College;
of;
Life-Science;
and;
Chemistry,;
Tianshui;
Normal;
University,;
Tianshui;
741001,;
China;
College;
of;
Life;
Science,;
Northwest;
Normal;
University,;
Lanzhou;
730070,;
China;
Key;
Laboratory;
of;
Polymer;
Materials;
of;
Gansu;
Province,;
Lanzhou;
730070,;
China;