STP1202

    Quantitative Characterization of Photodegradation Effects of Polymeric Materials Exposed in Weathering Environments

    Published: Jan 1994


      Format Pages Price  
    PDF (376K) 25 $25   ADD TO CART
    Complete Source PDF (5.3M) 25 $69   ADD TO CART


    Abstract

    Both the experimental and mathematical analysis procedures used by the coatings and polymeric building materials communities for characterizing the photodegradation effects of UV radiation are different from those used by the medical, biological, and agricultural communities. In the building materials community, total ultraviolet radiation is monitored for characterizing the degradation effects of UV radiation. In these other disciplines, however, field and laboratory photodegradation data are related through total effective dosage, which is derived from the cumulative spectral UV irradiance to which a material is exposed along with the material's spectral absorption and guantum yield coefficients. Total effective dosage has been shown to be a good predictor of human response to solar UV radiation. The mathematical basis for determining the total effective dosage, the underlying assumptions, and supporting data and models are presented.

    Keywords:

    absorption, activation spectrum, aerosols, air mass, coatings, diffuse radiation, direct radiation, ozone absorption, photodegradation, quantum yield, Rayleigh, scattering, reciprocity law, solar spectral UV radiation, total effective dosage


    Author Information:

    Martin, JW
    Materials research engineer, National Institute of Standards and Technology, Gaithersburg, MD

    Lechner, JA
    Mathematical statistician and mathematician, National Institute of Standards and Technology, Gaithersburg, MD

    Varner, RN
    Mathematical statistician and mathematician, National Institute of Standards and Technology, Gaithersburg, MD


    Paper ID: STP18171S

    Committee/Subcommittee: G03.05

    DOI: 10.1520/STP18171S


    CrossRef ASTM International is a member of CrossRef.