房事2黄大学 Guangdong University of Technolopy THE NATURE OF HIGH ELASTICITY High elasticity is caused by entropy change.Under the action of external force, the rubber molecular chain changes from curled state to stretched state,and the entropy decreases.When the external force is removed,the molecular chain spontaneously tends to the state of increased entropy due to thermal motion, and the molecular chain returns to curled state from stretched state,so the deformation is reversible.THE NATURE OF HIGH ELASTICITY High elasticity is caused by entropy change. Under the action of external force, the rubber molecular chain changes from curled state to stretched state, and the entropy decreases. When the external force is removed, the molecular chain spontaneously tends to the state of increased entropy due to thermal motion, and the molecular chain returns to curled state from stretched state, so the deformation is reversible