Abstract
AbstractThe 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. © 1994 John Wiley & Sons, Inc.
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