Recent theories have related the molecular-weight dependence of the conductivity of a conjugated polymer to the relative importance of interchain and intrachain charge transport processes. This prompted an experimental search for this effect using a series of fractionated poly(3-octylthiophenes). No significant molecular-weight dependence was found over the range 30 000 ~< Mw ~< 400 000, indicating that interchain transport does not limit the macroscopic conductivity of these samples. However, even small differences in the degree of crystallinity among the polymer samples were determined to have a profound effect on the conductivity.
Посилання на статтю:
The effect of molecular weight and crystallinity on the conductivity of a conducting polymer / G. W. Heffner, S. J. Dahman and D. S. Pearson // Polymer. – 1993. – Vol 34. – P. 3155-3159.