Abstract
This paper describes the reaction of the highly reactive NCO group as present in diisocyanate with the basic OH group as present in cellulose acetate in a mixture of dichloromethane and t-butyl alcohol, thereby producing minimally crosslinked cellulose acetate, bearing urethane groups and consequently yielding membranes by using the Kesting [1,2] dry method. Verification of urethane group through infrared spectroscopy, discussion of the transport characteristics of the membrane by means of a reverse osmosis testing system, testing the membrane's tensile strength and observation of the structure of the membrane pores are presented. The results indicated that significant improvements were observed with respect to the salt rejection of the modified cellulose acetate membrane as well as to its tensile strength. However, these improvements were accompanied by a slight decrease in the water flux.
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