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Using nitroxide decay to study the photooxidation kinetics of automotive topcoat enamels
J L Gerlock1, D R Bauer, D F Mielewski
1Ford Motor Company, Dearborn, MI 48121.
Free Radical Research Communications
|January 1, 1990
Abstract:
Free radical scavenging by nitroxide dopant is used to quantify the photoinitiation rate of free radicals in acrylic/melamine and polyester/urethane coatings during photolysis under "near ambient" exposure conditions. Photoinitiation rate measurements on weathered coatings reveal that acrylic/melamine coatings photooxidize non-autocatalytically, while polyester/urethane coatings photooxidize autocatalytically. The decomposition of hydroperoxide photolysis products by melamine crosslinker is claimed to account for this difference in photooxidation kinetics.