Preparation and characterization of silicone membranes for supported liquid membrane applications
1993; Elsevier BV; Volume: 76; Issue: 2-3 Linguagem: Inglês
10.1016/0376-7388(93)85213-g
ISSN1873-3123
AutoresJames S. Gill, U.R. Marwah, B. M. Misra,
Tópico(s)Chemical Synthesis and Characterization
ResumoPoly organo-silicone menbranes were prepared from dimethyldichlorosilane (DMDCS) as the starting material. The preparation roughly involved three steps: hydrolysis of DMDCS, preparation of silicone gum from the hydrolysed product and crosslinking of the silicone gum with tetraethoxysilane (TEOS), using a tin-salt catalyst. It is shown that swelling of silicone membranes in non-polar solvents can be greatly reduced by incorporating a large amount of TEOS in the membrane matrix. The water and non-polar solvent uptake, chemical and thermal stability, nitrogen gas permeability and tensile strength of the membranes were studied. The porosity and pore size of membranes moderately swollen in non-polar solvent indicate that these membranes are suitable for application as supported liquid membrane (SLM). The transport of rare earth samarium ions through these membranes using di(2-ethyl hexyl) phosphoric acid (D2EHPA) as extractant are reported.
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