Merijs-Meri Remo, Zicans Janis, Ivanova Tatjana, Mezule Linda, Ivanickins Aleksandrs, Bockovs Ivan, Bitenieks Juris, Berzina Rita, Lebedeva Alina
Institute of Chemistry and Chemical Technology, Faculty of Natural Sciences and Technology, Riga Technical University, 1048 Riga, Latvia.
Water Systems and Biotechnology Institute, Faculty of Natural Sciences and Technology, Riga Technical University, 1048 Riga, Latvia.
Polymers (Basel). 2024 Oct 3;16(19):2808. doi: 10.3390/polym16192808.
The current research is devoted to the development and characterization of green antimicrobial polymer biocomposites for food packaging applications. The biocomposites were developed by melt compounding on the basis of two different succinate polymer matrices with varying chain stiffness-polybutylene succinate (PBS) or its copolymer with 20 mol.% of polybutylene adipate (PBSA). Fungi chitosan oligosaccharide (C98) and crustacean chitosan (C95) were used as antimicrobial additives. The rheological properties of the developed biocomposites were determined to clear out the most suitable temperature for melt processing. In addition, mechanical, thermal, barrier and antimicrobial properties of the developed biocomposites were determined. The results of the investigation revealed that PBSA composites with 7 wt% and 10 wt% of the C98 additive were more suitable for the development of green packaging films because of their higher ultimate elongation values, better damping properties as well as their superior anti-microbial behavior. However, due to the lower thermal stability of the C98 additive as well as PBSA, the melt processing temperatures of the composites desirably should not exceed 120 °C. Additionally, by considering decreased moisture vapor barrier properties, it is recommended to perform further modifications of the PBSA-C98 composites through an addition of a nanoclay additive due to its excellent barrier properties and thermal stability.
当前的研究致力于开发用于食品包装应用的绿色抗菌聚合物生物复合材料，并对其进行表征。这些生物复合材料是通过熔融共混法制备的，以两种具有不同链刚度的琥珀酸酯聚合物基体为基础——聚丁二酸丁二醇酯（PBS）或其与20摩尔％聚己二酸丁二醇酯的共聚物（PBSA）。真菌壳寡糖（C98）和甲壳素壳聚糖（C95）用作抗菌添加剂。测定了所开发生物复合材料的流变性能，以确定最适合熔融加工的温度。此外，还测定了所开发生物复合材料的机械、热、阻隔和抗菌性能。研究结果表明，含有7 wt％和10 wt％C98添加剂的PBSA复合材料因其较高的极限伸长率值、更好的阻尼性能以及优异的抗菌性能，更适合用于开发绿色包装薄膜。然而，由于C98添加剂以及PBSA的热稳定性较低，复合材料的熔融加工温度理想情况下不应超过120°C。此外，考虑到水汽阻隔性能下降，建议通过添加具有优异阻隔性能和热稳定性的纳米粘土添加剂对PBSA-C98复合材料进行进一步改性。
