Amorphous Copolyester with Ultrahigh Glass Transition Temperatures Based on 2,6‐naphthalenedicarboxylic Acid And Bis[4‐(2‐Hydroxyethoxy) Phenyl] Sulfone‐Derived Building Blocks

Abstract

High performance copolyesters with ultrahigh glass transition temperature (T_g) are crucial in emerging technology fields such as electronic devices, automotives and coatings. In this paper, a series of poly(ethylene bis[4‐(2‐hydroxyethoxy) phenyl] sulfone 2,6‐naphthalate) (PESNs) with high T_g were synthesized by the copolymerization of 2,6‐naphthalenedicarboxylic acid (2,6‐NDA), bis[4‐(2‐hydroxyethoxy) phenyl] sulfone (BHEBS), and ethylene glycol (EG). The chemical structure and compositions of prepared copolymers were confirmed by hydrogen nuclear magnetic spectra (¹H NMR). T_g of copolyesters (121.1‐152.2 °C) depended on composition and was comparable to that of polyetheretherketone (PEEK: 143 °C), increasing as the amount of BHEBS units was increased. The Fox, Gordon‐Taylor and Kwei equations were employed to evaluate the variation of T_g with respect to the composition of PESNs, respectively. In these three equations, the data calculated by Kwei equation fit the actual results best, attributed to the peculiar dielectric properties. In addition, PESNs showed good solubility in 1,1,2,2‐tetrachloroethane, DMF and DMSO, which was conducive to meet the needs of polyester coating.

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