1. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
2. Qingdao Key Laboratory of Polyurea Elastomer, Qingdao Airjj New Materials Co., Ltd., Qingdao 266100, China
3. Shenzhen Institute of Southwest Jiaotong University, Shenzhen 518000, China