In the present work we are concerned in the study, by means of the X-ray Photoelectron Spectroscopy (XPS), of the solar radiation impact (atmospheric environment), on the natural aging of the polypropylene (PP). The study has focused on two periods of aging, 60 and 80 days. Results of the quantitative analysis show an important degradation of the aged material due essentially to the contamination by oxygen, The latter being the main contaminating agent in surface. The solar radiation accelerates the oxidation of the surface of the PP by rupture of the C-H bonds. The decomposition of C1s and O1s peaks has allowed a best comprehension of the chemical reactional mechanisms, in terms of carbon-oxygen bonds (C=O, C-OH and O=C-O) responsible of the photo-oxidation.In the present work we are concerned in the study, by means of the X-ray Photoelectron Spectroscopy (XPS), of the solar radiation impact (atmospheric environment), on the natural aging of the polypropylene (PP). The study has focused on two periods of aging, 60 and 80 days. Results of the quantitative analysis show an important degradation of the aged material due essentially to the contamination by oxygen, The latter being the main contaminating agent in surface. The solar radiation accelerates the oxidation of the surface of the PP by rupture of the C-H bonds. The decomposition of C1s and O1s peaks has allowed a best comprehension of the chemical reactional mechanisms, in terms of carbon-oxygen bonds (C=O, C-OH and O=C-O) responsible of the photo-oxidation
