Natural rubber : It is obtained as latex from rubber trees. The latex is coagulated with formic acid or acetic acid. The coagulated volume is then squeezed.
The raw natural rubber is a soft gummy and sticky volume. It is not soluble in water, alkalies and dil. Acids but soluble in carbon disulphide, chloroform, ether, petrol and benzene. It absorb a large volume of water. It has minimum tensile strength and elasticity.
Destructive distillation of natural rubber provides mainly isoprene (2-methyl butadiene).
Thus isoprene is a monomer of natural rubber the no. of isoprene quantity is 11,000 to 20,000 which related together in a chain.
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