1. Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02138, USA
2. Division of Engineering and Applied Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA91125, USA
3. Dow Coating Materials, 400 Arcola Road, Collegeville, PA19426, USA
4. Dow Wire and Cable, 400 Arcola Road, Collegeville, PA19426, USA
5. Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02138, USA