Why does industrial rubber have high elasticity?

The high elasticity of industrial rubber is mainly determined by its molecular structure and intermolecular forces, as follows:

Molecular chain structure: The molecular chains of industrial rubber are long - chain molecules formed by the connection of a large number of repeating units. These molecular chains have high flexibility and are not rigid - fixed, but can rotate and bend freely within a certain range. For example, the molecular chain of natural rubber contains a large number of carbon - carbon double bonds, which make the molecular chain have good flexibility.

Molecular chain cross - linking: In the processing of rubber, a cross - linked structure is usually formed between molecular chains through processes such as vulcanization. Cross - linking can connect different molecular chains together to form a three - dimensional network structure. This cross - linked structure makes the rubber not slip relatively when it is stretched by an external force, but resists the external force through the elongation and deformation of the molecular chains. When the external force is removed, the molecular chains will return to their original state under the limitation of the cross - linking points, thus showing high elasticity.

Intermolecular forces: There are certain intermolecular forces between rubber molecular chains, such as van der Waals forces. These forces can help the molecular chains interact with each other to resist the external force when the rubber is subjected to an external force. At the same time, after the force is removed, it also helps the molecular chains return to their original positions, which plays a certain auxiliary role in the elasticity of rubber.