1. Department of Polymer Science and Engineering, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States
2. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
3. Department of Chemical Engineering, University of Massachusetts Amherst, 686 N Pleasant St., Amherst, Massachusetts 01003, United States