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Chemistry International
Vol. 23, No.3
May 2001

 

New Projects


Critically Evaluated Termination Rate Coefficients for Free-Radical Polymerization.1. Current Status, Evaluation of Experimental Methods, Data for Styrene and Methyl Methacrylate

Free-radical polymerization (FRP) has always been a scientifically and commercially important field. This importance is set to increase even further owing to recent advances such as the development of "controlled radical polymerization". Hence, it is of great benefit for both science and industry to be able to model the kinetics of FRP systems. Such modeling is dependent on the availability of reliable values of rate coefficients, but attaining such values is not as straightforward as one might suppose. An IUPAC Working Party on Modeling of Polymerization Kinetics and Processes has outlined the reasons for this situation [1,2] and has begun to rectify it with regard to propagation rate coefficients [3-5]. Now this process will be started for termination rate coefficients, k t .

This collaborative project, supported by IUPAC' s Macromolecular Division (IV), brings together experts in the field in order to fulfill the following goals:

  • To make workers aware of the subtleties involved in studying and describing the termination reaction;
  • To carry out an evaluation of methods for determining k t , arriving at agreement regarding the strengths and weaknesses of each method; and
  • To come up with critically evaluated k t values for the initial stages of bulk polymerization of styrene and methyl methacrylate, two otherwise well-characterized systems.

This project is being chaired by Dr. Greg Russell, who may be contacted at: Department of Chemistry, University of Canterbury, Private Bag 4800, Christchurch, New Zealand; Tel.: +64 3 364 2458; Fax: +64 3 364 2110; E-mail [email protected]. ac.nz. Comments and suggestions will be welcomed. See http://www.iupac.org/projects/2000/2000-028-1-400.html for project description and update.

1. M. Buback, L. H. Garcia-Rubio, R. G. Gilbert, D. H.Napper, J. Guillot, A. E. Hamielec, D. Hill, K. F.O' Driscoll, O. F. Olaj, J. Shen, D. Solomon, G. Moad, M. Stickler, M. Tirrell, M. A. Winnik. J. Polym. Sci.,Polym. Lett. Ed. 26, 293 (1988).

2. M. Buback, R. G. Gilbert, G. T. Russell, D. J. T. Hill, G. Moad, K. F. O' Driscoll, J. Shen, M. A. Winnik. J. Polym. Sci., Polym. Chem. Ed. 30, 851 (1992).

3. M. Buback, R. G. Gilbert, R. A. Hutchinson, B. Klumperman, F.-D. Kuchta, B. G. Manders, K. F. O' Driscoll, G. T. Russell, J. Schweer. Macromol. Chem. Phys. 196, 3267 (1995).

4. S. Beuermann, M. Buback, T. P. Davis, R. G. Gilbert, R. A. Hutchinson, O. F. Olaj, G. T. Russell, J. Schweer, A. M. van Herk. Macromol. Chem. Phys. 198, 1545 (1997).

5. S. Beuermann, M. Buback, T. P. Davis, R. G. Gilbert, R. A. Hutchinson, A. Kajiwara, B. Klumperman, G. T. Russell. Macromol. Chem. Phys. 201, 1355 (2000).

 

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