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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 structural point of view, the natural rubber is a linear ciș- 1,4 -polyisoprene. In this polymer double bonds are located between 'C_2' and 'C_3' of isoprene units. This cis-configuration about double bónds do not allow the chains tó come closer for effective attraction'due to'weak intermiolecular attractions. Hence the natural rubber has a coiled-structure and shows elasticity.
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