Density profiling: a new technique for understanding oxidation effects in polymers. [Gamma radiation]
A density gradient column can be very useful for studying degradation processes occurring in polymers. Its capability for measuring the density of very small samples makes it ideal for investigating inhomogeneous degradation mechanisms such as diffusion-limited oxidation. This mechanism, which often plays an important role in the oxidative degradation of materials, can be induced by radiation, heat, light or other environmental stress. Studies on an ethylene propylene rubber (EPR) insulation, which was known to have radiation dose-rate effects over at least three orders of magnitude of dose rates (1 Mrad/h to 1 krad/h), showed that oxygen diffusion effects were important above approximately 100 krad/h. A second inhomogeneous mechanism, likely involving copper-catalyzed oxidation, was responsible for the continuation of the dose-rate effects below 100 krad/h. 4 figures.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6630904
- Report Number(s):
- SAND-82-2513C; CONF-830303-7; ON: DE83002556
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360405 -- Materials-- Polymers & Plastics-- Degradation & Erosion-- (-1987)
360406* -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
AGING
AMBIENT TEMPERATURE
CHEMICAL REACTIONS
DATA
DENSITY
DOSE RATES
ELASTOMERS
ELECTROMAGNETIC RADIATION
ETHYLENE PROPYLENE DIENE POLYMERS
EXPERIMENTAL DATA
GAMMA RADIATION
INFORMATION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDATION
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POLYMERS
RADIATION EFFECTS
RADIATIONS
RUBBERS