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Polymer reactors and molecular weight distribution. VIII. A method of interpreting skewed GPC chromatograms
Author(s) -
Balke S. T.,
Hamielec A. E.
Publication year - 1969
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.1969.070130705
Subject(s) - calibration , dispersion (optics) , range (aeronautics) , polymer , calibration curve , materials science , modal , flow (mathematics) , nonlinear system , polynomial , analytical chemistry (journal) , chromatography , mathematics , mechanics , physics , chemistry , optics , polymer chemistry , mathematical analysis , statistics , composite material , quantum mechanics , detection limit
Abstract A new‐method of interpreting GPC chromatograms which accounts for skewing and symmetrical axial dispersion has been developed. General relationships for a symmetrical axial dispersion correction and for a skewing correction are derived. The method has been verified experimentally for unimodal chromatograms and linear calibration curves over a wide range of GPC operating conditions, polymer molecular weights and polydispersities. Measurements of h and skewing factors were obtained by a once‐through technique. The need for performing reverse flow experiments has been eliminated. Artificial oscillations in the corrected chromatogram due to step size (Method of Pierce‐Armonas), and to number of terms in a polynomial expansion (Method of Tung and Method of Smith) are eliminated. The method has yet to be evaluated for nonlinear calibration curves and multi‐modal distributions. However, suggestions for its application in these circumstances are presented.