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How does the presence of double bonds in...

How does the presence of double bonds in rubber molecules influence their structure and reactivity?

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From the structureal point of view, the natural rubber is a linerar cis01,4, polyisoprene. In this polymer, the double bond are located between `C_(2) and C_(3)` of each isprene unit. The cis-configuraton about double bonds do not allow the chain to come closer for effective interactions and hence intermolecular forces are quite weak. Therefore, the natural rubber has a coiled structure and shows elasticity?
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