Aging in CTBN modified epoxy resin stocks
The cause of degradation in the glass transition temperature (T/sub G/) of a partially crystallized polymer was investigated. Sample epoxy resin filled capacitors were cured at 90/sup 0/C for 24 hours, then stored at room atmospheric conditions. These showed typical degradation in T/sub G/ after storage for one month. One set of epoxy resin castings was stored at room atmosphere and another set was stored in a dry box at 0% relative humidity and 27/sup 0/C. The samples at room atmospheric conditions showed typical degradation in T/sub G/, while the T/sub G/ for those stored in the dry box increased. Further tests were then made on epoxy resin castings at various curing temperatures and times at both room atmosphere and 0% humidity. Resulting data indicated that absorption of moisture during storage was the predominant cause of T/sub G/ degradation, with stress relaxation another, though smaller, contributing factor.
- Research Organization:
- General Electric Co., St. Petersburg, FL (USA). Neutron Devices Dept.
- DOE Contract Number:
- EY-76-C-04-0656
- OSTI ID:
- 5795286
- Report Number(s):
- GEPP-TIS-437
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360401* -- Polymers & Plastics-- Preparation & Fabrication-- (-1987)
360404 -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
ABSORPTION
AGING
CAPACITORS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRICAL EQUIPMENT
EPOXIDES
EQUIPMENT
GLASS
MOISTURE
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
POLYMERS
RESINS
STORAGE
STRESS RELAXATION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE