Dielectric properties of polyethersulfone copolymers containing bisphenol S and six fluorine hexafluorobisphenolA (6AF) segments

• Published in: Journal of polymer research Vol. 27; no. 9
• Main Authors: Xia, Jialing, Pu, Zejun, Zheng, Xiaoyi, Hu, Linqing, Zeng, Xianguang, Zhong, Jiachun
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 2020; Springer Nature B.V
• Subjects: Aromatic compounds; Bisphenols; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Copolymers; Dielectric properties; Fluorine; Glass transition temperature; Industrial Chemistry/Chemical Engineering; Original Paper; Permittivity; Polycondensation reactions; Polyethersulfones; Polymer Sciences; Solvents; Substitution reactions; Tensile strength; Thermal decomposition; Thermal decomposition temperature; Fluorinated polyethersulfone; Copolymers; Dielectric properties
• ISSN: 1022-9760; 1572-8935
• DOI: 10.1007/s10965-020-02267-2

In this study, a series of fluorinated polyethersulfone (PES-6AF) copolymers with intrinsic low-dielectric-constants are prepared by the introduction of fluorine-containing group, which are derived from the polycondensation reaction of 4,4′-dichlorophenyl sulfone (DCS), bisphenol S (BPS) and six fluorine hexafluorobisphenolA (6AF) compounds by nucleophilic aromatic substitution. Different proportions of PES-6AF copolymers show high glass transition temperatures ( T g ) ranging from 206 °C to 230 °C, and the thermal decomposition temperatures of PES-6AF copolymers are up to 500 °C under N 2 atmospheres. The PES-6AF copolymers display outstanding tensile strength (62–69 MPa). Added different proportions of 6AF into the PES-6AF copolymers could improve dielectric property and decrease dielectric constant (k) from 3.6 to 2.5 at 1 kHz. In addition, the dielectric properties were found to be relatively stable until the T g , it is because that the 6AF units were existed in the molecular backbone. Furthermore, the PES-6AF copolymers were soluble in many common solvents and could be made the molten films using DMF as solvent.