Weekly topic: 5 Wealth points for those who answer correctly, 2 Wealth points for participation； Question 154

In the high-elasticity state, even under a small external force, it can rapidly undergo significant deformation, and once the external force is removed, the deformation can gradually return to its original level. The ability to undergo significant deformation under such stress, and to return to its original state once the external force is removed, is known as high elasticity. In the viscous flow state, when the temperature rises high enough, under the action of external forces, intense movement of the chain segments causes a relative displacement of the center of mass of the entire molecular chain; the polymer then becomes a completely viscous fluid, and its deformation is irreversible.

Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

The elastomeric state increases as the temperature rises. The deformation in the elastomeric state is time-dependent and involves mechanical relaxation; there are significant thermal effects during the deformation process, with exothermic behavior during stretching and endothermic behavior during retraction. The viscous flow state evolves over time in an irreversible manner.

Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

In the high-elasticity state, even under mild external forces, it can rapidly undergo significant deformation, and once the external force is removed, the deformation can gradually return to its original level. The ability to undergo significant deformation under such stress, and to return to its original state once the external force is removed, is known as high elasticity.    In the viscous flow state, when the temperature rises high enough, under the action of external forces, intense movement of the chain segments causes the center of mass of the entire molecular chain to shift relatively, resulting in the polymer becoming a completely viscous fluid whose deformation is irreversible.

Why not explain the viscoelastic deformation characteristics of polymers in the high-elasticity state and the viscous flow state? Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

Explain separately the viscoelastic deformation characteristics of polymers in the high-elasticity state and the viscous flow state Answer: Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

Even under mild external forces, it can rapidly undergo significant deformation, and this deformation can gradually return to normal once the external force is removed. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.

Even under mild external forces, it can rapidly undergo significant deformation, and once the external force is removed, the deformation can gradually return to its original state. This kind of stress can cause significant deformation, and the ability to return to its original state once the external force is removed is known as high elasticity; the corresponding mechanical state is referred to as the high-elastic state. When the temperature rises high enough, under external force and due to intense movement of the chain segments, the center of mass of the entire molecular chain shifts relative to its position; the polymer then becomes a viscous fluid, and its deformation is irreversible. This mechanical state is known as the viscous flow state.