Yc. Wang et Fm. Doyle, Formation of epoxy skin layers on the surface of supported Liquid membranes containing polyamines, J MEMBR SCI, 159(1-2), 1999, pp. 167-175
Supported liquid membranes containing polyamine extractants have been stabi
lized with semi-permeable epoxy skin layers. Liquid-vapor interfacial polym
erization reactions were employed to deposit the epoxy layers. Different mo
nomers were explored to investigate their effect on the integrity, morpholo
gy, and chemical inertness of the resulting epoxy layers. Smooth, dense epo
xy layers were formed on membranes containing undiluted 2-butyl-2-ethyl-1,5
-pentanediamine, or 4-(aminomethyl)-1,8-octanediamine, by polymerization wi
th 1,3-butadiene diepoxide vapor. Both amines yielded skin layers that are
more resistant to strong acids than polyamide skin layers. The 4-(aminometh
yl)-1,8-octanediamine yielded a crosslinked epoxy skin layer that could wit
hstand exposure to acetic acid. The resulting stabilized membranes transpor
ted acetic acid at a flux of ca. 100 mu mol/m(2) s. (C) 1999 Elsevier Scien
ce B.V. All rights reserved.