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Investigation of the Chain Length Dependence of k p : New Results Obtained with Homogeneous and Heterogeneous Polymerization
Author(s) -
SchnöllBitai Irene,
Mader Christoph
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750204
Subject(s) - polystyrene , polymerization , inflection point , materials science , styrene , size exclusion chromatography , homogeneous , radical polymerization , molar mass distribution , chain (unit) , poisson distribution , polymer chemistry , analytical chemistry (journal) , chemistry , thermodynamics , copolymer , chromatography , mathematics , polymer , physics , organic chemistry , composite material , statistics , geometry , astronomy , enzyme
New experimental results were collected for the free radical polymerization of styrene by pulsed laser polymerization in solution or in microemulsion. The location of the point of inflection (on the low molecular weight side) and the maximum of the first peak in the chromatograms (measured by size‐exclusion chromatography) was used to extract k p data. The extent of band broadening was determined with narrow polystyrene standards with an assumed Poisson chain length distribution. For a given experiment both k p values (obtained via the point of inflection and the maximum) were corrected and thus became identical in most cases. Even after the correction, the effect of chain length dependence persists to a higher chain length.