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Towards the propagation rate coefficient for the free-radical polymerization of 1,3-butadiene

✍ Scribed by Friedhelm Bandermann; Claus Günther; Johannes Schweer

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
811 KB
Volume
197
Category
Article
ISSN
1022-1352

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✦ Synopsis

The propagation rate coefficient k, for the free-radical polymerization of 1,3-butadiene was determined as a function of temperature in the range of 30-60°C in bulk and as a function of the concentration of 1,3-butadiene in chlorobenzene at 50°C using a combination of a UV flash-lamp induced polymerization and a measurement of the molecular weight distribution of the produced polymer by size exclusion chromatography. Differences of up to around45Vo resulted even for the same concentrations and temperatures when these measurements were compared with recent determinations of k, of 1,3-butadiene in chlorobenzene in which just such an experimental setup was used. This finding was essentially attributed to large differences in the radical termination rates which prevailed in the reaction volumes under the current conditions of the pulse-induced polymerization experiments. Moreover, in the vicinity of bulk concentrations of 1,3-butadiene in chlorobenzene, k, apparently decreases with concentration. a) A short version of the present paper was presented at the "5th International Workshop

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