Add time:08/12/2019         Source:sciencedirect.com

Electron migration along polymer chain is shown by the pulse radiolysis study of poly(4-vinylbiphenyl-co-1-vinylpyrene) in 2-methyltetrahydrofuran solution. For the copolymer with small vinylpyrene contents (0.34–1.58%), excess electron is initially localized in a biphenylyl side-group to form anion radical, and then transfers to a pyrenyl side-group. The electron transfer is enhanced with the increase in the vinylpyrene content in the copolymer, whereas it is independent of the copolymer concentration in the solution. These results indicate that the electron migrates along the copolymer chain by hopping between neighboring biphenylyl side-groups until it is stably trapped on a pyrenyl side-group. Frequency of the electron hopping is estimated to be 5.2 x 109 s-1.Positive charge migration is suggested to occur similarly by the pulse radiolysis of the copolymer in 1,2-dichloroethane solution. It is about one-tenth slower than the electron migration.

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