Highly oriented films of poly(p-phenylene vinylene) (PPV) were prepared by uniaxial stretching during thermal conversion of a water-soluble sulfonium polyelectrolyte precursor polymer. The precursor films were stretched up to seven times their original length. Doping of the stretched PPV films was achieved by dipping into a 0.12 M solution of FeC13 in nitromethane. The d.c. electrical conductivity of these doped films was measured as a function of the doping time and as a function of the temperature between 80 and 300 K. Compared with the maximum conductivity obtained in unstretched PPV films doped with FeCI a (ad? = 35 f~- 1 cm 1), the stretched films showed a higher conductivity (ad? = 230 ~- 1 cm 1) when measured along the stretching orientation. The molecular structure and the changes caused by doping of stretched PPV films were studied by infra-red dichroism, transmission electron microscopy and electron diffraction.
Посилання на статтю:
Molecular orientation and conductivity in highly oriented poly(p-phenylene vinylene) / J. Briers, W. Eevers, P. Cos and H. J. Geise // Polymer. – 1994. – Vol 35. – P. 4569-4572.