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Laser degradation of polymer coatings on reflective heat sinks
Author(s) -
Cozzens Robert F.,
Fox Robert B.,
Echols William H.
Publication year - 1979
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760191209
Subject(s) - materials science , volatilisation , polymer , coating , methyl methacrylate , laser , polystyrene , irradiation , degradation (telecommunications) , composite material , polymer chemistry , monomer , optics , organic chemistry , chemistry , physics , nuclear physics , telecommunications , computer science
The 10.6 μm laser‐induced degradation and volatilization of thin non‐char forming organic polymer coatings on aluminum heat sinks has been investigated. Volatilization rates were determined from coating absorptivities measured as a function of irradiation time at 110 W/cm 2 . First order volatilization rate constants (kJ −1 ) were: poly(ethylene‐co‐ethyl acrylate) 0.30, polystyrene 0.85, poly(ethyl methacrylate) 1.6, poly(methyl methacrylate) 2.1, and nitrocellulose 3.1. Residual coating thicknesses at infinite irradiation time are reported. Degradation results from exposure to the thermal environment provided by the heat sink as well as by the direct absorption of laser radiation. Relative polymer thermal stabilities measured at this laser irradiance level and by conventional heating methods are in agreement.