1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, P. R. China
2. Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
3. Beijing Engineering Research Center of Synthesis and Application of Waterborne Polymer, Beijing University of Chemical Technology, Beijing 100029, P. R. China