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Nov 14, 2018 - Aug 23, 2013 - Gardella 1988). Exposure to ultraviolet, UV, radiation may cause the. significant degradation of many materials. Damage by. UV radiation is comm Oct 3, 2014 -Nov 8, 2019 - Keywords: polypropylene, lanthanide complexes, UV irradiation, photodegradation. 1. Introduction. The commercial importance of polymers has lead to very. University, El-Giza, Egypt. Keywords. Photostabilizers; Polymers; Thermooxidation;. Degradation; UV radiation. Introduction. The photodegradation of polymers This theory is satisfactory for many polymers, but does not explain the instability of some polymers which are transparent to ultraviolet, nor the stability of some. Photodegradation takes place when UV or vis radiation breaks down the chemical bonds in a polymer, ultimately causing cracking, chalking, color changes and It is therefore important to know the properties of plastics in various degradation environments. In this case we are talking about aging plastics [4]. Polymer aging is It is therefore important to know the properties of plastics in various degradation environments. In this case we are talking about aging plastics [4]. Polymer aging is