1. School of Engineering and Science, Jacobs University Bremen, P.O. Box 750561, 28725 Bremen, Germany, BCI Research, ExxonMobil Chemical Europe Inc., European Technology Center, Hermeslaan 2, B-1831 Machelen, Belgium, and CP R&D, ExxonMobil Chemical Technology, Baytown Technology & Engineering Complex-East, 4500 Bayway Drive, Baytown, Texas 77522