Macromolecules 1993,26, 5073-5083
5073
Slow Dielectric Relaxation of Entangled Linear cis-Polyisoprenes with Asymmetrically Inverted Dipoles. 1. Bulk Systems Hiroshi Watanabe,’ Osamu Urakawa, and Tadao Kotaka Department of Macromolecular Science, Faculty of Science, Osaka Uniuersity, Toyonaka, Osaka 560, Japan Received May 3,1993 ABSTRACT Global motion of entangled linear cis-polyisoprene (PI) chains in monodisperse systems was examined through their slow dielectric relaxation behavior. For this purpose, a series of dipole-inoerted PI chains of (almost) the same molecular weight M z 48 x 108 was made via multistep coupling of two living PI anion precursors of variousMI and M2 = M-M1(
