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Investigation of polymer‐based composites by laser desorption/ionization study of their photo‐oxidative aging
Author(s) -
Aubriet Frédéric
Publication year - 2020
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.8708
Subject(s) - fourier transform ion cyclotron resonance , chemistry , polymer , polybutadiene , desorption , mass spectrometry , degradation (telecommunications) , fourier transform infrared spectroscopy , photochemistry , chemical engineering , organic chemistry , adsorption , chromatography , copolymer , telecommunications , computer science , engineering
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 modify its properties, organic and/or inorganic compounds are generally added to PB. The aging of such composite materials is poorly known. Methods PB and its mixtures with TiO 2 and/or the Orange 13 pigment are subjected to an accelerated photo‐oxidative aging step for one week. The analysis of PB and its composites with regard to their composition and the aging time is carried out by 266 nm and/or 355 nm laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry (LDI‐FTICR‐MS). Results Both PB and its degradation products are detected by (+) LDI‐FTICR‐MS. The oxidation mechanism of PB is not significantly affected by the used organic or inorganic fillers, which results from the cleavage of the polymer chain and the formation of carbonyl compounds. The crosslinking of PB is significantly reduced by the two investigated fillers. Analysis in negative mode [(−) LDI‐FTICR‐MS] ensures the specific detection of the Orange 13 pigment. Conclusions LDI‐FTICR‐MS has demonstrated its ability to provide relevant information on the degradation of polymer‐based composites. The main advantages of this approach are its ability to probe the surface, which is specifically affected by photo‐oxidation aging processes, and to access the insoluble degradation compounds.