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Modeling of Diffusion Limitations in Bulk RAFT Polymerization

✍ Scribed by A. David Peklak; Alessandro Butté

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
297 KB
Volume
15
Category
Article
ISSN
1022-1344

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✦ Synopsis

Abstract

Summary: The impact of diffusion limitations on RAFT polymerizations is investigated in this work. In particular, two models are compared: one accounting for diffusion limitations by using average chain lengths, the other accounting for the entire CLD. It is shown that such a description is necessary to correctly predict the kinetics of polymerization processes, as well as the evolution of average chain length and polydispersity. For properly selected study cases, differing conversion curves are obtained above 40% monomer conversion, if only average values of the CLD are considered. The same is valid for the calculation of the polydispersity, which starts differing above 80% conversion. Finally, for given conditions of diffusion limitations, it is found that an ideal polydispersity can be defined and it is shown that the polydispersity tends to this characteristic value during the entire evolution of the polymerization process.

$k_{\rm t}^{{\rm CLD}} /k_{\rm t}^{{\rm DP}}$ as a function of f for various values of $\overline {DP} _n^{\rm R} /\overline {DP} _{{\rm crit}}$.

magnified image$k_{\rm t}^{{\rm CLD}} /k_{\rm t}^{{\rm DP}}$ as a function of f for various values of $\overline {DP} _n^{\rm R} /\overline {DP} _{{\rm crit}}$.

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