Title Ultravioletinės spinduliuotės poveikis mažo tankio polietileno fizikocheminėms savybėms /
Translation of Title Effect of ultraviolet radiation on physicochemical properties of low-density polyethylene.
Authors Kemerytė, Simona ; Sitonytė, Jūratė ; Kazanavičius, Kazys
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Is Part of Jaunųjų mokslininkų darbai.. Šiauliai : Šiaulių universiteto leidykla. 2011, Nr. 3, p.155-161.. ISSN 1648-8776
Keywords [eng] low-density polyethylene ; ultraviolet radiation ; photo-oxidation ; photo-degradation ; infrared spectra
Abstract [eng] Ultraviolet radiation affects most polymers, including polyethylene. The effect of ultraviolet radiation (λ=360 nm and λ=254 nm) on the low-density polyethylene was analysed in this study. Infrared absorption spectra measurements by FTIR spectrometer were made in order to determine the change in chemical composition of the material, and changes in physical and mechanical properties were determined by measuring the electric capacity, inductance and mobility by using the instruments in a laboratory. It has been found that when the film is irradiated by 254 nm wavelength rays it oxidizes and this leads to appearance of carbonyl (C=O) groups, the amount of which increases in proportion to the duration of irradiation. The relative dielectric constant of the polyethylene film, estimated by measuring of the electric capacity, correlates with the level of oxidation. The measurements of the inductance have shown that with increase in duration of irradiation, the relative magnetic permittivity of the polyethylene film increases as a second degree function. The mobility of polyethylene decreases slightly when the samples are irradiated for no more than 216 hours. Lengthening of the duration of irradiation decreases the mobility sharply, the film becomes friable, its thickness declines, possibly as a result of photo- degradation. 360 nm wavelength radiation has no effect on physical and chemical characteristics of polyethylene.
Published Šiauliai : Šiaulių universiteto leidykla
Type Journal article
Language Lithuanian
Publication date 2011