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Chromatographic fractionation of polyolefins
Author(s) -
Guillet J. E.,
Combs R. L.,
Slonaker D. F.,
Summers J. T.,
Coover H. W.
Publication year - 1962
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760020229
Subject(s) - polypropylene , materials science , fractionation , molar mass distribution , plot (graphics) , polymer , distribution (mathematics) , precipitation , thermodynamics , analytical chemistry (journal) , chromatography , statistics , mathematics , composite material , chemistry , mathematical analysis , physics , meteorology
Abstract The results compare favorably with those obtained by careful refractionation of fractions isolated by the precipitation method. A convenient parameter, U , related to the breadth of the molecular weight distribution can be calculated from the slope of the log‐probability plot. When the plot is linear, U , is numerically equal to the ratio M w / M n . Values of U obtained for a number of commercial and experimental polypropylenes indicate that, with a given type of polypropylene, the breadth of the distribution increases as the average molecular weight of the sample increases, and that wide differences in distribution can be expected from polymers made by different processes.