Improved the dielectric properties of thermoplastic polyurethane elastomer filled with MXene nanosheets and BaTiO3 nanofibers. (July 2022)

• Record Type: Journal Article
• Authors: Luo, Zhaoxia; Zhang, Liqun; Liang, Yongri; Wen, Shipeng; Liu, Li
• Is Part Of: Polymer testing. Volume 111(2022)
• Publication Date: 2022-07
• Subjects: Dielectric elastomer (DE) -- MXene -- BaTiO3 nanofiber -- Electrospinning -- Composites; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2022.107592
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: To achieve high deformation under a low electric field intensity is still a big challenge for the dielectric elastomers (DE) potentially used in artificial electronic skin and artificial muscles. Herein, poly-dopamine (PDA) modified 1D barium titanate (BT@PDA) nanofibers and 2D MXene nanosheets with high aspect ratio and large dipole moment were fabricated, and introduced into TPU elastomers. Results showed that the interfacial polarization and micro-capacitor structure formed by MXene sheets lead to the high dielectric constant, and high dielectric loss of MXene/TPU composites with low modulus. The interfacial polarization caused by BT@PDA nanofibers resulting in high dielectric constant and low dielectric loss of BT@PDA/TPU composites with high modulus. Combing the advantages of the two fillers, the MXene/BT@PDA/TPU composites showed high dielectric constant, low dielectric loss, low modulus. The electrical sensitivity factor of 0.5 wt% MXene/5 wt% BT@PDA/TPU composite (11.38) was much higher than the sum of that of 0.5 wt% MXene/TPU (1.73) and 5 wt% BT@PDA/TPU (4.35) composites at a low filler content, showing the 0.5 wt% MXene/5 wt% BT@PDA/TPU dielectric composite had a large deformation under a low electric field. This work can provide an effect strategy to design DE nanocomposites with good deformation performance. Graphical abstract: Image 1 Highlights: Few-layer MXene and BaTiO3 nanofibers were codoped in TPU dielectric elastomer. Interface polarization and the micro-capacitor effect enhanced dielectric constant. Synergistic effect was found between the codoped fillers.