STP1028

    End-Group Effects on the Wavelength Dependence of Laser-Induced Photodegradation in Bisphenol-A Polycarbonate

    Published: Jan 1988


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    Abstract

    This is an extended summary of a complete paper published recently in Macromolecules. The photochemistry of bisphenol-A polycarbonate (BPA-PC) has been the subject of a number of investigations since losses of desirable properties such as transparency, tensile strength, impact resistance, and rigidity result from photodegradation when this well-known engineering polymer is used in outdoor applications [1-3]. Since many of these properties are adversely influenced by reactions at the surface of the solid polymer, where solar UV absorption and uptake of oxygen and water are highest, the addition of UV stabilizers and/or antioxidants to the bulk polymer has been generally unsuccessful in extending its outdoor service life to beyond 3 years [4]. Attempts to extend the outdoor service life of polycarbonates by incorporating them into laminates of weatherable, UV-absorbing acrylate and methacrylate polymers have also been unsuccessful, although efforts in this direction continue [5].

    Keywords:

    Laser-induced photodegradation, bisphenol-A polycarbonate, polymer photodegradation, vibrational spectra, infrared reflection-absorption, phenolic end-groups, hydrogen-bonded carbonyl groups, polymer films, end-group effects, FT-IR, photo-Fries rearrangements, photochemistry


    Author Information:

    Webb, JD
    Solar Energy Research Institute, Golden, CO

    Czanderna, AW
    Solar Energy Research Institute, Golden, CO


    Paper ID: STP18556S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP18556S


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