Electronic and Ionic Transport in Polymers
Abstract
A comparative electrochemical charge transport and morphological study of poly (3-methylthiophene) has shown that the redox switching speed of the polymer is affected by the growth morphology which in turn is affected by the electrolyte. The anodic deactivation of polythiophenes has been examined using voltammetry, coulometry, FT-IR spectroscopy and chemical analysis. Molecular orbital calculations have uncovered steric interactions in polyisothianaphthene and polyisonaphthiophene which causes them to be nonplanar. A series of liquid crystalline polyazomethine ethers with two different highly conjugated mesogenic units and flexible alkyl spacers have been prepared and studied with carbon 13 CP/MAS NMR spectroscopy and by comparison with model compounds. Anomalous amino end groups, which give rise to distorted thermal behavior, could be end capped with benzaldehyde. These compounds were found to exhibit nematic mesomorphism. For the first time a transition metal nickel (II) and Copper (II) has been used to control the mesomorphic character of a liquid crystal. Thus, chelates using N, N'-bis(5-alkoxysalicyl-idene) ethylene diamine (Salen) show smectic mesomorphism whose transition temperatures could be controlled by changing the transition metal or by varying the length of the alkoxy unit. Keywords: Electronically conducting polymers, Liquid crystals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 12, 1988
- Accession Number
- ADA197142
Entities
People
- Dennis S. Marynick
- John R. Reynolds
- Krishnan Rajeshwar’
- Martin Pomerantz
- Timothy D. Shaffer
Organizations
- University of Texas at Arlington