CBSENEETJEEClass 12

Natural rubber is a polymer of which monomer?

Answer

Natural rubber is a polymer of isoprene, that is, 2-methyl-1,3-butadiene.

The working

Name the monomer

The repeating unit of natural rubber is isoprene, chemically known as 2-methyl-1,3-butadiene.

Type of polymer

Natural rubber is cis-1,4-polyisoprene, formed by the polymerisation of many isoprene units.

Geometry

The cis configuration about the double bonds gives natural rubber its elastic, coiled structure.

Vulcanisation

Heating rubber with sulphur (vulcanisation) cross-links the chains to improve strength and elasticity.

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