Materials
Chitosan with deacetylation degree of 90% and viscosity average molecular weight of 450,000 was purchased from Zhejiang Golden Shell Biochemical Co., Ltd., China. Pebax MH 1657 (containing approximately 60 wt% polyether segments and 40 wt% polyamide segments) was friendly donated by Arkema, France. Ethanol, glutaraldehyde (GA) and acetic acid were purchased from Tianjin Jiangtian Chemical Engineering & Technology Co., Ltd., China. All of the chemicals above were of analytical grade and were used without further purification. Double distilled water was used throughout the study.