Biodegradable Dual-Network Cellulosic Composite Bioplastic Metafilm for Plastic Substitute

作者：Wang, Dong; Shi, Shuo; Mao, Yanyun; Lei, Leqi; Fu, Shaohai; Hu, Jinlian^*

来源：Angewandte Chemie - International Edition, 2023, 62(50).

DOI：10.1002/anie.202310995

• Cellulosic Composite Bioplastic Metafilm
• Dual-Network Strategy
• Flame Retardance
• Plastic Substitute
• Super Toughness

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-3), 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 degrees C), lower thermal expansion coefficient (15.19 ppm degrees C-1), 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. @@@ The novel dual-network design strategy is proposed to prepare a high-performance cellulosic composite bioplastic metafilm with exceptional mechanical toughness (23.5 MJ m-3), flame retardance, and solvent resistance. Moreover, it has a high maximum usage temperature (245 degrees C), lower thermal expansion coefficient (15.19 ppm degrees C-1), good biocompatibility, and natural biodegradation, which is competitive for plastic substitute.image

• 单位
  江南大学