Mikhail Koreshkov, Yuuki Takatsuna, Alexander Bismarck, Ines Fritz, Erik Reimhult and Ronald Zirbs
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Here, we demonstrate that the utilization of simple oligo-lactic acid modified bacterial cellulose (OLLA-g-BC) enhances the overall properties of commercial PLA and PHBV to a degree where it can directly compete with established conventional food packaging polymers. The key factor driving this enhancement lies in the uniform dispersion of the nanofiller throughout the bulk polymer, as visualized and confirmed through innovative 3D serial block face SEM analysis. The addition of 5% OLLA-g-BC increased the biodegradation rate of the nanocomposites without compromising their mechanical performance, leading to a ∼12% increase in Young's modulus for PLLA and a ∼14% decrease for PHBV. Filler incorporation resulted in a ∼23% and ∼45% decrease in oxygen permeability for PLLA and PHBV, respectively, while a ∼12% increase in water vapor permeability was observed for PLLA. 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引用次数: 0
摘要
在聚合物中加入纳米级填充材料通常可以提高聚合物的机械性能、改变阻隔特性并增强消费品的视觉吸引力。越来越多的人认识到,一次性塑料和包装材料必须从化石基、不可生物降解的聚合物转向完全可再生、可回收和/或可生物降解的替代品,如聚乳酸(PLA)或 PHBV,这凸显了开发新型、高性价比和可扩展填充材料的迫切性。在这里,我们证明了利用简单的低聚乳酸改性细菌纤维素(OLLA-BC)可以增强商用聚乳酸和 PHBV 的整体性能,使其可以直接与成熟的传统食品包装聚合物竞争。驱动这种增强的关键因素在于纳米填料在整个聚合物中的均匀分散,这一点通过创新的三维连续块面 SEM 分析得到了证实。对机械性能、阻隔性能和生物降解性的深入研究清楚地表明,这些 OLLA 接枝细菌纤维素复合材料可为实现完全循环的零废弃经济做出重大贡献。
Sustainable food packaging using modified kombucha-derived bacterial cellulose nanofillers in biodegradable polymers†
Incorporating nanoscale filler materials into polymers usually enhances mechanical properties, alters barrier characteristics, and enhances the visual appeal of consumer polymers. The growing recognition of the imperative to shift away from fossil-based, non-biodegradable polymers in single-use plastics and packaging materials toward fully renewable, recyclable, and/or biodegradable alternatives like PLA or PHBV has underscored the urgent need for the development of new, cost-effective, and scalable filler materials. Here, we demonstrate that the utilization of simple oligo-lactic acid modified bacterial cellulose (OLLA-g-BC) enhances the overall properties of commercial PLA and PHBV to a degree where it can directly compete with established conventional food packaging polymers. The key factor driving this enhancement lies in the uniform dispersion of the nanofiller throughout the bulk polymer, as visualized and confirmed through innovative 3D serial block face SEM analysis. The addition of 5% OLLA-g-BC increased the biodegradation rate of the nanocomposites without compromising their mechanical performance, leading to a ∼12% increase in Young's modulus for PLLA and a ∼14% decrease for PHBV. Filler incorporation resulted in a ∼23% and ∼45% decrease in oxygen permeability for PLLA and PHBV, respectively, while a ∼12% increase in water vapor permeability was observed for PLLA. Intensive investigations into the performance of nanocomposites clearly indicate that OLLA-grafted bacterial cellulose compound materials could significantly contribute to the realization of a fully circular, zero-waste economy.