Evolution of molecular weight distributions in the catalytic chain transfer polymerization of methyl methacrylate up to high monomer conversions

Kowollik, C. & Davis, T. P. (2000) Evolution of molecular weight distributions in the catalytic chain transfer polymerization of methyl methacrylate up to high monomer conversions. Journal of Polymer Science, Part A: Polymer Chemistry, 38(18).

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Abstract

The evolution of molecular weight distributions (MWDs) with monomer conversion in the catalytic chain transfer (CCT) polymerization of methyl methacrylate at 60°C is investigated by simulation (via the program package PREDICI) and experiment. A Co(III)-based complex is used as the precursor for the CCT agent, which is formed in situ by initiator-derived (2,2′-azobisisobutyronitrile) radicals to yield the catalytically active Co(II) species. The small shifts seen in the MWD toward lower molecular weights with increasing monomer conversion are shown to be of the same order of magnitude as the associated changes in the MWD in non-CCT controlled free-radical polymerization, indicating that no significant change in the MWD with monomer conversion is associated with the CCT process. These results are compared to the evolution of MWDs in conventional chain transfer polymerizations with thiols as transfer agents. A clear shift toward higher molecular weights is seen with increasing monomer conversion, indicating disparate rates of thiol and monomer consumption.

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ID Code: 99041
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :18
Export Date: 20 September 2016
CODEN: JPACE
Correspondence Address: Kowollik, Christopher; Univ of New South Wales
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Keywords: Catalysis, Cobalt compounds, Computer simulation, Initiators (chemical), Mathematical models, Molecular weight distribution, Monomers, Polymethyl methacrylates, Reaction kinetics, Synthesis (chemical), Catalytic chain transfer polymerization, High monomer conversions, Methyl methacrylate, Thiols, Free radical polymerization
DOI: 10.1002/1099-0518(20000915)38:18<3303::AID-POLA90>3.0.CO;2-5
ISSN: 0887624X
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 22 Sep 2016 04:50
Last Modified: 22 Sep 2016 04:50

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