Electrically Conducting Complexes of Poly (3,6-N-Methylcarbazolyl Methylene).
Abstract
Poly(3,6-N-methylcarbazolyl methylene) prepared by acid-catalyzed condensation polymerization of N-methylcarbazole with formaldehyde exhibits p-type semiconducting properties when doped with electron acceptors such as iodine, bromine, nitrosyl tetrafluoroborate, and nitrosyl hexafluoroantimonate. The polymer samples have Glass transition Temperature t sub g in the range 100-148 deg C, chain length in the range 13-25, and molecular weight distribution of 1.17-1.51. The polymer complexes with dopant anion (I-3, Br-3, BF-4) to polymer repeating unit ratio of 0.67-0.95 have d.c. conductivity of .001 to .1/ohm/.1 and a positive thermoelectric voltage at 23 deg C. An important new feature of the methyylene-bridged polycarbazole conducting polymers is doping-induced polymer backbone conjugation of the form -CH2- yields =CH-. Evidence for this oxidation mechanism, converting methylene linkages to methine linkages, includes elemental analysis, infrared spectra, proton NMR, and electron spin resonance results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 05, 1984
- Accession Number
- ADA147884
Entities
People
- S. A. Jenekhe
- S. T. Wellinghoff
- Zhi Deng
Organizations
- Honeywell International, Inc.