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SM ISO690:2012 КУЛИЕВ, М., ИСМАЙИЛОВА, Р., БАЙРАМОВ, M.. Исследование полимерных композиций методами термоактивационной спектроскопии. In: Электронная обработка материалов, 2008, nr. 6(44), pp. 52-55. ISSN 0013-5739. |
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Электронная обработка материалов | ||||||
Numărul 6(44) / 2008 / ISSN 0013-5739 /ISSNe 2345-1718 | ||||||
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Pag. 52-55 | ||||||
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In present work the features of the dependence of radiothermoluminescense (RTL), charge stabilization, change of the temperature of structural γ-, α- and β- transition on the degree of filling of low density polyethylene (LDPE) by the RTL and thermo stimulated current (TSC) methods are investigated. The RTL curve for LDPE γ - irradiated at 77 K consist three peaks at 130, 173 and 228 K (γ-, α- and β-relaxation).The low temperature peaks (γ- and α-peaks ) of RTL for LDPE results from recombination of trapped electrons with radiolysis product (i.e.radicals) and β- peak with a luminescence centre after tunneling through a potential barrier. After modification of LDPE by introduction of SA (special additive) up to 2 wt% the RTL γ- and α-peaks shifts to lower temperatures, while the β-peak shifts to higher temperatures. TSC spectra for LDPE show two peaks (negative peak at 303 K and positive peak at 418 K) which decreases in intensity and moves toward higher temperatures as the filling degree increases. The peak qt 418 K is due to the release of trapped charges from the crystalline regions on melting. |
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