Sabalina Alisa, Gaidukovs Sergejs, Aunins Arturs, Gromova Anda, Gaidukova Gerda, Orlova Liga, Platnieks Oskars
Institute of Chemistry and Chemical Technology, Faculty of Natural Sciences and Technology, Riga Technical University, P. Valdena 3, LV-1048 Riga, Latvia.
Institute of Materials and Surface Engineering, Faculty of Natural Sciences and Technology, Riga Technical University, P. Valdena 3, LV-1048 Riga, Latvia.
Polymers (Basel). 2024 Aug 13;16(16):2288. doi: 10.3390/polym16162288.
Biodegradable and bio-based polymers, including polyhydroxyalkanoate (PHA), polylactic acid (PLA), and poly(butylene succinate--adipate) (PBSA), stand out as sustainable alternatives to traditional petroleum-based plastics for a wide range of consumer applications. Studying binary and ternary blends is essential to exploring the synergistic combinations and efficiencies of three distinct biopolyesters. A comprehensive evaluation of melt-extruded binary and ternary polymer blends of PHA, PLA, and PBSA was conducted. Scanning electron microscopy (SEM) analyses revealed a heterogeneous morphology characteristic of immiscible blends, with a predominant spherical inclusion morphology observed in the majority of the blends. An increased PBSA concentration led to an elevation in melt viscosity and elasticity across both ternary and binary blends. An increased PHA content reduced the viscosity, along with both storage and loss moduli in the blends. Moreover, a rise in PHA concentration within the blends led to increased crystallinity, albeit with a noticeable reduction in the crystallization temperature of PHA. PLA retained amorphous structure in the blends. The resultant bio-based blends manifested enhanced rheological and calorimetric traits, divergent from their pure polymer counterparts, highlighting the potential for optimizing material properties through strategic formulation adjustments.
可生物降解和生物基聚合物，包括聚羟基脂肪酸酯（PHA）、聚乳酸（PLA）和聚（丁二酸丁二醇酯-己二酸酯）（PBSA），作为传统石油基塑料的可持续替代品，在广泛的消费应用中脱颖而出。研究二元和三元共混物对于探索三种不同生物聚酯的协同组合和效率至关重要。对PHA、PLA和PBSA的熔融挤出二元和三元聚合物共混物进行了全面评估。扫描电子显微镜（SEM）分析揭示了不相容共混物的非均相形态，在大多数共混物中观察到主要为球形夹杂物形态。PBSA浓度的增加导致三元和二元共混物的熔体粘度和弹性升高。PHA含量的增加降低了共混物的粘度以及储能模量和损耗模量。此外，共混物中PHA浓度的增加导致结晶度增加，尽管PHA的结晶温度显著降低。PLA在共混物中保持无定形结构。所得生物基共混物表现出增强的流变学和量热学特性，与其纯聚合物对应物不同，突出了通过战略配方调整优化材料性能的潜力。
