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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 and obtained by 1,4-polymerisation of isoprene units. In this polymer, double bonds are located between `C_2` and `C_3` of each isoprene unit. This cis-double bonds do not allow polymer chains to come closer for effective interactions and hence, intermolecular forces are quite weak. As a result, it has randomly coiled structure and shows elasticity.
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CHHAYA PUBLICATION-POLYMERS -SOLVED NCERT TEXTBOOK PROBLEMS
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