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Journal of Applied Sciences
  Year: 2005 | Volume: 5 | Issue: 10 | Page No.: 1825-1829
DOI: 10.3923/jas.2005.1825.1829
 
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Changes in the Optical Band Gap and Absorption Edge of Gamma-Irradiated Polymer Blends

Elias Saion, Susilawati , A. Doyan , S. Zainal Abidin , Z. Azmi , A. Zulkfli , A R. Mohd Zaki , K.Z.H. Dahlan and T. Karni

Abstract:
The changes in the optical band gap and absorption edge of dyed poly(vinyl alcohol)-chloral hydrate (PVA-CH) polymer blends irradiated with gamma rays up to 12 k Gy have been investigated. The absorption spectra were measured in the wavelength range from 240 to 600 nm at room temperature. In the UV region, the absorption spectra increase with dose. The optical band gap (Eg) and the absorption edge decrease with increasing dose attributed to the structural disorder of the polymer blends due to dehydrochlorination of chloral hydrate with increasing dose. The energy width of the tail of localized states in the forbidden band gap was evaluated using the Urbach-edges method. It was found that the activation energy (ΔE) is less dependent on radiation dose but strongly dependent on concentration of the blend.
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How to cite this article:

Elias Saion, Susilawati , A. Doyan , S. Zainal Abidin , Z. Azmi , A. Zulkfli , A R. Mohd Zaki , K.Z.H. Dahlan and T. Karni , 2005. Changes in the Optical Band Gap and Absorption Edge of Gamma-Irradiated Polymer Blends. Journal of Applied Sciences, 5: 1825-1829.

DOI: 10.3923/jas.2005.1825.1829

URL: https://scialert.net/abstract/?doi=jas.2005.1825.1829

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