Critically evaluated termination rate coefficients for free-radical polymerization: Experimental methods

Barner-Kowollik, C., Buback, M., Egorov, M., Fukuda, T., Goto, A., Olaj, O. F., Russell, G. T., Vana, P., Yamada, B., & Zetterlund, P. B. (2005) Critically evaluated termination rate coefficients for free-radical polymerization: Experimental methods. Progress in Polymer Science (Oxford), 30(6).

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Abstract

The knowledge of accurate rate coefficients for individual steps of free-radical polymerization (FRP) is of scientific interest and of application-oriented importance. For a wide variety of homopolymerizations and for many copolymerizations, reliable propagation rate coefficients, k p, are accessible via the IUPAC-recommended method of PLP-SEC (pulsed laser polymerization - size-exclusion chromatography). For termination rate coefficients, kt, the situation is less favorable. Even for very common monomers, no kt benchmark data sets are available. Moreover, instead of having one recommended technique for measuring kt, there are a plethora of such methods. Seventeen of the most prominent approaches for measuring kt are here reviewed, including innovative ones that have emerged over the last decade. The methods have been subdivided into two categories: (i) 'Kinetic methods', in which analysis of the time dependence of concentrations is essential, and (ii) 'MWD methods', in which the analysis of the molecular weight distribution plays the dominant role. The methods are evaluated with respect to their potential for providing routine access to measuring kt as a function of monomer conversion and of free-radical chain length. Moreover, it has been considered whether expensive instrumentation or highly demanding analysis is required for a particular method and whether a method is applicable to many types of monomers. A table summarizes all these evaluations in a readily accessible form. The use of kinetic methods appears to be generally preferable over MWD-based methods. The largest potential is currently seen for methods in which polymerization is induced by a single laser pulse and where the subsequent time evolution of either monomer concentration or free-radical concentration is measured. © 2005 Elsevier Ltd. All rights reserved.

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ID Code: 99098
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By :94
Export Date: 5 September 2016
CODEN: PRPSB
Correspondence Address: Russell, G.T.; Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; email: greg.russell@canterbury.ac.nz
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Keywords: Free-radical polymerization, Kinetics, Molecular weight distributions, Pulsed-laser polymerization, Termination rate coefficients, Pulsed laser polymerization, Time-resolved quenching, Free radicals, Laser pulses, Molecular weight distribution, Monomers, Parameter estimation, Reaction kinetics, Size exclusion chromatography, Free radical polymerization
DOI: 10.1016/j.progpolymsci.2005.02.001
ISSN: 00796700
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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