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Hamzah M.,University Sidi Med Ben Abdallah | Rjeb A.,University Sidi Med Ben Abdallah | Houssaini D.S.,University Sidi Med Ben Abdallah | Sayouri S.,University Sidi Med Ben Abdallah | Massey S.,Laval University
Physical and Chemical News | Year: 2011

The effects of natural ageing on "agrofilm" of low density polyethylene stabilised (LDPE) are studied in this work. The principal component of this ageing is the photo-oxidation. The elucidation of the modifications of the surface, and the changes which take seat during four months of outdoor exposure were accomplished by the Attenuated Total Reflection Infrared spectroscopy (ATR-IR). The important chemical modification is resulting in products of photo-oxidation on the surface of the stabilised LDPE. Source


Hamzah M.,University Sidi Med Ben Abdallah | Rjeb A.,University Sidi Med Ben Abdallah | Sqalli Houssaini D.,University Sidi Med Ben Abdallah | Sayouri S.,University Sidi Med Ben Abdallah | Darhouri M.,University Sidi Med Ben Abdallah
Physical and Chemical News | Year: 2013

The aim of this paper is the study of the photo-oxidation degradation effect on two samples of the same Low Density Polyethylene (LPDE) polymer. One of these two samples was stabilized by 4% of the Hindered Amine Light Stabilizers (HALS), while the other one was taken as a reference. The samples were exposed during four months to weathering effects, and the ageing process examined by the Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) Spectroscopy. The main chemical modifications of the surface of the samples came from the formation of various kinds of vinyl and carbonyl groups identifiable in the ATR-FTIR spectra recorded on these degraded polyethylene samples. Carbonyl and vinyl groups arise from the well known Norrish II reactions. As shown in this study, the presence of the HALS can decrease the oxidation level of the materials and contributes to the retardation of the photo-oxidation process. Source

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