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.
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Nishimura, H., Urakawa, O. & Adachi, K. Dielectric Normal Mode Relaxation of Poly(propylene oxide) and Poly(butylene oxide) in Dilute and Semidilute Solutions. Polym J 38, 1081–1088 (2006). https://doi.org/10.1295/polymj.PJ2006063
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DOI: https://doi.org/10.1295/polymj.PJ2006063