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Dielectric normal‐mode relaxation of entangled cis ‐polyisoprene melts: Effects of polydispersity
Author(s) -
Fodor Jeffrey S.,
Hill Davide A.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070531206
Subject(s) - dispersity , reptation , relaxation (psychology) , dielectric , spectral line , materials science , thermodynamics , polymer chemistry , chemistry , chemical physics , polymer , physics , quantum mechanics , psychology , social psychology , optoelectronics , composite material
Abstract 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. © 1994 John Wiley & Sons, Inc.