PDF(Pubmed)
Abstract：
Starches plasticized with glycerol/citric acid/stearic acid and tributyl 2-acetylcitrate (ATBC), respectively, were processed with poly (butylene adipate-Co-terephthalate (PBAT) via extrusion and a film-blown process. All the composite films were determined for morphology, mechanical, thermal stability, crystalline, and optical properties. Results show that the most improved morphology was in the 30% glycerol plasticized PBAT/thermoplastic starch (TPS) composite films, characterized by the smallest and narrowest distribution of TPS particle sizes and a more uniform dispersion of TPS particles. However, the water absorption of PBAT/TPS composite films plasticized with glycerol surpassed that observed with ATBC as a plasticizer. Mechanical properties indicated insufficient plasticization of the starch crystal structure when using 10% ATBC, 20% ATBC, and 20% glycerol as plasticizers, leading to poor compatibility between PBAT and TPS. This resulted in stress concentration points under external forces, adversely affecting the mechanical properties of the composites. All PBAT/TPS composite films exhibited a negative impact on the initial thermal decomposition temperature compared to PBAT. Additionally, the haze value of PBAT/TPS composite films exceeded 96%, while pure PBAT had a haze value of 47.42%. Films plasticized with 10% ATBC, 20% ATBC, and 20% glycerol displayed lower transmittance values in the visible light region. The increased transmittance of films plasticized with 30% glycerol further demonstrated their superior plasticizing effect compared to other PBAT/TPS composite films. This study provides a simple and feasible method for preparing low-cost PBAT composites, and their extensions are expected to further replace general-purpose plastics in daily applications.
摘要：
用甘油/柠檬酸/硬脂酸和2-乙酰柠檬酸三丁酯（ATBC）增塑的淀粉，分别,通过挤出和薄膜吹塑工艺用聚（己二酸丁二醇酯-对苯二甲酸酯共聚物（PBAT）进行加工。所有的复合膜的形态测定，机械,热稳定性，结晶,和光学性质。结果表明,在30%甘油增塑的PBAT/热塑性淀粉(TPS)复合膜中,特征在于TPS颗粒尺寸的最小和最窄分布以及TPS颗粒的更均匀分散。然而,用甘油增塑的PBAT/TPS复合膜的吸水率超过了用ATBC作为增塑剂所观察到的吸水率。机械性能表明，当使用10％ATBC时，淀粉晶体结构的塑化不足，20%ATBC,和20%的甘油作为增塑剂，导致PBAT和TPS之间的兼容性差。这导致了外力作用下的应力集中点，不利地影响复合材料的机械性能。与PBAT相比,所有PBAT/TPS复合膜对初始热分解温度表现出负面影响。此外,PBAT/TPS复合薄膜的雾度值超过96%，而纯PBAT的雾度值为47.42%。用10%ATBC增塑的薄膜，20%ATBC,和20%甘油在可见光区域显示较低的透射率值。与其他PBAT/TPS复合膜相比，用30％甘油增塑的膜的透射率增加进一步证明了其优异的增塑效果。本研究为制备低成本PBAT复合材料提供了一种简单可行的方法,它们的延伸有望进一步取代日常应用中的通用塑料。
