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CHARACTERIZATION OF POLY[9,9-BIS(2-ETHYLHEXYL)-FLUORENE-CO-9 ETHYLCAPRONATE -FLUORENE-2,7 DIYL] CONDUCTING POLYMER

V. Melnig1,* , A. Farcas2, G. Rusu1, C. Baban1

Affiliation

  1. Faculty of Physics, “Al. I. Cuza” University, Bd. Carol I, Nr. 11A, Iasi, 700506, Romania
  2. “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda, Nr. 41A, Iasi, 700487, Romania

Abstract

A copolymer based on polyfluorene with pseudo-rotaxanes architecture in the side chain have been prepared through nickel(0)-catalyzed couplings between 2,7-dibromo-9-ethylcapronate fluorene/ 24-crown-8 as adduct, and 9,9-bis(2-ethylhexyl)-fluorene. Chemical modification of this copolymer was performed by saponification in the presence of LiOH solution resulting ionic structures. This copolymer has good solubility, in organic solvents (chloroform, tetrahydrofurane) and can be easily processed into homogeneous transparent thin film by usually method. The primer structure were investigated by 1H NMR and 13C NMR and InfraRed spectroscopy, photo conducting properties of in solution polymer by fluorescence technique and electrical conducting properties in film by UV-VIS transmission spectroscopy and by studying the temperature dependence of electrical resistance of the polymer in thin film. The polymer presents semiconducting properties with the activation energy of the electrical conduction of 1.41 eV that makes it suitable for electronic solid state devices..

Keywords

Polyfluorene, Ionic structure, Film forming, Crown ethers, Pseudo-rotaxanes.

Submitted at: Oct. 5, 2005
Accepted at: Nov. 24, 2005

Citation

V. Melnig, A. Farcas, G. Rusu, C. Baban, CHARACTERIZATION OF POLY[9,9-BIS(2-ETHYLHEXYL)-FLUORENE-CO-9 ETHYLCAPRONATE -FLUORENE-2,7 DIYL] CONDUCTING POLYMER, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 6, pp. 2875-2880 (2005)