1. Department
of Mechanical Engineering
and the Materials Science and Engineering Program, The University of Texas at Austin, One University Station
C2200, Austin, Texas 78712, United States
2. State Key Laboratory for Modification
of Chemical Fibers and Polymer Materials, College of Materials Science
and Engineering, Donghua University, Shanghai,
201620, P. R. China
3. Department
of Materials Science
and Engineering, University of Science and Technology of China, Hefei, 230036, P. R. China