بررسي اثر تابش الكترون پرانرژي 10MeV بر تغيير ضريب رسانايي حرارتي آلياژ LDPE/EVA

Investigation on Effect of High-Energy Electron Beam (10 Mev) on Change of Conductive heat Coefficient of low-density polyethylene/ethylene-vinyl-acetate Blends

آلياژي از تركيب درصد وزني 90/10 ، 80/20، 70/30 ، اتيلن وينيل استات/ پلي اتيلن سبك، بصورت صفحات نازك به ضخامت 2mm تهيه شد. نمونه ها تحت تابش الكترون پرانرژي 10MeV در محدوده دز 250-0 kGy قرار داده شدند. سپس رسانايي حرارتي نمونه ها اندازه گيري گرديد. نتايج دلالت برافزايش رسانايي گرمايي پلي اتيلن بعد از مخلوط شدن اتيلن استات دارد. همچنين تأثير تابش الكترون به اين ترتيب بود كه ابتدا تا دز حدود 170kGy ضريب رسانش تمام نمونه ها كاهش و سپس با افزايش دز افزايش مي يابد

The low-density polyethylene (LDPE) and ethylene-vinyl-acetate (EVA) were blended together at ratios of 90/10, 80/20 and 70/30. Radiation effects on different amounts of (EVA) were discussed. Irradiation dose was selected in the range of 0-250 kGy. Then conductive heat coefficient of the samples was measured. It is found that in a definite temperature the conductive heat coefficient of low-density polyethylene/ethylene-vinyl-acetate blends increased with the increase in the ethylene-vinyl-acetate. Also it is found that conductive heat coefficient of the samples decreases to about 170 kGy and then increase with increase in the radiation dose.