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We have developed 1D and 2D electron spin resonance imaging (ESRI) in order to deduce the spatial variation of radical properties in polymers exposed to UV radiation in the presence of oxygen, or thermally treated. The accelerated degradation of poly (acrylonitrile-butadiene-styrene) (ABS) containing Tinuvin 770 as the hindered amine stabilizer (HAS) was studied in a weathering chamber equipped with...
A flow cell was used for the monitoring of the state of copper ions in Cu-ZSM-5 in situ at high temperatures by e.s.r. Reduction of the most reactive square-planar coordinated Cu 2+ ions to Cu + occurs at 500°C in methane flow. The reoxidation of cuprous to cupric ions at 500°C by NO or O 2 is very fast; and, at 500°C, in mixtures of CH 4 with excess oxygen,...
A flow cell was designed for the monitoring of the state of copper ions in Cu-ZSM-5 in situ at high temperatures by e.s.r. In thoroughly purified He or in vacuum there is no spontaneous reduction of the cupric ions up to 500°C. The formation of adsorption complexes between isolated Cu 2+ cations and NO molecules at 20°C leads to a measurable change in coordination. Strong adsorption...
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