Phenyl-modified PDMS separation membrane, preparation method and application of phenyl-modified PDMS separation membrane in aromatic compound separation
A technology for separating membranes and compounds, used in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low permeation flux, low selective separation, etc., to avoid entanglement, improve spacing, and improve separation selection. Effects of sex and permeability
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[0047] The consistent mobility between the main chain and the side chain groups leads to the stacking of PDMS segments in a highly entangled structure. PDMS membranes used for membrane separation usually require tetraethylorthosilicate as a cross-linking agent for curing.
[0048] The synthetic route of the present embodiment is as follows:
[0049]
[0050] The preparation method is:
[0051] A certain amount of hydroxyl-terminated PDMS-(C 6 h 5 ) 2 Dissolve in n-heptane to make a 10 wt% polymer solution. The casting liquid is crosslinked by using the crosslinking agent tetraethyl orthosilicate and the catalyst dibutyltin dilaurate, wherein the polymer: crosslinking agent: catalyst = 100:10:1 (mass ratio). When the casting solution reaches a suitable viscosity, use a scraper to scrape and coat the porous PVDF support to form a film. The prepared composite film was evaporated at room temperature for 24 hours, and then thermally cross-linked at 70° C. for 12 hours to o...
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