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Molecular weight distribution in a poly(vinyl chloride–vinyl acetate) copolymer
Author(s) -
Chen H. R.,
Blanchard L. P.
Publication year - 1972
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.1972.070160307
Subject(s) - osmometer , copolymer , gel permeation chromatography , molar mass distribution , vinyl chloride , tetrahydrofuran , polymer chemistry , vinyl acetate , fractionation , intrinsic viscosity , materials science , light scattering , dynamic light scattering , calibration curve , chemistry , chromatography , scattering , organic chemistry , polymer , solvent , physics , nanotechnology , optics , nanoparticle , detection limit
The molecular weight distribution of a vinyl chloride–vinyl acetate copolymer has been studied by three methods: (a) solution fractionation; (b) osmometry and light scattering; (c) gel permeation chromatography. In (a), the fractions were precipitated from a tetrahydrofuran solution by water, then characterized. The data yielded models for the intrinsic viscosity and the molecular weight distribution, in terms of the copolymer molecular weight. In (b), the unfractionated copolymer was characterized by osmometry and light scattering, using in the latter case the two currently accepted theories for the determination of the true weight‐average molecular weight. Conflicting data suggest caution in the use of these theories. In (c), the original fractions served to establish a calibration curve which yielded exceptionally low results when applied to the analysis of the unfractionated VC–VAc copolymer. Further investigations using proposed universal calibration theories bring to light serious discrepancies.