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Indexed by:Journal Papers

Date of Publication:2020-12-29

Journal:POLYMER

Volume:198

ISSN No.:0032-3861

Key Words:Poly (aryl ether ketone ketone)s; Bis-phthalazinone; Pendent phenyl; Solubility; Thermo-resistance

Abstract:A series of novel N-heterocyclic copoly (aryl ether ketone ketone)s containing pendent phenyl groups and bis-phthalazinone moieties (P-BNP) with high molecular weight were successfully synthesized via solution condensation from 4-(3'-phenyl-4'-hydroxyphenyl)-2,3-phthalazin-1-one, 4,4'-di(4'-1(2H)-phthalazinone)-1,1'-biphenyl and 1,4-bis(4'-fluorobenzoyl)benzene. The properties of P-BNPs were identified by thermogravimetric analysis (TGA), differential scanning calorimetry analysis (DSC), and dynamic thermomechanical analysis (DMA) etc. The polymer exhibits excellent thermo-stability in both nitrogen and air. The glass-transition temperature (T-g) is in the range of 240-290 degrees C, copolymers performing a presentable thermo-resistance. Moreover, copolymers can be dissolved in chloroform and N-methyl-2-pyrrolidone (NMP), exhibiting excellent film-forming property. Simultaneously, copolymers possess favorable mechanical properties. The introduction of pendent phenyl moieties enhances the mobility of molecular chains and solubility of copolymers. The introduction of rigid bis-phthalazinone units enhances the thermo-resistance and mechanical properties of copolymers. Rational allocation of rigid units and side groups content will optimize the comprehensive properties of high-performance polymers.