Natural and synthetic rubber and vulcanization

Rubber :
Empirical formula : C5H8
Structure :

Natural rubber : Poly isoprene.
Cis isoprene formed by isoprene units which are joined head to tail by 1,4 links.

Trans - isomer : Gutta percha

Natural rubber is manufactured from rubber latex which is colloidal dispersion of rubber in water. Rubber has to be coagulated with acetic acid (or) HCOOH.

Vulcanisation of Rubber :
This process consists of heating a mixture of raw rubber with 'S' and ZnO or Zinc stearate between 373 K to 415 K. On vulcanisation, sulphur forms cross links at the reactive sets of double bonds and the rubber gets stiffened. Tyre rubber - 5% of 'S'.

View the Topic in this Video from 28:22 to 52:10

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