Synthesis of Methacrylic Monomers Bearing Stilbenoid Chromophore and Their Free-Radical Polymerization To Give Luminescent Polymers

Abstract

In the present paper, we report the synthesis of two new methacrylates and their efficient free-radical polymerization to luminescent polymers. They dissolved in common organic solvents such as THF, dichloromethane, chloroform, and toluene and had relatively low Tg values (52−87 °C). In addition, they showed a satisfactory thermal stability, being stable up to 278−325 °C in N2 or air and afforded anaerobic char yields of 47−73% at 800 °C. The optical properties of polymers were investigated both in solution and in thin film, utilizing the UV−vis, the PL excitation, and PL spectroscopy. The polymers behaved as violet-blue and violet-greenish emitting materials. Their PL spectra displayed maxima in solution at 397 or 457 nm and in thin film at 413 or 507 nm. The low-temperature PL spectra in solution were red-shifted by 7−15 nm in comparison with the respective room-temperature spectra, and for one polymer, they displayed a new peak due to the reduced rotation. The PL quantum yields in solution were up to 0...