1. The
Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
2. Arkema Inc., 900 First Avenue, King of Prussia, Pennsylvania 19406, United States
3. DuPont Experimental Station, Wilmington, Delaware 19898, United States
4. Department
of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States