142 Advances in Polymer Science Editorial Board: A. Abe. A.-C ...

Synthesis of Branched Polymers by Cationic Polymerization 61
Scheme 15
In this process, epoxidation of the double bonds was followed by reduction to
obtain the tert-alcohol which was esterified with methacryloyl chloride in the
subsequent step. While epoxidation was found to be close to quantitative based
on double bond content, reduction was incomplete and the residual epoxy functional
PIB (24–47%) had to be separated by column chromatography before esterification.
It should be noted that this macromonomer was a tert-ester which
might be quite unstable in acidic conditions, and is also more hindered than the