Abstract
An ESR method has been applied successfully to characterize the radicals called conformational defects in the polyphenylacetylene (PPA). The radical concentration was found to be increased by the thermal treatment of PPA sample. The maximum increase of spin concentration reached at 220°C. The ESR spectrum at 220°C was found to be symmetrical and show the hyperfine structure with g=2.0024, so that the spectral assignment was carried out. Based on this assignment it was concluded that the thermally stable conformer created by the heating was the trans -transoidal and the conformer was the most reasonable structure to stabilize the unpaired electron in the PPA conjugate system. It was also found that the decrease of the hyperfine coupling constants of the ESR spectrum observed were induced by the addition of iodine as an electron acceptor.
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