The Production And Recycling Of Car Tyres
Natural rubber is most commonly obtained from the Hevea Braziliensis tree, from South America. The rubber is taken as latex, a colloidal dispersion of nanoscale rubber particles in water (1). In the early 1900s C.D. Harris showed that natural rubber consisted of repeating units, and it was later proven that the units were joined in long chains. Rubber can be made synthetically by joining isoprene units.
Isoprene Poly(isoprene)
(2-methylbuta-1,3-diene) Natural Rubber
Fig. 1 The structure of natural rubber and the monomer isoprene.
Natural rubber has a 98% cis configuration across the double bond. This arrangement gives rubber its property of increasing strength when stretched. This is by allowing the chains to line up and form crystalline regions. In the addition polymerisation of natural rubber, the two double bonds in isoprene open up to form a polymer that contains only one double bond (2). One problem......
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