Synthesis of high glass transition temperature fluorescent polyarylene ether nitrile copolymers

摘要

A novel series of fluorescent copolymers were synthesized by the nucleophilic aromatic substitution polymerization of 2, 6-dichlorobenzonitrile with different ratios of phenolphthalein to phenolphthalin. The derived copolymers showed good solubility in common organic solvents at room temperature and good film-forming properties. These copolymers were characterized by Fourier transform infrared, proton nuclear magnetic resonance, ultraviolet-visible absorption, fluorescence spectroscopy, differential scanning calorim-etry and thermogravimetric analysis. They had high glass transition temperatures ranging from 237 °C to 260 °C and good thermal stability with the 5% weight loss temperatures in the range of 373-455 °C. Furthermore, the copolymers exhibited characteristic bimodal ultraviolet-visible absorption and unimodal fluorescence emission in both solution and film states.