1. Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials, College of Science; Northeast Forestry University; Harbin 150040 P.R. China
2. Key Laboratory of Bio-based Material Science and Technology; Northeast Forestry University, Ministry of Education; Harbin 150040 P.R. China
3. Department of Food and Environmental Engineering; East University of Heilongjiang; Harbin 150086 P.R. China