ON THE ESR SINGLET SPECTRA FREQUENTLY OBSERVED IN IRRADIATED POLYMERS AT A LARGE DOSE
A large number of polymers were found to give singlet ESR spectra when highiy irradiated or heated after irradiation. Such polymers are polyethylene, polypropylene, polyvinyl chloride, rubber, polymethyl methacrylate, polyvinyl alcohol, and beta -oarotene. The singlet spectra are quite similar to each other with a DELTA H/sub msi/ value of approximately 17 gauss and are interpreted in terms of an unpaired electron in a conjugated double-bond system, - CH/sub 2/ -CH -( -CII= CH -)/sub n/ -CH/sub 2/-. If n = 0, the unpaired electron localizes on tbe central carbon and a sextet spectrum results; whereas for large n, a singlet spectrum may result. It is tentatively concluded that irradiation produces double bonds in carbon chain polymers and extends the conjugation region of the double bonds with dose to an 11 double-bond limit as in beta -carotene. (D.L.C.)
- Research Organization:
- Osaka Labs.
- NSA Number:
- NSA-15-012976
- OSTI ID:
- 4072865
- Journal Information:
- J. Polymer Sci., Journal Name: J. Polymer Sci. Vol. Vol: 47
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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