Accession Number : ADA182277

Title :   Electronic and Ionic Transport in Polymers.

Descriptive Note : Quarterly technical rept. no. 3, 16 Mar-15 Jun 87,

Corporate Author : TEXAS UNIV AT ARLINGTON DEPT OF CHEMISTRY

Personal Author(s) : Pomerantz,Martin ; Reynolds,John R ; Rajeshwar,Krishnan ; Marynick,Dennis S ; Shaffer,Timothy D

PDF Url : ADA182277

Report Date : 10 Jun 1987

Pagination or Media Count : 7

Abstract : An optoelectrochemical study of poly (1,2-dithienylethylene) showed a lower band gap than the parent polythiophene and that it is electrochemically switchable between oxidized and reduced states. Free standing films exhibit conductivities up to 15/Scm. The quartz crystal microbalance has been used to monitor charge transport in polypyrrole and the self-doped copolymer, poly (pyrrole-co-3-purrol-1-yl)propanesulfonate in a variety of electrolytes. Scanning electron microscopy has shown that the morphology of these polymers is similar. A recently developed spectroelectrochemical technique has demonstrated that proton migration accompanies redox switching in polpyrrole. PRDDO calculations of many N-substituted pyrroles has shown that the oxidation potential of benzylpyrroles most closely match that of pyrrole. C-1 binding energies of polypyrrole with alpha-alpha linkages and with alpha-beta and beta-beta defects have been calculated for comparison with XPS data. An extended series of metal Cu(II) and Ni(II) chelate model compounds of bis(2,5-dihydroxybenzaldehyde) ethylenediimine has been prepared which contain ether end-cap spacers of 6-10 methylene units. Thermal analysis has revealed that the Ni(II) complexes show only nematic behavior while the Cu(II) complexes show both smectic and nematic behavior. Keywords: Electronically, Conducting, Polymers, High energy, Dielectric, Liquid crystalline, Poly.

Descriptors :   *CHARGE TRANSFER, *ELECTRON TRANSPORT, *POLYMERS, IONS, TRANSPORT PROPERTIES, HIGH ENERGY, BEHAVIOR, LIQUID CRYSTALS, THIOPHENES, MIGRATION, PROTONS, ELECTROLYTES, FILMS, OXIDATION, PYRROLES, SWITCHING, THERMAL ANALYSIS, ELECTRONIC SCANNERS

Subject Categories : Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE