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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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Natural rubber is cis-polyisoprene which is shown as: The cis-configuration at double bonds does not allow the polymer chains to come closer for effective interactions and hence, intermolecular forces are quite weak. As a result, natural rubber (cis-polyisoprene) has a randomly coiled structure and hence shows elasticity.
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