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M. Kabsch, A.M. Mika, T.Z. Winnicki


Modification of poly(vinyl chloride) with polyethylenepolyamines in order to improve its characteristics as a membrane material


Polimery 1991, No 2, 59


DOI: dx.doi.org/10.14314/polimery.1991.059

Summary

PVC under the form of a solution in dimethylformamide has been modified with three types of polyethylenepolyamines (PEPA), namely with diethylenetriamine (DETA), etraethylenepentamine and pentaethylenehexamine. The best results, i.e. the highest value of the ion-exchange capacity of the ultrafiltration membranes formed from the PVC solution after its modification, have been obtained in the case of PVC modified with DETA. The reaction of Cl-atoms substitution in PVC by PEPA has been accompanied by the concurrent reaction of HC1 elimination with the formation of conjugated double bonds. The rate of elimination increases with temperature and with the duration of the modification process. The preliminary investigations of the ultrafiltration membranes formed from PVC solution modified with DETA have shown that their hydraulic permeability is about five time higher than that of similar membranes from unmodified PVC and is equal to 75 ma/(m2 day MPa). Simultaneously, these membranes retain about 68% of methylene blue molecules (molecular mass = 319 g/mole).


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