-layer blown film with pure LDPE as outer layers. Natural and organo-modified clays were added to the TPS phase at concentrations up to 5 wt% to investigate their effect on blend morphology as well as on processability and physical properties of the film. X-ray diffraction experiments indicated significant exfoliation and a general orientation of non-exfoliated clay parallel to the film surface. Adding natural clay to the TPS was also found to improve processing and quality of the films. Highly transparent films with oxygen barrier 20 times higher than pure LDPE films were achieved while maintaining similar mechanical properties relative to pure LDPE. The multilayer TPS/LDPE film could therefore represent a low-cost bio-based alternative for food packaging requiring better oxygen protection in order to increase shelf-life.

这项研究的重点是用低密度聚乙烯（LDPE）和热塑性淀粉（TPS）生产三层薄膜，并使用后者来改善薄膜的氧气阻隔性能。已经制备了用甘油增塑的马铃薯和玉米基TPS，并使用双螺杆挤出机将其与LDPE混合。TPS分数在50至80重量％之间变化。通过使用扫描电子显微镜检查共混物形态来评估马来化共聚物作为共混物增容剂的作用。上述TPS / LDPE共混物被用作三层吹膜中的芯层，其中纯LDPE作为外层。将天然和有机改性的粘土以不超过5 wt％的浓度添加到TPS相中，以研究其对共混物形态以及膜的可加工性和物理性能的影响。X射线衍射实验表明显着的剥落和未剥落的粘土的平行于薄膜表面的一般取向。还发现向TPS中添加天然粘土可改善薄膜的加工性能和质量。获得了具有比纯LDPE薄膜高20倍的氧气阻隔性的高度透明的薄膜，同时保持了与纯LDPE相似的机械性能。因此，多层TPS / LDPE膜可以代表食品包装的低成本生物基替代品，需要更好的氧气保护以延长保质期。获得了具有比纯LDPE膜高20倍的氧气阻隔性的高度透明的膜，同时保持了与纯LDPE相似的机械性能。因此，多层TPS / LDPE膜可以代表食品包装的低成本生物基替代品，需要更好的氧气保护以延长保质期。获得了具有比纯LDPE薄膜高20倍的氧气阻隔性的高度透明的薄膜，同时保持了与纯LDPE相似的机械性能。因此，多层TPS / LDPE膜可以代表食品包装的低成本生物基替代品，需要更好的氧气保护以延长保质期。