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Free-radical multicomponent polymerization reactors and chemical composition distribution

✍ Scribed by Engelmann, Uwe ;Schmidt-Naake, Gudrun

Publisher
Wiley (John Wiley & Sons)
Year
1993
Weight
758 KB
Volume
2
Category
Article
ISSN
1018-5054

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✦ Synopsis

Abstract

Formulae to calculate the statistically caused instantaneous copolymer composition distribution as well as the chemical distribution of accumulated macromolecules, which is due to polymerization statistics and shifts in mean polymer composition during the reaction process, are derived on the basis of a universal model for free‐radical solution polymerization with any number of monomers proceeding in a batch, semi‐batch or continuous, ideally mixed vessel. The influence of the reactor type on chemical composition distributions is investigated for a copolymerization of different reactive components (methyl methacrylate/styrene/maleic anhydride), a system with nearly equal reactive monomers (methyl methacrylate/styrene), and the ternary polymerization of methyl methacrylate/styrene/maleic anhydride. Though products of constant mean composition are obtainable in a semi‐batch or steady‐state continuous reactors, considerable statistical dispersion cannot be removed in any case.

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