PREDICTION OF MECHANICAL BEHAVIOR OF PLASTICS UNDERGOING DECOMPOSITION FROM THE COMBINED EFFECTS OF ENVIRONMENTAL EXPOSURE AND STRESS.
ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA
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A study was made to determine if the behavior of plastics undergoing breakdown from the effects of stress, elevated temperatures, and chemical attack could be predicted by means of a mechanical-chemical equation of state. Five systems were studied, the first four of which were tested for retention of strength at room temperature after environmental exposure a Glass-reinforced polyester laminate exposed to an alkaline medium at elevated temperatures b cellulose laminate exposed to elevated temperatures, resulting in oxidative degradation c paper-phenolic laminate exposed to elevated temperatures, resulting in further cross-linking followed by oxidative degradation d heat-resistant glass fiber polyester resin laminate exposed to very high degradative temperatures and e same material and treatment as d except that the specimens were under stress during the exposure stress-rupture. It is concluded that the effects of the various environments on the mechanical properties of the plastics under study can be predicted accurately by use of a parameter of the equation of state representing a second-order chemical reaction. Author
- Laminates and Composite Materials