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M. Bodzek

Ultrafiltration membanes made of polyacrylonitrile.

Part II. Transport behaviour

Polimery 1984, No 7, 267

DOI: dx.doi.org/10.14314/polimery.1984.267


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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