Preparation and dielectric properties of sulfonated poly(aryl ether ketone)/acidified graphite nanosheet composites

• Published in: Journal of applied polymer science Vol. 131; no. 6; pp. np - n/a
• Main Authors: Jiang, Wenlong, Liu, Yu, Wang, Jinfeng, Wang, Qitong, Zhang, Yunhe, Guan, Shaowei
• Format: Journal Article
• Language: English
• Published: Hoboken, NJ Blackwell Publishing Ltd 15.03.2014; Wiley; Wiley Subscription Services, Inc
• Subjects: Acidification; Applied sciences; Composites; dielectric properties; electrochemistry; Exact sciences and technology; Forms of application and semi-finished materials; Materials science; Polymer industry, paints, wood; Polymers; Technology of polymers; Elastic modulus; Volume fraction; electrochemistry; Dielectric properties; Mechanical properties; Ether copolymer; Dispersion reinforced material; Experimental study; Composite material; Tensile strength; Thermal stability; Surface treatment; Ketone copolymer; Sulfonate copolymer; Thermal properties; composites; Preparation; Graphite; Aromatic copolymer; Alternating copolymer; Percolation; Oxidation; Permittivity
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.40028

ABSTRACT Percolative dielectric composites of sulfonated poly(aryl ether ketone) (SPAEK) and acidified graphite nanosheets (AGSs) were fabricated by a solution method. The dielectric constant of the as‐prepared composite with 4.01 vol % AGSs was found to be 330 at 1000 Hz; this was a significant increase compared to that of pure SPAEK. Through the calculation, a low percolation threshold of the AGS/SPAEK composite was confirmed at 3.18 vol % (0.0318 volume fraction) AGSs; this was attributed to the large surface area and high conductivity of the AGSs. Additionally, our percolative dielectric composites also exhibited good mechanical performances and good thermostability, with a tensile strength of 71.7 MPa, a tensile modulus of 1.91 GPa, a breaking elongation of 16.4%, and a mass loss temperature at 5% of 336°C. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014, 131, 40028.