Modification of the optical band gap of polyethylene by irradiation with electrons and gamma rays

被引：26
作者：
Abdul-Kader, A. M. [1 ]
机构：
[1] Helwan Univ, Fac Sci, Dept Phys, Cairo, Egypt
来源：
PHILOSOPHICAL MAGAZINE LETTERS | 2009年 / 89卷 / 03期
关键词：
polyethylene; irradiation; optical energy gap; carbon cluster; polymers; MOLECULAR-WEIGHT POLYETHYLENE; ION; RADIATION; POLYMERS; UHMWPE; OXIDATION; HYDROGEN; SURFACE;
D O I：
10.1080/09500830902720891
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Irradiation of polymers has become an important technique in producing special materials for electronic applications. In this study, the effects of electron and gamma irradiation on ultra-high-molecular-weight polyethylene (UHMWPE) samples have been studied using UV-Vis absorption spectroscopy. The UHMWPE samples were irradiated with electron and gamma rays with doses ranging from 25 kGy up to 500 kGy. An increase in the optical absorption and a shifting from the UV-Vis towards longer wavelengths were observed. Concomitantly, a pronounced decrease in the optical band gap was recorded as a function of dose level. The optical band gap Eg varied from 2.86 eV for a pristine sample down to 1.98 eV and 2 eV for samples irradiated with gamma rays and electrons at the highest doses, respectively. A correlation between Eg and the number of carbon atoms N in a formed cluster is discussed in terms of a modified Tauc equation.
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收藏
页码：162 / 169
页数：8
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