Chain-transfer-dependent termination in emulsion polymerization

The influence of chain transfer agent, tert‐dodecyl mercaptan, on the kinetics of semi‐batch seeded emulsion (co)polymerizations has been studied. Due to the very low water‐solubility of tert‐dodecyl mercaptan, the radical resulting after transfer to this chain transfer agent is not likely to exit t...

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Bibliographic Details
Published in:Macromolecular symposia. 2000-04, Vol.155 (1), p.53-62
Main Authors: Manders, Bart G., Morrison, Bradley R., Klostermann, Rainer
Format: Article
Language:English
Subjects:
Acrylates
Chain transfer
Chains (polymeric)
Emulsions
Mercaptans
Polymerization
Radicals
Termination (polymerization)
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Summary:The influence of chain transfer agent, tert‐dodecyl mercaptan, on the kinetics of semi‐batch seeded emulsion (co)polymerizations has been studied. Due to the very low water‐solubility of tert‐dodecyl mercaptan, the radical resulting after transfer to this chain transfer agent is not likely to exit the growing polymer particles and the kinetics should not be affected by this radical loss route. This has been confirmed experimentally for styrene‐butadiene and butyl acrylate systems. However, increasing the level of tert‐dodecyl mercaptan at large (final) particle sizes for styrene‐butadiene led to a reduced rate of polymerization. This only can be attributed to an increased rate of termination.
ISSN:1022-1360
1521-3900
DOI:10.1002/1521-3900(200004)155:1<53::AID-MASY53>3.0.CO;2-1