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A novel parameter of polymer structure
Author(s) -
Bahary William S.
Publication year - 1966
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.1966.070100311
Subject(s) - osmometer , mooney viscosity , intrinsic viscosity , polybutadiene , viscosity , polymer , thermodynamics , molar mass distribution , copolymer , range (aeronautics) , chemistry , polymer science , materials science , polymer chemistry , chemical physics , organic chemistry , physics , composite material
A need exists for a simple and reliable heterogeneity index to determine the presence of high molecular weight components which may be branched in complex polymers and copolymers. On the basis of theoretical considerations, a proposal is made to employ the ratio of concentrated solution to intrinsic or Mooney viscosity as a heterogeneity index. The basis for the index is that the concentrated solution or melt viscosity is a function of a higher moment of the molecular weight distribution than either the intrinsic or Mooney viscosity. Experimental evidence in the form of light‐scattering measurements and osmometry support the validity of the index when the range of intrinsic viscosities is narrow and other assumptions cited are justified. It is further shown that the heterogeneity index correlates well with the processibility of cis ‐polybutadiene.