The molecular retention characteristic for mucopolysaccharides through PAN ultrafiltration membrane with a molecular cut-off of 10 000Da under an electric field of 90V/cm electric strength were investigated.

Steric-hindrance pore model for separation of uncharged solutes by nanofiltration with molecular weight cut-off as parameters;

Method for obtaining molecular weight cut-off of nanofiltration membrane;

Although ultrafiltration is an efficient disinfection process for removing pathogenic microorganisms such as bacteria,viruses and parasites, it is relatively ineffective in removing the natural organic matter because of its high molecular weight cutoff.

Objective: To investigate the impact of retain molecular weight of milipore filters on the effect of purification and compare it with the effect of purification made by the method of alcohol precipitation.

Preparation of poly (phthalazinone ether nitrile ketone) ultrafiltration membrane with low molecular weight cut-off;

Study on small molecular weight cut-off(MWCO) blend ultrafiltration membrane(Ⅲ)——Post-treatment and comparison of chemical stability between PVDF UF membrane and PVDF/PVAc blend UF membrane;