Investigation of polymer-based composites by laser desorption/ionization study of their photo-oxidative aging.

摘要: Rationale Polybutadiene (PB) is one of the most widely used polymers. Its aging occurs by reaction with oxygen under illumination and may modify its mechanical and/or aesthetic properties. To properties, organic inorganic compounds are generally added to PB. The such composite materials poorly known. Methods PB mixtures TiO2 Orange 13 pigment subjected an accelerated photo-oxidative step for week. analysis composites regard their composition time carried out 266 nm 355 laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry (LDI-FTICR-MS). Results Both degradation products detected (+) LDI-FTICR-MS. oxidation mechanism not significantly affected or fillers, which results from cleavage polymer chain formation carbonyl compounds. crosslinking reduced two investigated fillers. Analysis in negative mode [(-) LDI-FTICR-MS] ensures specific detection pigment. Conclusions LDI-FTICR-MS has demonstrated ability provide relevant information on polymer-based composites. main advantages this approach probe surface, specifically photo-oxidation processes, access insoluble