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Effect of Buffer on the Optical Properties of Irradiated Hydroxyethyl Methacrylate Copolymer

Published online by Cambridge University Press:  31 January 2011

K. F. Chou ,
C. C. Han  and
Sanboh Lee
K. F. Chou
Affiliation:
Department of Materials Science, National Tsing Hua University, Hsinchu, Taiwan 30043, Republic of China
C. C. Han
Affiliation:
Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Sanboh Lee
Affiliation:
Department of Materials Science, National Tsing Hua University, Hsinchu, Taiwan 30043, Republic of China
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Extract

The effect of buffer and γ irradiation on the optical properties of hydroxyethyl methacrylate (HEMA) copolymer was investigated. The transmission of HEMA copolymer decreased with the increase of irradiation dose and/or pH value of the buffer. The cutoff wavelength of HEMA copolymer exhibits a bathochromic shift as the γ-ray dose and/or pH value of buffer increases. The influence of atmosphere during γ-ray irradiation on the optical properties of HEMA copolymer was investigated. The change of optical properties of HEMA copolymer irradiated in air was more pronounced than that irradiated in vacuum. Light was scattered by holes in the polymer. The relationship between scattering intensity (Is) and incident wavelength (λ) can be described by the formula Is ∝ λ−n. The span of holes increases with the irradiation dose regardless of radiation atmosphere and pH value in the range of 4.1–6.5. A boundary between the inner and outer layers of HEMA copolymer irradiated in air was observed, separating two differential morphologies of holes.

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Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1199 - 1207
Copyright
Copyright © Materials Research Society 2002

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