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Abstract
We studied the dielectric normal mode relaxation in dilute and semidilute solutions of poly(e-caprolactone) (PCL) and poly(δ-valerolactone) (PU) in benzene using narrow distribution samples prepared with an initiator of a lanthanoid complex. The effect of long nonpolar groups separating the polar ester groups on the dielectric behavior was investigated by comparing the present results with those for cis-polyisoprene (PI) solutions reported previously. In dilute solutions, the longest relaxation time r for both PCL and PU increased in proportion to M 1.63±0.03 . The double-logarithmic plots of r us [η]η s M/RT for the dilute solutions as well as those of PI fell on the same universal straight line irrespective of the solvent quality
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