Ultrafiltration membanes made of polyacrylonitrile.
Part II. Transport behaviour
The ultrafiltration process in a static system with stirring for three types of macromolecular compounds — polyethylene glycols) (PEG), dextrans and proteins — of various molecular masses has been investigated for the pressure range of 0.1—0.5 MPa. Membranes have been prepared from polyacrylonltrile solutions in dimethylformamide with different concentration and from spinning solution of poly- acrylonitrile. The transport rate in respect to solutions of macromolecular substances has been evaluated by means of ultrafiltration rate and relative permeability. It has been found that the ultrafiltration rate depends on membrane porosity, molecular mass of polymer, concentration of its solution and pressure. All the types of membranes studied completely retain proteins, whereas the degree of retention for PEG'S and dextrans depends on the same factors as the ultrafiltration rate, with the exception of solution concentration. The differences in the retention degree of various polymers of similar molecular mass have been discussed and explained.
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