Perylene-based profluorescent nitroxides for the rapid monitoring of polyester degradation upon weathering: An assessment
Paul D Sylvester, Helen E Ryan, Craig D Smith, Aaron S Micallef, Carl H Schiesser, Uta Wille
POLYMER DEGRADATION AND STABILITY | ELSEVIER SCI LTD | Published : 2013
A profluorescent nitroxide possessing an isoindoline nitroxide moiety linked to a perylene fluorophore was developed to monitor radical mediated degradation of melamine-formaldehyde crosslinked polyester coil coatings in an industry standard accelerated weathering tester. Trapping of polyester-derived radicals (most likely C-radicals) that are generated during polymer degradation leads to fluorescent closed-shell alkoxy amines, which was used to obtain time-dependent degradation profiles to assess the relative stability of different polyesters towards weathering. The nitroxide probe couples excellent thermal stability and satisfactory photostability with high sensitivity and enables detectio..View full abstract
This work was supported by the Australian Research Council and PPG Industries Australia Pty Ltd. We thank Professor Ken Ghiggino, Dr Philip Barker and Mena Param for helpful discussions.