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Natural rubber is made of repeating units. It is obtained from Latex from Trees. Natural: monomer polymer Isoprene poly(isoprene) (2-methylbuta-1,3-diene) natural rubber (Dienes are alkenes with two double bonds) In early attempts of producing synthetic rubber, polymerisation of dienes was used but this produced rubber with both a cis and trans isomer mixture. Only cis rubber was preferred because it had a higher boiling point than trans rubber. Better quality of rubber was obtained by polymerising butadiene to produce poly(cis-1,3-butadiene). Rubber of a higher quality is a copolymer, which can be obtained by combining dienes with alkenes. Synthetic: monomer polymer Butadiene poly(cis-1,3-butadiene) A process called emulsion polymerisation is used to produce a 'natural like' rubber. In this process different reactants are polymerised in water to produce rubber. Both Synthetic and Natural rubber are obtained by addition polymerisation. They both have double bonds in monomers of their isomers. When the monomers react to produce polymers, they both break...

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