Conducting Electronic Polymers by Non-Redox Processes
Abstract
In order to gain additional information concerning the nature of doped and undoped polyanilines, a collaborative 15N NMR study is underway with Professor S.J. Opella, Chemistry Department and Dr. Opella's postdoctoral associate, Dr. K.V. Ramanathan, (half of whose salary is paid by MacDiarmid's DARPA contract). 15N-enriched leucoemeraldine base (y=1)i.e. (-(C6H4)-n(H)- (C6H4)-N(H)-)x (compound I), emeraldine' base (Y approx. 0.5), (compound II); protonated emeraldine base, i.e. emeraldine.qHC1 and (Compound III) were synthesized. The solid state 15N NMR CP/MAS in natural 15N abundance of the model compound, -(C6H4)-N(H)-(C6H4)-NH2, exhibited signals at 70 ppm and 37 ppm (ammonium sulfate reference) characteristic of the -N(H)- and -NH2 groups respectively. The solid state spectrum of compound I exhibited only one peak (at 54 ppm) characteristic of the -N(H)- groups. It is, therefore consistent with the proposed structure of the polymer. For many years a major draw-back of conducting polymers was that they were not processible. However, we have now found that emeraldine base may be dissolved in 80% aqueous acetic acid or N- methypyrrolidinone (NMP) from which free-standing films of emeraldine acetate and emeraldine base may be cast. In the latter case, after appropriate treatment, free-standing, lustrous, coppery, flexible films of emeraldine base up to 12 cm x 12 cm may be obtained.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1987
- Accession Number
- ADA205551
Entities
People
- Alan G. Macdiarmid
Organizations
- University of Pennsylvania