PH sensitive polyvinylidene fluoride gel film and preparation method thereof
A polyvinylidene fluoride gel film and vinylpyridine gel technology are applied in the field of pH-sensitive gel film and its preparation, and can solve the problem of poor separation performance and pollution resistance, insufficient modification degree of polyvinylidene fluoride, etc. problem, to achieve the effect of easy industrialization, simple equipment and simple process
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Embodiment 1
[0020] (1) Preparation of pH-sensitive polymer gel: 5.0 g of monomer AA, 0.05 g of initiator AIBN and 0.5 g of crosslinking agent MBAA were mixed and dissolved in 300 mL of absolute ethanol, and N 2 30min, stirring at a constant temperature of 65°C for 8h; the prepared mixture was evaporated to dryness, and dried in a vacuum oven at room temperature for 24 hours to obtain the polymer PAA gel;
[0021] (2) Preparation of casting solution: dissolve PVDF powder and PAA gel prepared in step (1) in N, N-dimethylformamide (DMF) in different blending ratios, and stir at 65°C to obtain complete transparency The solution was left to defoam for 2h under vacuum conditions to obtain a PAA gel content of 0%, 0.5%, 1.5% and 2.5%, and a casting solution with a mass concentration of 16% (wt%);
[0022] (3) Gel film preparation: Pour the casting solution obtained in step (2) onto a dry, smooth glass plate, scrape it evenly with a glass rod to form a film, and immerse in a 25°C ethanol-water mi...
Embodiment 2
[0024] (1) with embodiment 1;
[0025] (2) Preparation of casting solution: dissolve PVDF powder and PAA gel prepared in step (1) in N-methylpyrrolidone in different blending ratios, stir at 75°C to obtain a completely transparent solution, and statically Place it for defoaming for 3 hours to obtain casting solutions with PAA gel contents of 0%, 0.5%, 1.5% and 2.5%, and a mass concentration of 16% (wt%);
[0026] (3) with embodiment 1.
Embodiment 3
[0028] (1) with embodiment 1;
[0029] (2) Prepare casting solution: dissolve PVDF powder and PAA gel prepared in step (1) in N,N-dimethylacetamide in different blending ratios, stir at 75°C to obtain a completely transparent solution, Standing for defoaming under vacuum conditions for 3 hours, the PAA gel contents were respectively 0%, 0.5%, 1.5% and 2.5%, and the mass concentration was 16% (wt%) casting solution;
[0030] (3) with embodiment 1.
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