Department of Biomedical Engineering, City University of Hong Kong Kowloon, Hong Kong SAR, 999077, China.
Key Laboratory of Eco-Textile, College of Textile Science and Engineering, Jiangnan University, Jiangsu, 214122, China.
Angew Chem Int Ed Engl. 2023 Dec 11;62(50):e202310995. doi: 10.1002/anie.202310995. Epub 2023 Nov 10.
With the escalating environmental and health concerns over petroleum-based plastics, sustainable and biodegradable cellulosic materials are a promising alternative to plastics, yet remain unsatisfied properties such as fragility, inflammability and water sensitivity for practical usage. Herein, we present a novel dual-network design strategy to address these limitations and fabricate a high-performance cellulosic composite bioplastic metafilm with the exceptional mechanical toughness (23.5 MJ m ), flame retardance, and solvent resistance by in situ growth of cyclotriphosphazene-bridged organosilica network within bacterial cellulose matrix. The phosphorus, nitrogen-containing organosilica network, verified by the experimental and theoretical results, plays a triple action on significantly enhancing tensile strength, toughness, flame retardance and water resistance of composite bioplastic metafilm. Furthermore, cellulosic bioplastic composite metafilm demonstrates a higher maximum usage temperature (245 °C), lower thermal expansion coefficient (15.19 ppm °C ), and better solvent resistance than traditional plastics, good biocompatibility and natural biodegradation. Moreover, the composite bioplastic metafilm have a good transparency of average 74 % and a high haze over 80 %, which can serve as an outstanding substrate substitute for commercial polyethylene terephthalate film to address the demand of flexible ITO films. This work paves a creative way to design and manufacture the competitive bioplastic composite to replace daily-used plastics.
随着人们对石油基塑料的环境和健康问题的日益关注，可持续和可生物降解的纤维素材料是塑料的一种有前途的替代品，但仍存在脆性、易燃性和对水敏感等不理想的性质，限制了其实际应用。在此，我们提出了一种新的双网络设计策略，通过在细菌纤维素基质中原位生长环三磷腈桥联有机硅网络，来解决这些局限性，并制备出具有优异机械韧性（23.5 MJ m ）、阻燃性和耐溶剂性的高性能纤维素复合生物塑料金属膜。磷、氮含有的有机硅网络通过实验和理论结果得到验证，对显著提高复合生物塑料金属膜的拉伸强度、韧性、阻燃性和耐水性有三重作用。此外，纤维素基生物塑料复合金属膜的最高使用温度（245°C）更高，热膨胀系数（15.19 ppm°C）更低，耐溶剂性优于传统塑料，具有良好的生物相容性和可自然生物降解性。此外，该复合生物塑料金属膜的平均透光率为 74%，雾度超过 80%，可作为商业聚对苯二甲酸乙二醇酯薄膜的出色替代品，满足了对柔性 ITO 薄膜的需求。这项工作为设计和制造具有竞争力的生物塑料复合材料以替代日常使用的塑料铺平了道路。
