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Question
How does the presence of double bonds in rubber molecules influence their structure and reactivity ?
How does the presence of double bonds in rubber molecules influence their structure and reactivity ?
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Solution
Natural rubber is cis-polyisoprene. It is obtained by polymerization of isoprene units at 1, 4 positions. In rubber molecule, double bonds are located between C2 and C3 of each isoprene unit. These cis - double bonds do not allow the polymer chain to come closer. Therefore, only weak van der waals' forces are present. Since, the chains are not linear, they can be stretched just like springs and exhibit elastic properties.
Natural rubber is cis-polyisoprene. It is obtained by polymerization of isoprene units at 1, 4 positions. In rubber molecule, double bonds are located between C2 and C3 of each isoprene unit. These cis - double bonds do not allow the polymer chain to come closer. Therefore, only weak van der waals' forces are present. Since, the chains are not linear, they can be stretched just like springs and exhibit elastic properties.
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