A novel method for the measurement of chain transfer to monomer constants in styrene homopolymerizations: The pulsed laser rotating reactor assembly

Kapfenstein-Doak, H., Barner-Kowollik, C., Davis, T. P., & Schweer, J. (2001) A novel method for the measurement of chain transfer to monomer constants in styrene homopolymerizations: The pulsed laser rotating reactor assembly. Macromolecules, 34(9).

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Abstract

The chain transfer to monomer constants (Cm) in styrene bulk polymerizations have been determined in the temperature range between 25 and 90 °C using both thermal polymerization and the novel pulsed laser polymerization (PLP) with extended dark times. This novel technique determines transfer to monomer rate coefficients by combining a pulsed laser setup with a rotating reactor/cuvette assembly. The resulting transfer controlled molecular weight distributions (MWD) were analyzed by the well-known Mayo and chain length distribution (CLD) methods. The results of both experimental methods agree well, which indicates that PLP with extended dark times is a reliable technique to determine transfer to monomer constants. For this reason, we report average values for the activation parameters determined from both thermal and extended dark times PLP experiments: Ea = 21.6 kJ mol-1 and A = 0.22 L mol-1 s-1. These numbers are in excellent agreement with those reported in the literature.

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ID Code: 99049
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :9
Export Date: 5 September 2016
CODEN: MAMOB
Correspondence Address: Davis, T.P.; Ctr. for Adv. Macromolecular Design, Sch. of Chem. Eng. and Indust. Chem., University of New South Wales, Sydney, NSW 2052, Australia
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Keywords: Chain length distribution (CLD), Pulsed laser polymerization (PLP), Activation energy, Chemical reactors, Homopolymerization, Laser pulses, Molecular weight distribution, Styrene
DOI: 10.1021/ma001871w
ISSN: 00249297
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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