1. South China Advanced Institute for Soft Matter Science and Technology, School of Molecular Science and Engineering South China University of Technology Guangzhou 510640 China
2. School of Polymer Science and Polymer Engineering The University of Akron Akron OH 44325‐3909 USA
3. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low‐dimension Materials, College of Material Science and Engineering Donghua University Shanghai 201620 China