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Home  >  Journal list  >  Polymer Journal  >  Vol.38  No.10 (2006)  >  pp.1081-1088

Polymer Journal
<<Previous article Vol.38  No.10 (2006)   pp.1081 - 1088 Next article>>

Dielectric Normal Mode Relaxation of Poly(propylene oxide) and Poly(butylene oxide) in Dilute and Semidilute Solutions

Hiroshi Nishimura1), Osamu Urakawa1) and Keiichiro Adachi1)
1) Department of Macromolecular Science, Graduate School of Science, Osaka University

ABSTRACT:  We investigated the dielectric normal mode relaxation in dilute and semidilute solutions of poly(propylene oxide)(PPO) and poly(butylene oxide)(PBO) in benzene which is a good solvent for PPO but a marginal solvent for PBO. The results indicate that the normal mode relaxation times τn in dilute solutions of PPO and PBO are proportional to [η]M in agreement with the Rouse-Zimm theory where [η] and M denotes the intrinsic viscosity and the molecular weight, respectively. With increasing concentration C, τn increases in proportion to C[η]. The dynamic crossover concentration between the dilute and semidilute regimes is about four times higher than the static crossover concentration C*. The relaxation strength Δε divided by C decreases with increasing concentration indicating that the mean square end-to-end distance <r2> decreases on account of the screening of the excluded volume effect. The concentration dependence of <r2> agrees approximately with the scaling theory.

Dielectric Normal Mode Relaxation/ Dilute Solution/ Semidilute Solution/ Poly(propylene oxide)/ Poly(butylene oxide)/ End-to-end Distance

Published online: October 14, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan

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