Why are rubbers called elastomers how does the presence of double bond influence structure?
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Rubber is a name given to a lot of different polymers that are all elastomers. That means they can be stretched out and they will return to their original shape when you let go. The first rubber was the natural kind from the sap of hevea trees in Central America.
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In natural rubber,all the double bonds are present in cis-positions,it increases the elasticity of the rubber,as the chains are held together by weak van der waals forces and have coiled structure.However,Gutta-Percha is a natural rubber consisting of double bonds at trans position,thus making it hard and brittle.
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