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Most polymeric materials are subject to oxidation; the rate of oxidation depends on the polymer, fabrication methods, and end use conditions. Oxidation of polyolefins can result in discoloration and loss of physical properties such as elongation, impact strength, tensile strength and flexibility. Antioxidants and light stabilizers protect polyolefins against oxidation by controlling molecular weight change and the ensuing loss of physical and mechanical properties.
Careful evaluation of the long-term performance of polyolefins is critical to the successful development of new stabilization systems. While real-time outdoor exposure of materials is desirable, it is usually not practical due to the exposure times required. Consequently, several accelerated aging methods have been developed. This paper will discuss and compare commonly used accelerated test methods.
geosynthetic, aging, durability, oxidative induction time, long term heat aging
research and development chemist, CIBA-GEIGY Corporation, Ardsley, New York