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Poly (lactic acid)/thermoplastic polyurethane (PLA/TPU) ductile fibrous porous material was obtained by electrospinning, which has better mechanical properties than pure PLA fibrous material. The effects of TPU on the morphology, hydrophobicity, thermal and mechanical properties of the porous fibrous material were studied. After adding TPU, the fiber diameter increased significantly. The static water contact angle of electrospinning fiber decreased as TPU increased. The addition of TPU reduced the crystallinity of the material, but the crystallinity built up over the rise of TPU. TPU substantially improved the toughness of the material, and the PLA/TPU strain energy can be enhanced by nearly 17 times. When the PLA/TPU mass ratio was 10, the maximum tensile strength could reach 9.2 MPa, and if the mass ratio is 20, it holds the highest elongation at break of 153.1%. The preparation of electrospun PLA ductile porous material would be a reliable foundation for broadening the application range of PLA fibrous material. [ABSTRACT FROM AUTHOR]

Silver nanoparticles (AgNPs) are commonly incorporated in food packaging to enhance the shelf life of fruits and vegetables. In this work, three microstructures (spherical, hematocyte-like, and pie micromorphology) of AgNPs-polylactic acid (PLA) materials were fabricated on electrospun PLA-thermoplastic polyurethane (TPU) nanofiber film by electrospraying to reduce the safety risks and the cost of food packaging materials brought by AgNPs. Among them, the spherical AgNPs-PLA microsphere/PLA-thermoplastic polyurethane (TPU) hierarchical antibacterial film had good mechanical properties, a low AgNPs content of 0.6 wt%, the highest water contact angle of 140.1°, the highest bacteriostatic rate of 99% ± 1%, and the least bacterial adhesion. The test of this composite film in strawberry packaging successfully extended the shelf life to over 7 days. The hierarchical PLA material shows promising prospects in food packaging, and the preparation method may be a potential candidate for reducing the amount of antimicrobial agent required in antibacterial materials. [Display omitted] • AgNPs/PLA microspheres are made by turning the solvent ratio of the spinning solution. • PLA-TPU films loaded with spherical AgNPs-PLA microspheres exhibit good antimicrobial and anti-adhesion properties. • The hierarchical film with low AgNPs loading can be used as food packaging materials. [ABSTRACT FROM AUTHOR]

The properties of materials play a significant role in triboelectric nanogenerators (TENGs). Advanced triboelectric materials for TENGs have attracted tremendous attention because of their superior advantages (e.g., high specific surface area, high porosity, and customizable macrostructure). These advanced materials can be extensively applied in numerous fields, including energy harvester, wearable electronics, filtration, and self‐powered sensors. Hence, designing triboelectric materials as advanced functional materials is important for the development of TENGs. Herein, the structural modification methods based on electrospinning to improve the triboelectric properties and the latest research progress in this kind of TENGs are systematically summarized. Preparation methods and design trends of nanofibers, microspheres, hierarchical structures, and doping nanomaterials are highlighted. The factors influencing the formation and properties of triboelectric materials are considered. Furthermore, the latest progress on the applications of TENGs is systematically elaborated. Finally, the challenges in the development of triboelectric materials are discussed, thereby guiding researchers in the large‐scale application of TENGs. [ABSTRACT FROM AUTHOR]