01945nas a2200217   4500008004100000022001400041245009800055210006900153260008000222300001000302490000700312520112900319653003701448653001401485653002201499653001801521100002601539700001801565700001901583856012501602       2011                        eng d  a1319-802500aGamma-initiated oxidation of isotactic polypropylene: effect of gamma-dose rate on durability0 aGammainitiated oxidation of isotactic polypropylene effect of ga  aTIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANYbSPRINGER HEIDELBERGcJAN  a29-380 v363 a<p>The effect of gamma-irradiation dose rate on the chemical, molecular, and mechanical properties of isotactic polypropylene (iPP) films was investigated using three different Co-60 sources with dose rates of 600, 660, and 780 Gy h(-1). Fourier transform infrared spectroscopy coupled with chemical derivatization with NO and SF4, and measurements of the elongation at break, toughness, and molecular weight were used to describe the effects of gamma-dose rate on iPP. It was found that the formation of oxidation products depended significantly on the dose rate. However, the kinetic accumulation of ketones were more sensitive to the dose rate of gamma source. Degradation induced by gamma-radiation depends on the dose rate-the degradation of mechanical properties was more significant at a low dose rate than at a high dose rate. It was found that the lower the dose rate, the higher the degree of oxidation in terms of the formation of gamma-products. The mechanism of gamma-degradation is discussed based on the correlation between the changes in chemical and physical properties upon exposure to gamma-radiation.</p>10aChemical and physical properties10aDose rate10agamma-irradiation10apolypropylene1 aAlariqi, Sameh, A. S.1 aSingh, R., P.1 aRao, B., S. M.  uhttps://library.ncl.res.in/content/gamma-initiated-oxidation-isotactic-polypropylene-effect-gamma-dose-rate-durability-0