Describe the changes in properties that are likely to occur when the temperature is lowered below the Tg for an elastomer. What does this indicate about the usable lower temperature range for elastomers?
What will be an ideal response?
As with most plastic materials, when the temperature of an elastomer is lowered below its Tg, the polymer will embrittle. This occurs because the long-range flexibility of the polymer is decreased and the intermolecular forces increase as the polymer motion is reduced with the reduction in temperature. There fore, below Tg, elastomers are not elastomeric but are, rather, hard and brittle. The lower temperature range for elastomers is, therefore, the Tg.
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