The polymerization process of claim 1, wherein the catalyst system comprises one or more Lewis acid(s) represented by the formula M(RO)nR???mX3-(m+n); wherein M is a Group 13 metal; each RO is a monovalent C1 to C30 hydrocarboxy radical independently selected from the group consisting of an alkoxy, aryloxy, arylalkoxy, alkylaryloxy radicals; each R??? is a monovalent C1 to C12 hydrocarbon radical