Oxygen ageing

AGE (advanced glycation end-product) caramel-like material formed by the reaction of a protein with glucose and oxygen. age-1 gene that when mutated extends the lifespan of nematode worms, allele one of (usually) several variants of the same gene. 

Oxygen Aging of Vulcanizates. Examination of Table II (NBR) and Table III (NR) demonstrates clearly that vulcanizates treated with the sulfonyl azide antioxidants retain physical properties to a marked degree after solvent extraction, followed by aging in oxygen. The conventional antioxidants used for comparison, such as PBNA in the NR or Irganox 1076 in the NBR, are removed by the extraction process and therefore afford no protection, resulting in samples too brittle to test. 

When comparing different polyacetylene films, one finds that the rate of relative decrease of the conductivity during the oxygen treatment varies by up to a factor of 10 from sample to sample, a fact that could be due to differences in sample morphology, which could lead to a different rate of diffusion of the oxygen into the interior of the sample or of the fibrils on the other hand, a difference in the concentration of reactive sites within the sample (e.g. chemical defects) could also explain this effect. No correlation has been observed between the absolute value of the room temperature conductivity and the rate of oxygen aging. 

If one tries to fit equ. 7 to the experimental temperature range between 0.4 K and 300 K as for freshly-prepared samples, but only between a temperature T qc where T qc loc/ decreases much... 

Oxidation by Oxygen ("Aging") a) Preparation After Oxidation... 

On the other hand, it is difficult to explain the behaviour of A(T) after oxygen aging. While optical experiments /23/ indicate that oxygen treatment results in a reduction of the conjugation length, SEM investigations during the... 

The conductivity anisotropy A of highly stretched samples doped to a maximum with iodine is largely temperature independent for freshly-prepared samples and has values between 20 and 30 for highly conducting samples. After oxygen aging, an increase of A towards lower temperatures is observed. 

EFFECT OF TMTD ON HEAT AND OXYGEN AGEING OF CLAY-FILLED NR COMPOUND... 

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