화학공학소재연구정보센터
Journal of Applied Polymer Science, Vol.53, No.12, 1599-1604, 1994
Dielectric Normal-Mode Relaxation of Entangled Cis-Polyisoprene Melts - Effects of Polydispersity
The effects of polydispersity on the dielectric normal-mode relaxation of entangled, cis-polyisoprene melts are considered. We use a linear mixing rule and reptation theory in conjunction with a theoretical molecular weight distribution (MWD) of variable breadth to predict loss spectra of model cis-polyisoprene melts. The half-widths of the predicted spectra show a nonlinear dependence on polydispersity index, with the greatest sensitivity near the monodisperse limit. The calculations are in agreement with literature data on narrowly dispersed samples.