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Determination and correction of peak broadening in size exclusion chromatography of controlled rheology polypropylene

✍ Scribed by K. Lederer; I. Beytollahi-Amtmann; J. Billiani

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
493 KB
Volume
54
Category
Article
ISSN
0021-8995

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✦ Synopsis

The peak broadening in size exclusion chromatography of seven commercial polystyrene (PS) standards with narrow molar mass distribution (MMD) and of 6-9 polypropylene (PP) fractions ( MW/M,, = 1.34-2.10) obtained by direct extraction was determined in four different column sets. The dependence of the Gaussian peak broadening parameter, 02, on the peak elution volume was different for PS and PP. For a commercial grade of controlled rheology PP ( C R -P P ) (Daplen PT55) with M w / M , , < 3 it was shown that disregard of the peak broadening effect leads to considerable errors in the MMD at low and high molar mass and in the polydispersity parameter Mw/M,,. The same lot was studied in a n Austrian National Research program for its physical properties in processing and application and in a round-robin test of IUPAC working party IV.2.2. on molecular characterization of commercial polymers. 0 1994 John Wiley & Sons, Inc.

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