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Factors of polymer weathering
The aging of natural and artificial polymeric materials is a natural phenomenon in metals, glass, minerals and other inorganic materials. The main environmental parameters influencing the degradation of polymeric materials is daylight combined with the effects of temperature, moisture and oxygen. These act as the main parameters of stress for outdoor weathering.
== Introduction ==
The components of the weather cycles responsible for the deterioration of most materials are non-ionizing radiation, atmospheric temperature and moisture in its various forms. This, combined with the effects of wind and atmospheric gases and pollutants.〔Seymour, RB in: Dostal, C. (Ed.), Engineered Materials Handbook, Vol. 2: Engineering Plastics, ASTM International, Materials Park, 1988, 423–432〕 Although the ultraviolet (UV) portion of solar radiation is mainly responsible for initiating weathering effects, the visible and near-infrared portions can also contribute to the weathering processes. Colored materials are susceptible to visible radiation, and near-infrared radiation can accelerate chemical reactions by raising the material temperature. The other factors act synergistically with solar radiation to significantly influence the weathering processes. All weather factors, including the quality and quantity of sunlight, vary with geographic location, time of day and year, and climatalogical conditions. In order to fully understand and predict the effect of weather on materials, data is required on each factor that may contribute to degradation.
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