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The NORDFORSK PVC polymer characterization project
Author(s) -
Sörvik Erling M.
Publication year - 1977
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.1977.070211016
Subject(s) - osmometer , viscometer , gel permeation chromatography , molar mass distribution , materials science , characterization (materials science) , polymer , analytical chemistry (journal) , chromatography , viscosity , polymer chemistry , chemistry , nanotechnology , composite material
Nordic research and industrial laboratories under the auspices of NORDFORSK performed a series of round‐robin tests on characterization methods for PVC. Ten samples of commercial‐type emulsion and suspension PVC were used. The resins covered a broad range of molecular weight. Gel permeation chromatography (GPC) was used to determine molecular weight distribution and molecular weight averages, M̄ n and M̄ w . These were also determined by osmometry and light scattering measurements, respectively. A good correlation was found for these three methods but GPC was by far the most versatile. Intrinsic viscosity was determined and viscometric routine analysis were investigated to evaluate the precision and informative value of such analysis. Solution viscometry according to the ISO or DIN standard proved to be quite adequate, being accurate, fast, versatile, and inexpensive, NMR spectroscopy was found to be much more accurate for quantitative tacticity determinations than infrared or Raman spectroscopy. For most characterization methods, remarkably good agreement between the laboratories was reached. The thorough investigations of the methods used resulted in detailed recommendations for viscometric, osmometric, and GPC determinations.