PDF(Pubmed)
Abstract：
Biobased and biodegradable plastics have emerged as promising alternatives to conventional plastics offering the potential to reduce environmental impacts while promoting sustainability. This study focuses on the production of multilayer blown films with enhanced functional properties suitable for food packaging applications. Films were developed through co-extrusion in a three-layer film configuration, with Polybutylene Succinate (PBS) and Polybutylene Succinate Adipate (PBSA) as the external and internal layers, respectively. The functional layer consisted of Polyhydroxybutyrate (PHB) enhanced with nanoclays Cloisite® 30B at varying weight ratios. Films were also processed by manipulating the extruder screw speed of the functional layer to investigate its impact on the functional properties. Rheology, mechanical strength, and barrier performance were characterised to establish correlations between processing conditions and functional layer blends (Cloisite® 30B/PHB) on the properties of the resultant films. Rheological test results indicated that the system with 5% Cloisite® had the best polymer/nanofiller matrix dispersion. Mechanical and permeability tests showed that by varying the process conditions (the alteration of the thickness of the functionalized layer) resulted in an improvement in mechanical and barrier properties. Furthermore, the addition of the nanofiller resulted in a stiffening of the film with a subsequent decrease in permeability to oxygen and water vapour.
摘要：
生物基和生物降解塑料已成为传统塑料的有希望的替代品，具有减少对环境的影响，同时促进可持续性的潜力。这项研究的重点是生产具有增强功能特性的多层吹塑薄膜，适用于食品包装应用。薄膜通过共挤出在三层薄膜配置中显影，以聚丁二酸丁二醇酯（PBS）和聚丁二酸己二酸丁二醇酯（PBSA）作为外层和内层，分别。功能层由不同重量比的用纳米粘土Cloisite®30B增强的聚羟基丁酸酯(PHB)组成。还通过操纵功能层的挤出机螺杆速度来加工膜,以研究其对功能性质的影响。流变学,机械强度,表征和阻隔性能以建立加工条件和功能层共混物(Cloisite®30B/PHB)之间对所得膜的性能的相关性。流变学测试结果表明,具有5%Cloisite®的体系具有最佳的聚合物/纳米填料基质分散。机械和渗透性测试表明,通过改变工艺条件(改变官能化层的厚度)导致机械和阻隔性能的改善。此外，纳米填料的添加导致薄膜变硬，随后对氧气和水蒸气的渗透性降低。
