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Transmission in irradiated hydroxyethyl methacrylate copolymer at elevated temperatures

Published online by Cambridge University Press:  31 January 2011

K-P. Lu ,
Sanboh Lee  and
C. C. Han
K-P. Lu
Affiliation:
Department of Materials Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
Sanboh Lee
Affiliation:
Department of Materials Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China
C. C. Han
Affiliation:
Polymer Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

Transmission losses were monitored in the ultraviolet-visible spectra of irradiated hydroxyethyl methacrylate (HEMA) copolymer at elevated temperatures. The transmission in irradiated HEMA in the ultraviolet and visible wave length range was almost the same for doses 400 kGy ≤ Φ ≤ 1000 kGy, but was smaller than that of the nonirradiated HEMA copolymer. The reduction in transmission in the irradiated specimens was attributed to the presence of color centers. The concentration of color centers was enhanced by thermal annealing. The transmission data (or absorption data) at 467 nm was found in good agreement with the theoretical model in which the color center production followed a first-order kinetic process. The rate constant satisfies the Arrhenius equation, and the corresponding activation energy is 17.37 kJ/mol and is independent of the dosage. The results were compared with those reported in the literature.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 9 , September 2002 , pp. 2260 - 2265
Copyright
Copyright © Materials Research Society 2002

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