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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