1. CREPEC, Department of Chemical Engineering, École Polytechnique de Montréal,2900 Édouard Montpetit, P.O. Box 6079, Station Centre-Ville, Montréal, Québec, Canada H3C 3A7; Corporate Strategic Research, ExxonMobil Research and Engineering Company, 1545 Route 22 East, Annandale, New Jersey 08801; and Global Specialty Polymers Technology, ExxonMobil Chemical Company, 5200 Bayway Dr., Baytown, Texas 77520