1. Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
2. National Engineering Research Center for Advanced Polymer Processing Technology, Key Laboratory of Advanced Materials Processing & Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou, Henan 450002, China
3. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, United States