Using Nitroxide Decay to Study the Photooxidation Kinetics of Automotive Topcoat Enamels |
| |
| Authors: | J L Gerlock D R Bauer D F Mielewski |
| |
| Institution: |
a Research Staff, Ford Motor Company, Dearborn, MI, USA |
| |
| Abstract: | Free radical scavenging by nitroxide dopant is used to quantify the photoinitiation rate of free radicals in acrylic/melamine and polyesterlurethane 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. |
| |
| Keywords: | Nitroxide ESR acrylic/melamine polyester/urethane photooxidation rate photoinitiation rate weatherability |
| 本文献已被 InformaWorld 等数据库收录！ |
