%0 Journal Article
%T Synthesis and Characterization of Well-Defined Soluble - and -Functionalized Polymers via RAFT Copolymerization
%A Chengchao Wang
%A Wei Zhang
%A Nianchen Zhou
%A Yansheng Qiu
%A Zhengping Cheng
%A Xiulin Zhu
%J International Journal of Polymer Science
%D 2010
%I Hindawi Publishing Corporation
%R 10.1155/2010/340926
%X The reversible addition-fragmentation chain transfer (RAFT) copolymerizations of 2-((8-hydroxyquinolin-5-yl)methoxy)ethyl methacrylate (HQHEMA) with styrene (St) or methyl methacrylate (MMA) were successfully carried out in the presence of 2-cyanoprop-2-yl dithionaphthalenoate (CPDN). The polymerization behaviors showed the typical living natures by the first-order polymerization kinetics, the linear dependence of molecular weights of the polymers on the monomer conversions with the relatively narrow molecular weight distributions , and the successful chain extension experiments. The soluble polymers having tris(8-hydroxyquinoline)aluminum ( ) and bis(8-hydroxyquinoline) znic(II) ( ) side chains were obtained via complexation of the polymers with aluminium isopropoxide or zinc acetate in the presence of monomeric 8-hydroxyquinoline, which had strong fluorescent emission at 520£¿nm. The obtained polymers were characterized by GPC, NMR, UV-vis, and fluorescent spectra. 1. Introduction In recent years, organic electroluminescence (EL) display devices have attracted more intensive attention as a promising technology for flat panel display [1]. Many emitting materials, including low-weight molecules and polymers, have been designed and utilized in fabricating organic light emitting diodes (OLEDs) [2¨C5]. Among them, metal 8-hydroxyquinoline (Mqn) chelates, especially for tris(8-hydroxyquinoline)aluminum (Alq3), and bis(8-hydroxyquinoline) znic(II) (Znq2) have been extensively investigated for their high stabilities, good emissions, and electron-transporting properties [6¨C8]. Compared with low-weight 8-hydroxyquinoline (Mqn) chelate, the polymers containing Mqn pendant groups combine the fluorescent property of Mqn and the processability of the polymer [6, 7, 9]. Up to now, two types of Mqn-containing polymers (main-chain type and side-chain type) have been reported. Yamamoto and Yamaquchi reported the synthesis of poly(quinolinol) [10] and poly(aryleneethynylene) [11] containing 8-quinolinol moieties. On the other hand, various side-chain type polymers including poly(arylene ether) [12], copolymers of 7-allyl-, or 7-(2-methylvinyl)-functionalized derivatives of 8-hydroquinoline with styrene [13], functionalized polystyrene [14], and copolymers of methacrylates having 8-hydroxyquinoline moieties were also successfully prepared [15]. Furthermore, Mqn-containing polymers were obtained by the reaction of the above polymers with metal compounds in the presence of monomeric 8-hydroxyquinoline. Meyers and Weck, reported the synthesis of an Alq3-functionalized polymer
%U http://www.hindawi.com/journals/ijps/2010/340926/