Abstract
ESR and ENDOR measurements were performed on undoped poly (p-phenylene vinylene) films obtained by stretching the precursor films under inert gas atmosphere at temperatures between 100°C and 400°C. Weak ESR signals of the spin concentration being roughly 1 spin / 10 6 C 8H 6 unit appeared as the temperature of preparation increased. g value was about 2.003. Spectra showed a clear anisotropy both in g value and line width, where both quantities are larger for the stretch direction. Proton ENDOR signals were also detected and showed larger coupling values for the stretch direction. Observed anisotropy of ESR and ENDOR is qualitatively similar as those observed in stretch oriented polyacetylene, suggesting that the unpaired electrons are π-electron defects on the conjugated molecular chain.
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