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Photoinitiated polymerization of methyl methacrylate using Q-sized zinc oxide colloids

Hoffman, A. J. and Yee, H. and Mills, G. and Hoffmann, M. R. (1992) Photoinitiated polymerization of methyl methacrylate using Q-sized zinc oxide colloids. Journal of Physical Chemistry, 96 (13). pp. 5540-5546. ISSN 0022-3654. doi:10.1021/j100192a066.

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The polymerization of methyl methacrylate has been shown to occur readily using Q-sized ZnO semiconductors as photoinitiators. We have examined the effects of solvent, monomer concentration, initiator concentration, light intensity, and semiconductor particle size upon the reaction rates. The reaction pathway appears to be via anionic initiation, followed by free-radical propagation steps. The holes formed upon illumination are scavenged by the solvent. Increasing the concentration of the photoinitiator increased polymer yield until a saturation value was achieved. The rate of polymerization rapidly increased with increasing monomer concentration, due to the Trommsdorf effect. The rate of polymerization was found to depend upon the square root of the incident light intensity, as predicted from simple kinetic theory. Quantum yields of polymerization decreased as particle size decreased, due to either increased surface defects or enhanced rates of competing electron-hole recombination. Under the same experimental conditions, no polymerization occurred with bulk-size ZnO particles as photoinitiators; thus Q-sized ZnO particles were more efficient photoinitiators of polymerization.

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Hoffmann, M. R.0000-0001-6495-1946
Additional Information:© 1992 American Chemical Society. Received: November 20, 1991; In Final Form: March 10, 1992. Publication Date: June 1992. We are grateful to the du Pont Co., Photosystems and Electronic Products Department, for financial support, and we appreciate the assistance of Drs. Detlef Bahnemann and Berhan Tecle in the early stages of this research. Registry No. MMA, 80-62-6; PMMA, 9011-14-7.
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Issue or Number:13
Record Number:CaltechAUTHORS:20150811-111821156
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Official Citation:Photoinitiated polymerization of methyl methacrylate using Q-sized zinc oxide colloids A. J. Hoffman, H. Yee, G. Mills, and M. R. Hoffmann The Journal of Physical Chemistry 1992 96 (13), 5540-5546 DOI: 10.1021/j100192a066
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59407
Deposited By: Ruth Sustaita
Deposited On:11 Aug 2015 18:35
Last Modified:10 Nov 2021 22:20

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