1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology; 15 Beisanhuan East Road Beijing 100029 P. R. China
2. Department of Macromolecular Science and Engineering; Case School of Engineering, Case Western Reserve University; 10900 Euclid Avenue Cleveland OH 44106 USA
3. Research Center of the Ministry of Education for High Gravity Engineering & Technology, Beijing University of Chemical Technology; 15 Beisanhuan East Road Beijing 100029 P. R. China