Abstract
In this paper, low-density polyethylene (LDPE) was irradiated by argon ion with different fluences up to 1015 ions/cm2. The optical, chemical and mechanical properties have been investigated using UV-Vis spectroscopy, FTIR and Micro-indentation tester, respectively. The results showed the ion beam bombardment induced decreases in the transmittance of the irradiated polymer samples. This change in transmittance can be attributed to formation of conjugated bonds i.e. possible formation of defects and/or carbon clusters. The indirect optical band gap decreased from 3.0 eV for pristine sample to 2.3 eV for that sample irradiated with the highest fluence of Ar ion beam. Furthermore, the number of carbon atoms and clusters increased with increasing the Ar ion fluences. FTIR spectra showed changes in the chemical properties of the bombarded polymer samples. Argon ion beam inducing increasing in the Vicker's micro-indentation, which may be attributed to the increase in the carbon concentration on the irradiated surface samples and cross-linking effects in the irradiated polyethylene chains.
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