论文部分内容阅读
1.INTRODUCTION.Cis-polyisoprene (PI) has the type-A dipole parallel along the chain backbone so that its slow dielectric relaxation detects the orientational memory of the end-to-end vector (for linear PI) and/or end-to-branching point vector (for star PI).In contrast,for both linear and star PI,slow viscoelastic relaxation detects decay of isochronal orientational anisotropy of the entanglement segments.Thus,comparison of dielectric and viscoelastic data can reveal some detailed aspects of entanglement dynamics.