Preparation of microporous membranes from cation exchange membranes prepared by the paste method

Abstract

SynopsisA microporous membrane is prepared by treating the cation exchange membrane (Fe+++ form) with an H,O, aqueous solution. The cation exchange membrane is prepared by the paste method: the base membrane is prepared beforehand and then sulfonated. The preparative conditions of the base membrane were studied in connection with the characteristics of the resultant microporous membrane. Furthermore, the availability of the microporous membrane for ultrafiltration was studied by using an aqueous solution of a bovine hemoglobin.

Self-Assembled Monolayers on Electroless Gold Impart pH-Responsive Transport of Ions in Porous Membranes

“…35 The pore size of these membranes is a function of water content and is thus poorly controlled, leading to reduced permselectivity. Porous ion-selective membranes have been prepared by etching of polymer ion-exchange membranes, 36 chemical modification of preformed ultrafiltration membranes, 37 and removal of inorganic fillers from a polymer blend. 38 The procedure described in this work, we believe, has several advantages over those techniques.…”

Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

“…The characteristics of membranes used are presented in Table I. Figure 1 The hydration of microporous Neosepta (1) cation-and (2) anion-exchange membranes. The membranes were regenerated with 0.5 M HCl and 0.5M NH,OH, conditioned with 0.5M NaCl, and thoroughly washed with deionized water.…”

“…af swollen polymer, ml I g Dependence of(1,2) specific surface of pores and (l', 2') specific volume of membrane on specific volume of swollen polymer in microporous Neosepta ion-exchange membranes. (1, 1') Cation-exchange and (2, 2' ) anion-exchange membranes.where A260 and A280 are the absorbances at 260 and 280 nm, respectively, measured by a diode array spectrophotometer (Hewlett Packard, U.S.A.) .…”

Microporous polypropylene sheets containing polymethylsilsesquioxane filler

“…The porosity of the sheet ( E ) and the tortuosity factor of pore (4) can be related to KO and Bo as follows: (6) where KO is the Knudsen permeability coefficient where 6/kl and k are constant (0.8 and 2.5, respectively ) as estimated by Carman; l4 and m , the equivalent pore size as shown below. The average molecular velosity of a gas (U; molecular weight, M) is shown as follows:…”