1. Center for Degradable
and Flame-Retardant Polymeric Materials (ERCEPM-MOE), National Engineering
Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key
Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610064, China
2. Department
of Physics and Soft Materials Research Center, University of Colorado at Boulder, Colorado 80309-0390, United States
3. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States