Novel Poly(phthalazinone thioether sulfone/ketone)s: Synthesis, solubility and thermostability

A novel series of poly(phthalazinone thioether sulfone/ketone)s were prepared by nucleophilic substitution of 4-(4′-thiolphenyl) phthalazinone with different di-halogen monomers. The achieved copolymers can dissolve in common organic solvents such as N,N-dimethylacetamide, N-methylpyrrolidone and chloroform at room temperature. The chemical structures of the copolymers were characterized by FT-IR and NMR, and their thermal properties were investigated by TGA and DSC. The results demonstrated that they have good thermal stability with the glass transition temperatures ＞208 °C and the 5 % weight loss temperatures in the range of 490–504 °C.