High-Strength, High-Barrier Bio-Based Polyester Nanocomposite Films by Binary Multiscale Boron Nitride Nanosheets

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Abstract

Owing to the inferior dispersibility of boron nitride nanosheets (BNNSs) and weak interfacial interaction with the matrix, the performance of BNNS-based composites is usually far below theoretically predicted values. Here, binary multiscale BNNSs (LDH-BNNSs) fillers are synthesized through in situ growth of layered double hydroxide (LDH) on the BNNSs’ surfaces. LDH-BNNSs with a multiple mosaic interface show superior dispersion of nanosheets in matrix and extraordinary filler-matrix bonding. Density functional theory simulations reveal the stable dispersion mechanism of LDH-BNNSs. Moreover, the bio-based poly(ethylene furandicarboxylate) composites with 0.2 wt% LDH-BNNSs loading exhibit simultaneous improvements in tensile strength (≈140 MPa), Young's modulus (≈6.5 GPa), toughness (≈2.0 MJ m−3), and gas barrier properties. Regulation of the interfacial structures of binary multiscale BNNSs significantly increases the filler utilization of the nanosheets, leading to extraordinary stress transfer efficiency and a physical shielding effect. Therefore, this simple, efficient, and novel strategy has promised in enhancing composite performance, and it provides a novel way to develop strong, tough, and high-barrier bio-based polyester composites.

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Ding, J., Zhao, H., Shi, S., Su, J., Chu, Q., Wang, H., … Zhu, J. (2024). High-Strength, High-Barrier Bio-Based Polyester Nanocomposite Films by Binary Multiscale Boron Nitride Nanosheets. Advanced Functional Materials, 34(1). https://doi.org/10.1002/adfm.202308631

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