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

Inactive Publication Date: 2013-06-26
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing polyvinylidene fluoride (PVDF) membrane pore functional modification degree is not enough, and the separation performance and pollution resistance are not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a pH sensitive polyvinylidene fluoride (PVDF) gel film and a preparation method thereof. The pH sensitive PVDF gel film comprises the following components in percentage by weight: 0.5 to 2.5 percent of pH sensitive macromolecular polymer gel and 97.5 to 99.5 percent of PVDF polymer. The preparation method comprises the following processes of: a) preparing the pH sensitivemacromolecular polymer gel, namely, dissolving pH sensitive polymer monomers and a cross linking agent into absolute ethanol, and performing free radical polymerization under nitrogen protection condition to obtain the pH sensitive polymer gel; b) preparing casting solution, namely, dispersing the pH sensitive polymer gel obtained by the step (a) into an organic solvent, gradually adding a certain amount of PVDF powder, and performing dissolution and degassing to obtain the casting solution; and c) preparing the gel film, namely, scraping the casting solution obtained by the step (b) to form a liquid film on a clean and flat glass plate, and curing the liquid film in a coagulating bath to form the film. The PVDF gel film prepared by the method has the aperture size of 100 to 300 nm; and the inner surfaces of holes consist of the pH sensitive polymer gel which can give a response according to the environmental pH change to change the sizes of the film holes, so the PVDF gel film can beused for the intelligent selective separation of separated substances.

Description

technical field [0001] The invention relates to a pH-sensitive gel membrane and a preparation method thereof, in particular to a pH-sensitive polymer gel blended with polyvinylidene fluoride (PVDF) to obtain a polyvinylidene fluoride whose membrane pores can be adjusted with pH The vinyl film and its preparation method belong to the field of polymer science and technology. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent aging resistance and UV resistance, and has good chemical stability. It is not corroded by strong oxidants such as acids and alkalis and halogens at room temperature. It also has excellent thermal stability and mechanical strength. It is a Separation membrane material with good comprehensive performance. At present, PVDF separation membranes have been successfully and widely used in chemical, biochemical, electronics, food, textile and other industrial fields. However, hydrophobic PVDF membranes often encounter problems such as me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34
Inventor 陈熙陈莉赵义平陈蓓蓓宋其梦
Owner TIANJIN POLYTECHNIC UNIV
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