1. Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
2. The Dow Chemical Company, Core R&D, Building 1702, Midland, Michigan 48674
3. Dow Benelux B.V., Packaging and Specialty Plastics R&D, P.O. Box 48, 4530 AA Terneuzen, The Netherlands
4. Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109