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Characterization of Kinetic Mechanisms of Three-component Photoinitiator Systems for Visible-light Free Radical Polymerizations

Published online by Cambridge University Press:  01 February 2011

Dongkwan Kim  and
Jeffrey W Stansbury
Dongkwan Kim
Affiliation:
[email protected], University of Colorado at Denver and Health Sciences Center, Craniofacial Biology, 12800 East 19th Avenue, Aurora, CO, 80045, United States
Jeffrey W Stansbury
Affiliation:
[email protected], University of Colorado at Denver and Health Sciences Center, Craniofacial Biology, Aurora, CO, 80045, United States
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Abstract

Three-component photoinitiator systems generally include a light-absorbing photosensitizer (PS), an electron donor and an electron acceptor, which is usually an onium salt. To investigate the key factors involved with visible-light free radical polymerizations of three-component photoinitiators, we used thermodynamic feasibility and kinetic considerations with three-component photoinitiator systems containing either rose bengal (RB) or fluorescein (FL) as the photosensitizer. The Rhem-Weller equation was used to verify the thermodynamic feasibility for the photo-induced electron transfer reaction. Using the thermodynamic feasibility, we suggest three different kinetic mechanisms, which are i) photo-reducible series mechanism, ii) photo-oxidizable series mechanism and iii) parallel-series mechanism.

Keywords

polymerizationkineticsphotochemical
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1060: Symposium LL – Bioinspired Polymer Gels and Networks , 2007 , 1060-LL02-05
Copyright
Copyright © Materials Research Society 2008

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References

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