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- W2050489312 endingPage "4263" @default.
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- W2050489312 abstract "Abstract New aromatic diyne monomers of 1,4‐diethynyl‐2,5‐(dihexyloxy)benzene ( 1 ), 1,6‐diethynyl‐2‐(hexyloxy)naphthalene ( 2 ), and 9,9‐bis(4‐ethynylphenyl)fluorene ( 3 ) are synthesized. Their homopolymerizations and copolymerizations with 1‐octyne ( 4 ) or phenylacetylene ( 5 ) are effected by TaBr 5 –Ph 4 Sn and CpCo(CO) 2 – hν , giving soluble hyperbranched polyarylenes with high molecular weights ( M w up to ∼ 2.9 × 10 5 ) in high yields (up to 99%). The structures and properties of the polymers are characterized and evaluated by IR, NMR, UV, PL, and TGA analysis. The polymers show excellent thermal stability ( T d > 400 °C) and carbonize when pyrolyzed at 900 °C. Upon photoexcitation, the polymers emit deep blue light in the vicinity of ∼400 nm with fluorescence quantum yields up to 92%. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4249–4263, 2007" @default.
- W2050489312 created "2016-06-24" @default.
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- W2050489312 date "2007-07-31" @default.
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- W2050489312 title "Polycyclotrimerization of aromatic diynes: Synthesis, thermal stability, and light-emitting properties of hyperbranched polyarylenes" @default.
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- W2050489312 doi "https://doi.org/10.1002/pola.22246" @default.
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