Synthesis and properties of poly(phthalazinone ether ketone ketone)s containing pendent methyl groups

A new class of poly(phthalazinone ether ketone ketone)s has been prepared by aromatic nucleophilic displacement polycondensation from an activated dichloride monomer 1 and several phthalazinone containing bisphenol-like monomers 2a–c. The formation of the polymers was confirmed by FT-IR and 1H NMR spectra, and the synthesized polymers 3a–c have good solubility in common organic solvents, high glass transition temperatures (Tgs) in range of 239–255 °C and excellent thermal stability. Moreover, tough, flexible and transparent thin films can be readily prepared by both spin coating and solution casting approach. Good solubility in common organic solvents coupled with salient thermal stability demonstrates this class of polymers could be excellent candidate for high performance polymers.