1. Chemistry and Chemical Engineering Liaocheng University 1 Hunan Avenue Liaocheng 252000 Shandong P. R. China
2. Chemistry and Chemical Engineering Jinan University 106 Jiwei Road Jinan 250022 Shandong P. R. China
3. National Rubber Additive Engineering Technology Center 399 Qinghe West Road, Yanggu County Liaocheng 252059 Shandong P. R. China