The monomer of polyisobutylene is isobutylene, which has a double bond between two carbon atoms. The structure of isobutylene is as follows:
\[
\begin{array}{cccc}
& & \text{H} & \\
& \text{H} & \text{C} & \text{H} \\
\text{H} & \text{C} & = & \text{C} \\
&
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