Explain why polybutadiene is softer than polyisoprene
What will be an ideal response?
Polyisoprene, either cis or trans, has a methyl group that is pendent to the four-carbon backbone repeating unit of the polymer. Polybutadiene has no methyl group attached to its four-carbon repeating unit. This methyl group in polyisoprene interacts with other molecules as the molecules are moved past each other and also causes some restrictions to bending and twisting within each molecule. These intermolecular and intramolecular interactions cause the
polyisoprene to have higher energy that is manifested as higher hardness and higher tensile strength.
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