A novel high permittivity percolative composite with modified MXene. (12th June 2019)

• Record Type: Journal Article
• Authors: Shao, Jing; Wang, Jing-Wen; Liu, Da-Nian; Wei, Lei; Wu, Sen-Qiang; Ren, Hua
• Is Part Of: Polymer. Volume 174(2019)
• Page Start: 86
• Page End: 95
• Publication Date: 2019-06-12
• Subjects: Acrylic resin -- Ti3C2Tx -- High permittivity; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2019.04.057
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: A high permittivity acrylic resin (AE)-based percolative composite with two-dimensional (2D) MXene nanosheets as the conducting fillers was fabricated. The Ti3 C2 Tx MXene nanosheets were delaminated (referred to d-Ti3 C2 Tx ) and then modified with polypyrrole (PPy). The d-Ti3 C2 Tx /AE and PPy- d -Ti3 C2 Tx /AE composite films with different filler loadings were obtained with the solution casting method. The dielectric constants of 6.36 vol %d-Ti3 C2 Tx /AE and 5.98 vol %PPy- d -Ti3 C2 Tx /AE are 493 and 265 at 10 2 Hz, respectively, approximately 140 and 75 times of pure AE (3.5). Meanwhile, the dielectric loss of PPy- d -Ti3 C2 Tx /AE composite maintains at a relative low level (0.23 at 10 3 Hz) when the volume fraction of PPy- d -Ti3 C2 Tx gets close to the percolation threshold ( f c = 6.39). The large enhancement in dielectric constant of composite is closely relevant to the microcapacitor effect and the free charge accumulation caused by the formation of interfaces between the conducting fillers and polymer matrix. Graphical abstract: Image 1 Highlights: Using MXene as the conductive filler and acrylic resin as the polymer matrix to prepare a novel dielectric material. MXene was intercalated with polypyrrole (PPy) to synthesize a new conductive filler PPy-MXene which enhanced the MWS effect. The MXene-polymer percolative composite with excellent dielectric property was obtained.