Date of Publication :20th October 2016

Abstract: A new monomer bearing dialkyl groups, 3,3-dinonanoylbenzidine, when copolymerized with diacetyl monomers gave six new alternating conjugated copolymers, poly(2,2-arylene-4,4-bis(4-alkylquinolines))s, which are soluble in organic solvents. The thermal, electrochemical, photo physical, and electroluminescent properties of the new polyquinolines varied with the arylene linkage, including p-phenylene, 4,4-biphenylene, stilbene, 5,5-bithienylene, bis (thienyl) vinylene, and 3,7-phenothiazinylene. The new conjugated polymers combined high glass transition temperature (110-254 °C) with quasireversible electrochemical reduction from which 2.72-3.00 eV electron affinities were estimated. The optical band gap varied from 2.19 to 2.86 eV whereas the photoluminescence emission maximum varied from blue-green (477 nm) to deep red (646 nm). Some of the new polymers with alternating donor acceptor architecture showed strong intermolecular charge transfer. Electroluminescence of moderate brightness (up to 209 cd/m2) was achieved with blue-green, green, yellow, orange, and deep red colors depending on the arylene linkage of the copolymer. The new polyquinolines were also demonstrated as useful electron transport materials for the enhancement of polymer light-emitting diodes

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