Journal
EUROPEAN POLYMER JOURNAL
Volume 46, Issue 12, Pages 2282-2289Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2010.10.009
Keywords
Poly(p-phenylenevinylene) derivatives; Phosphine oxide; Blue shift; Copolymer; Color tuning
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Funding
- National Research Foundation (NRF) of Korea [2007-0056941]
- National Research Foundation of Korea [2007-0056941] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Poly(2-methoxy-(5-(6'-dimethylphosphonate)-hexyloxy)-1,4-phenylenevinylene-ran-2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PO-PPV) was synthesized via Heck coupling reaction of MPOHOB-2Br (1) (1-methoxy-(4-(6-dimethylphosphonate)-hexyloxy)-2,5-dibromobenzene), MEHOB-2Br (2) (1-methoxy-4-(6-bromohexyloxy)-2,5-dibromobenzene), and MEHOB-DV (4) (1-methoxy-4-(2'-ethylhexyloxy)-2, 5-divinylbenzene) by varying the molar ratios of monomers. The monomers and their intermediates were characterized by H-1 NMR, FT-IR, and melting point and elemental analyzer, and subsequent polymers by FT-IR. H-1 NMR, GPC, DSC, TGA, and solubility test. The optical (UV-vis, PL) and electrical properties (CV) of polymers were also evaluated. MEH-PO-PPV, containing phosphine oxide groups, exhibited better solubility, lower HOMO and LUMO levels, and larger band gaps. In addition, the PL emission gradually shifted to shorter wavelength, providing 570 (MEH-10PO-PPV), 519 (MEH-30PO-PPV), and of 465 nm (MEH-50PO-PPV) as the P=O content increased, compared with 598 nm (MEH-PPV). (C) 2010 Elsevier Ltd. All rights reserved.
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