[1] SUNY Buffalo, Dept Chem Engn, Buffalo, NY 14260 USA
[2] Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany
[3] N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA
[4] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA