Abstract
During ignition testing of several polymeric materials, it was found that the surface reflectance/absorptance characteristics had a definite influence on the time of ignition. Since several of the polymers were either transparent or translucent, the monochromatic surface reflectance/absorptance had to be adjusted to account for energy transmittance. As a result, reflectance and transmittance measurements were made over the monochromatic wavelengths of 0.3-10.0 microns. Average values of reflectivity and transmissivity were calculated by the equation: \[{{(f)}_{av}}=\frac{\int {{f}_{\lambda }}{{e}_{\lambda }}d\lambda }{\int {{e}_{\lambda }}d\lambda !}\] where (f)av is either the average reflectivity, ray, or average transmissivity Tay, where fx is either the monochromatic reflectance rX or the monochromatic transmittance TX. A is the wavelength and a is the monochro-matic emissive power of the heat sourcA. Average values of reflectivity and transmissivity were calculated for several heat sources; radiant panel, carbon arcs (2900°K, 3900°, and 6000°K), solar radiation, benzene flame, and blackbody radiation. Plots of average reflectivity and transmissivity are illustrated, and charts of transmittance vs. wave length, and reflectance vs. wave length are included.
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© 1983 Plenum Press, New York
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Hallman, J.R., Sliepcevich, C.M., Welker, J.R. (1983). Interactions Between Several Radiation Sources and Certain Polymer Surfaces; Reflectance — Transmittance Characteristics. In: Mittal, K.L. (eds) Physicochemical Aspects of Polymer Surfaces. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7584-9_19
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DOI: https://doi.org/10.1007/978-1-4615-7584-9_19
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