A new scheme for determination of the carrier mobility and main-chain conformation of an electroactive polymer chain by transient electric birefringence

Iwao Teraoka, Reinosuke Hayakawa

Research output: Contribution to journalArticle

Abstract

A new scheme of experimental criterion is proposed for estimating the carrier mobility and main-chain conformation of an electroactive polymer chain by the technique of transient electric birefringence (TEB). The rise response Δnr(t) and the decay response Δnd(t) in the TEB satisfy in the Kerr regime (i) Δnr(t) = Δn st-Δnd(t) for a polymer molecule of arbitrary conformation with an induced dipole moment alone arising from carriers highly mobile along the main chain, (ii) Δnr(t) = Δn st-(3/2)Δnd(t/3) + (1/2)Δnd(t) for a rodlike polymer molecule with a permanent dipole moment alone originating from carriers with low mobility, and (iii) Δnr(t) = Δn st-2Δnd(t/2) + Δnd(t) for a random-coiled polymer with a permanent dipole moment alone due to low-mobility carriers, where Δnst = limt-∞ Δn r(t). Then, comparison of the TEB rise and decay responses gives us information on the carrier mobility and main-chain conformation. This criterion is valid also for polydispersed polymer samples. By applying the criterion to the exemplifying data of the TEB responses for soluble urethane-substituted polydiacetylenes, it is found that the polydiacetylene molecules take a random-coil conformation with a permanent dipole moment in a good solvent, while in a poor solvent the carrier mobility depends crucially on the solvent condition.

Original languageEnglish (US)
Pages (from-to)4920-4925
Number of pages6
JournalThe Journal of Chemical Physics
Volume91
Issue number8
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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