Abstract
Cross-linked poly(dienes) (polychloroprene, polyisoprene and polybutadiene) are shown to exhibit crazing when subjected to low strain-rate tensile tests at low temperatures. Conditions for crazing to occur in the polybutadienes are examined. It is found that observable crazing occurs providing the rubbers are (a) slightly oriented, (b) stretched below their glass transition temperature (Tg) and (c) deformed in an environment which is close to its liquefaction or sublimation point. Gases evolved after low temperature testing are shown to be dissolved gases from the test environment. The interrelationship between the mechanical properties of the rubbers, quantity of gas absorbed and the radicals formed by scission of the network molecules is explored.
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