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International Journal of Photoenergy
Volume 4 (2002), Issue 4, Pages 153-160

Gelation in free-radical crosslinking copolymerization; fast transient fluorescence study

Istanbul Technical University, Department of Physics, Maslak, Istanbul 80626, Turkey

Copyright © 2002 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The fast transient fluorescence (FTRF) technique was used to study the sol-gel phase transition in free-radical crosslinking copolymerization (FCC) in two different monomeric systems. Pyrene (Py) was used as a fluorescence probe for the in situ polymerization experiments. The fluorescence lifetimes of Py from its decay traces were measured and used to monitor the gelation process. Monomer consumption profiles were determined during gelation process using Stern-Volmer model. Gelations were performed at various temperatures and in various crosslinker contents. Composite rate constants, kr were determined and gelation activation energies, ΔEG were measured.