School of Chemistry and Chemical Engineering;
State Key Laboratory of Urban Water Resource and Environment;
Harbin Institute of Technology;
Harbin 150001;
China;
Daqing Petrochemical Research Center;
Petrochemical Research Institute;
China National Petroleum Corporation;
Daqing 163714;
China;
State Key Laboratory of Polymer Physics and Chemistry;
Changchun Institute of Applied Chemistry;
Chinese Academy of Sciences;
Changchun 130022;
China;
SAXS; Bimodal high density polyethylene; Molecular mobility;