Tensile Properties of Neoprene below the Glass Transition Temperature
Elastomeric materials exhibit large extension and forcible quick retraction over a rather limited temperature range known as the rubbery plateau region . At temperatures below this, they behave like glasses, and the transition from a rubbery to a glassy material takes place within a narrow temperature range, which can normally be described by a single transition temperature T g . Above T g , the mechanical properties can best be described using dynamic tests which measure creep, stress relaxation, damping, or stress-strain parameters. The latter are usually obtained by varying stress or strain sinusoidally from frequencies of 0.1 Hz to at least 104Hz. Due to the dependence of the mechanical properties on frequency, it is often necessary to cover this entire range, either by direct measurement or by applying the time-temperature superposition principle .
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