For a general overview of carbocationic polymerization and two commercially important products made by this process (polyisobutylene and butyl rubber) please refer to this document.
This document first appeared on www.stewartstechnologies.com and summarizes events leading up to the development of aqueous carbocationic polymerization systems for PIB and butyl rubber.
The following is a portion of Dr. Lewis' Ph.D. dissertation that describes these aqueous carbocationic polymerization systems in detail.
Some of this work is detailed in the following journal article:

• Lewis, S. P.; Henderson, L.; Parvez, M. R.; Piers, W. E.; Collins, S. J. Am. Chem. Soc. 2005, 127, 46-47.