Abstract: Anovel bisphenol like compound, 4-(3,5-dimethyl-4-hydroxylphenyl)-2,3 phthalazine1 none (DM HPPZ) was used to successfully prepare a kind of thermal stable polyarylethers with 4,4'-diflourodiphenylketone(Ⅰ) and 4,4'-dichlorodiphenylsulphone(Ⅱ) via nucleophilic substitution. High molecular weight polymers with inherent viscosity more than 44.2-75 mL/g are acquired in 7-75 h. These polymers exhibit a higher glass transition temperature( T_g=568-595 K) than unsubstituted polymers( T_g=536-578 K) and good thermostability with 5% weight loss at the temperature above 689 Kin nitrogen. Also the copolymers(PPESK) with different ratios of Ⅰ to Ⅱ aimed at the combination of the excellent strength of PPEKand the high temperature resistance of PPESare obtained. The polymers have a tensile strength in the range of 454-850 MPa. They are readily soluble in polar aprotic solvents such as chloroform, N,Ndimethylacetamide etc, and are easily cast into flexible, transparent films from them.

Key words: Polyarylether, Heterocyclic polymer, Synthesis, Solubility