Study of the effect of gamma irradiation on the structure and properties of metallocene linear low density
polyethylene containing hindered amines |
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Authors: | Mustapha Kaci Hocine Djidjelli Tahar Boukedami |
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Affiliation: | (1) Organic Materials Laboratory, Chemical Engineering Department, University A. Mira, 06000 Bejaia, Algeria |
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Abstract: | The changes in the carbonyl index, the melt flow rate, the crystalline content and the ultimate tensile
properties of metallocene linear low density polyethylene (mLLDPE) films subjected to gamma irradiation
from 10 to 800 kGy, were investigated with and without hindered amine stabilizer (HAS). For comparative
purposes, unstabilized and HAS stabilized low density polyethylene (LDPE) were also studied. The results
indicated that under gamma irradiation, the HAS stabilizer did not have any influence on the oxidative stability
of mLLDPE films as compared with unstabilized ones due probably to complexation reactions between the nitroxyl
radicals of the stabilizer and the metallocene catalysts leading to inert species. Moreover, higher increases
in melt flow index and crystalline content with a fast drop in ultimate tensile properties were observed
for higher doses indicating the occurrence of chain scission. It was also found that the metallocene LLDPE
structure had no significant effect on the radiation induced oxidative degradation kinetics when compared
to LDPE. Whereas, the addition of HAS to LDPE significantly lowered the formation rates of carbonyls and
subsequently improved the durability of the material by doubling the half-value-dose. |
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