An empirically-based model has been created to predict the change in modulus for polymers exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by High Energy Radiant Exposure). The NIST SPHERE can independently precisely control each of the four primary components of the outdoor exposure: Temperature, Humidity, Ultraviolet Radiation and Mechanical Loading. The properties of the polymers were measured before and after each exposure period. The resulting empirically-based model produces two major results: the statistical significance of each of the weathering components and a prediction of property change for any location, provided a historical weather file is available. This model has shown that all four weathering factors, listed above, are significant contributors to change in properties of polymers. Additionally, the geographical predictions allow for independent verification of these models. 

Prediction of the changes in polymers due to outdoor weathering

248th National Meeting (2014)

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