title: Using nitroxide decay to study the photooxidation kinetics of automotive topcoat enamels.
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.
authors.affiliation: Ford Motor Company, Dearborn, MI 48121.
authors.forename: J L
authors.initials: JL
authors.lastname: Gerlock
authors.forename: D R
authors.initials: DR
authors.lastname: Bauer
authors.forename: D F
authors.initials: DF
authors.lastname: Mielewski
mesh_terms: D001336:Automobiles; D055598:Chemical Phenomena; D002621:Chemistry; D005609:Free Radicals; D009569:Nitric Oxide; D010084:Oxidation-Reduction; D010150:Paint; D010777:Photochemistry; D011108:Polymers / Q000032:analysis*
chemical_list: D005609:Free Radicals; D011108:Polymers; D009569:Nitric Oxide