[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
[2] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA
[3] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA
[4] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA
[5] MIT, Dept Chem Engn, Cambridge, MA 02139 USA
[6] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
[7] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
[8] Washington Univ, Dept Chem, St Louis, MO 63130 USA
[9] Washington Univ, Dept Radiol, St Louis, MO 63130 USA