Accession Number : ADA310161

Title :   Investigation of Molecular and Supermolecular Structure in Template-Synthesized Polypyrrole Tubules and Fibrils.

Descriptive Note : Interim rept.,

Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY

Personal Author(s) : Menon, Vinod P. ; Lei, Junting ; Martin, Charles R.

PDF Url : ADA310161

Report Date : JUN 1996

Pagination or Media Count : 46

Abstract : Nanotubules and nanofibrils of polypyrrole were chemically synthesized using the pores of nanoporous polycarbonate membrane filters as templates. We have previously shown that such 'template-synthesized' nanofibrils of polypyrrole can have enhanced conductivities relative to more conventional forms of the polymer (e.g. thin films). Furthermore, we have shown that this enhancement in conductivity is critically dependent on the diameter of the nanofibrils; the narrowest diameter fibrils show the greatest enhancements in conductivity. In this paper, we explore the genesis of this enhancement in conductivity by determining the relative conjugation lengths in the polypyrrole fibrils using FTIR and UV-Visible-NIR spectroscopies. Using polarized infrared absorption and FTIR spectroscopies, we have followed the evolution of polymer chain orientation and conjugation length with polymer chain growth on the pore walls of the template membrane. On the basis of these results, we have proposed a bilayer model to explain the enhancement in conductivity and its strong dependence on fibril diameter.

Descriptors :   *POLYMERS, *SYNTHESIS(CHEMISTRY), *TEMPLATES, *PYRROLES, *MOLECULAR STRUCTURE, POLARIZATION, INFRARED SPECTROSCOPY, MODELS, CONDUCTIVITY, LAYERS, GROWTH(GENERAL), THIN FILMS, ULTRAVIOLET SPECTROSCOPY, CHAINS, CHEMICAL REACTIONS, VISIBLE SPECTRA, MEMBRANES, ABSORPTION, INFRARED RADIATION, NEAR INFRARED RADIATION, POLYCARBONATES, POROUS MATERIALS, FOURIER SPECTROSCOPY.

Subject Categories : Polymer Chemistry
      Organic Chemistry
      Textiles
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE