Abstract
A new approach to the formation of asymmetric ultrafiltration membranes based on insoluble rigid-chain aromatic polyimide (PI) and involving polyacrylonitrile modified by partial cyclization (m-PAN) has been studied. It has been found that m-PAN exerts a favorable effect on the membrane formation and composition: it (i) promotes fast precipitation at the stage of wet formation; (ii) acts as an imidization catalyst that allows for decreasing temperature at the stage of solid-phase thermal imidization; and (iii) it remains as a full-fledged component in the PI/m-PAN membrane. It was shown that up to 20 wt % m-PAN can be effectively introduced into the membrane composition. The membranes have been calibrated using a model mixture of proteins with different molecular weights. The structure, permeability to water, and thermomechanical properties of the membranes have been studied.
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Original Russian Text © G.A. Polotskaya, T.K. Meleshko, A.V. Novoselova, I.V. Gofman, A.E. Polotsky, 2012, published in Membrany i membrannye tekhnologii, 2012, Vol. 2, No. 2, pp. 99–104.
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Polotskaya, G.A., Meleshko, T.K., Novoselova, A.V. et al. New approach to the formation of polyimide ultrafiltration membranes involving modified polyacrylonitrile. Pet. Chem. 52, 527–532 (2012). https://doi.org/10.1134/S0965544112070110
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DOI: https://doi.org/10.1134/S0965544112070110