1. Chemical Engineering Department, School of Engineering, Virginia Commonwealth University, 601 West Main Street, Richmond, Virginia 23284-3028, Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan, and Dipartimento di Chimica e Chimica Industriale, Universitá di Pisa, UdR Pisa-INSTM, Via Risorgimento 35, 56126 Pisa, Italy