Why Rubber Is Elastic Material

Unlike the rigid materials which store the energy within them in the form of potential energy elastic polymers immediately release the energy in the form of thermal energy.

Why rubber is elastic material. Because viscoelastic materials have the viscosity factor they have a strain rate dependent on time. 3 elastic free energies from theoretical network models. Stress strain isotherms of networks in general fall between the predictions of these two limiting models. When you stretch a rubber band the work done is spent on ordering the polymer chains and it immediately appears as heat released.

A the phantom and b the affine network models. Because these polymers are so long they can be thousands of molecules long they get tangled up in themselves. Erman in encyclopedia of materials. It can be stretched by up to a factor of 10 from its original length and when released returns very nearly to its original length.

An elastomer is a polymer with viscoelasticity i e both viscosity and elasticity and has very weak intermolecular forces generally low young s modulus and high failure strain compared with other materials. The elastic materials are those materials that have the ability to resist a distorting or deforming influence or force and then return to their original shape and size when the same force is removed. The result is a property called elasticity the polymers are elastic. Rubber elasticity refers to a property of crosslinked rubber.

Science and technology 2001. Linear elasticity is widely used in the design and analysis of structures such as beams plates and sheets. An elastomer is a polymer with the property of elasticity generally having notably low young s modulus and high yield strain compared with other materials. The difference between elastic materials and viscoelastic materials is that viscoelastic materials have a viscosity factor and the elastic ones don t.

Elastomers are amorphous polymers existing above their glass transition temperature so that considerable segmental. The term a portmanteau of elastic polymer is often used interchangeably with rubber although the latter is preferred when referring to vulcanisates. Sorbothane is a. This limit called the elastic limit is the maximum stress or force per unit area within a solid material that can arise before the onset of permanent deformation.

Rubber is a member of a larger class of materials called elastomers and it is difficult to overestimate their economic and. That is why rubber bands are elastic. Hence steel is more elastic cite 23rd jul 2019. Natural rubber is made of long chains of molecules called polymers.

For example let us take steel and rubber material of same dimension apply same amount force i e stress but strain is more for rubber than steel. To a greater or lesser extent most solid materials exhibit elastic behaviour but there is a limit to the magnitude of the force and the accompanying deformation within which elastic recovery is possible for any given material. This is why rubber bands are sometimes called elastic bands. No synthetic rubber or polymer can dissipate energy as effectively.