Hierarchically reinforced biopolymer composite films as multifunctional plastics substitute
Hierarchically reinforced biopolymer composite films as multifunctional plastics substitute
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DOI：
10.1016/j.xcrp.2023.101732
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发表时间：
2023-12
影响因子：
8.9
通讯作者：
Y. Kotb;O. Velev
中科院分区：
文献类型：
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作者：
Y. Kotb;O. Velev
用由丰富和可持续的原材料制成的可生物降解替代品取代合成塑料是一项具有高度社会重要性的挑战。我们报道了一类由纳米和微米级增强的天然来源的生物聚合物制成的高性能多功能复合膜。这些膜由琼脂糖基质制成，该琼脂糖基质用来自壳聚糖的分级分支的软树枝状胶体（SDCs）增强。由于SDC纳米纤丝的高度缠结的分级网络，增强复合材料具有优异的性能，其韧性比未增强的琼脂糖高4倍以上，可见光透射率高，水稳定性改善，并且具有显著的杀菌活性。因此，这些增强的生物聚合物复合材料可以匹配或超过普通合成聚合物膜的优异的机械、阻隔和光学性能。我们还证明了这种复合材料在受控环境中的土壤生物降解性。研究结果表明，制造天然来源的复合材料可以作为石油基塑料的替代品。
The replacement of synthetic plastics with biodegradable alternatives made from abundant and sustainable raw materials is a challenge of high societal importance. We report a class of high-performance multifunctional composite films made of nano- and microscale reinforced naturally sourced biopolymers. These films are made of an agarose matrix reinforced with hierarchically branched soft dendritic colloids (SDCs) from chitosan. Owing to the highly entangled hierarchical network of the SDC nanofibrils, the reinforced composite has excellent performance with more than 4× higher toughness than non-reinforced agarose, high visible light transmittance, improved hydrostability, and remarkable bactericidal activity. Thus, these reinforced biopolymer composites could match or exceed the excellent mechanical, barrier, and optical properties of common synthetic polymer films. We also demonstrate the soil biodegradability of this composite material in a controlled environment. The results suggest a universal strategy for manufacturing natural-source composite materials that could serve as substitutes for petroleum-based plastics.