True/False (T/F) for the following statements regarding the unusual thermal response of elastomers: The crosslinking in elastomers causes a negative thermal expansion coefficient The internal energy becomes dominated by the entropic component as the temperature is raised. The thermal expansion of atomic positions causes an increase in free volume ( ) due to energy elasticity, as is true for most materials. A stretched rubber will contract upon heating due to the increase in free volume The entropy elasticity component is smaller for elastomers than for most engineering materials An elastomer will contract upon heating, but only if it is already in a stretched condition