Preparation of Hole Transporting Polymer Having Triphenylamine Moieties = Preparation of Hole Transporting Polymer Having Triphenylamine Moieties

다국어 초록 (Multilingual Abstract)

New classes of hole transport polymers were prepared through copolymerization of N-(4-methylphenyl)-diphenylamine (MTPA) or N,N’-diphenyl-N,N'-bis(4-methylphenyl)-benzidine (MTPD) with benzaldehyde, bis(bromomethyl)arene, or 1,4-divinylbenzene. Polymers with molecular weight higher than 10,000 were obtained in high yield in the presence of acid catalysts. The resulting polymers are soluble in the conventional solvents and exhibit high thermal stability. It was confirmed by H-1 NMR spectroscopy that TPA or TPD units are linked with comonomers mainly at the p-positions of unsubstituted phenyl ring. UV-vis spectroscopy and cyclic voltammetry showed that the optical and electrochemical properties of these polymers were almost identical as the starting triphenylamine derivatives. Furthermore, two-layer EL devices were fabricated, in which polymers were spin cast onto the ITO anode as a hole transport layer and Alq was vapor-deposited as a light-emitting and electron transport layer.