1. Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany; Synthopol Chemie Dr. rer. pol. Koch GmbH & Co. KG, Alter Postweg 35, D-21614 Buxtehude, Germany; and Department of Polymer Science and Materials, Dalian University of Technology, Zhongshan Road 158 116012 Dalian, Republic of China