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

作者：Ding, Jiheng^*; Zhao, Hongran; Shi, Shuo; Su, Jing; Chu, Qinchao; Wang, Hao; Fang, Bin; Miah, Mohammad Raza; Wang, Jinggang^*; Zhu, Jin^*

来源：Advanced Functional Materials, 2024, 34(1): 2308631.

DOI：10.1002/adfm.202308631

• binary multiscale interfaces
• bio-based polyester composites
• boron nitride nanosheets
• high barrier
• high strength

\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 (approximate to 140 MPa), Young's modulus (approximate to 6.5 GPa), toughness (approximate to 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.

• 单位
  江南大学; 中国科学院; 中国科学院研究生院; 中国科学院宁波材料技术与工程研究所