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What are the properties of rubber bands?

Rubber band is a general term for high elastic polymer compounds.
Due to a wide temperature range up and down the room temperature has superior high elasticity, good flexibility, and fatigue resistance, high wear resistance, electrical insulation, water resistance, and good medium resistance, corrosion resistance, high and low temperature resistance and other special properties.
It is any other product does not have, so the rubber band is also known as elastomer, its high elasticity performance in: has a particularly large elastic deformation, can be stretched to 700% or more, 2 deformation after removing the external force, can quickly restore the prototype, permanent deformation is very water, 3 elastic modulus is particularly low, only 105~105Pa.
That is to say, a smaller force will cause a larger deformation of the rubber band.

The high elastic deformation comes from the fact that the key in the chain of macromolecules is relatively easy to rotate, and the whole large molecule is easy to deform under the action of external forces, because the rotational barrier of the key is relatively low, so the modulus is low. After the removal of external forces, the thermal motion of the molecule is easy to automatically restore the original deformation, that is, change in the direction of entropy increase, the entropy of the elastic band stretched system decreases and becomes hot.
So the modulus is high and the tension becomes cool.
 
So what is the degree of high elastic deformation in the end, and at what speed and what range after removing the external force?
The definition in ASTMD1566 is as follows: the material of the rubber band is rubber, and rubber is a material that can quickly and forcefully recover its deformation under large deformation, can be modified, the modified rubber is substantially insoluble in (but can be expanded in) boiling benzene, methyl ethyl ketone, ethanol-toluene mixture and other solvents, the modified rubber at room temperature (18°
-29°
After being stretched to 2 times the original length and kept for 1MIN, it can return to its original length within 1MIN after removing external forces.

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