Integrally asymmetical, isoporous block copolymer membranes in flat sheet geometry
A technology of block copolymers and geometric shapes, which is applied in the field of preparing monolithic asymmetric block copolymer membranes with flat geometric shapes, and can solve problems such as difficult and reliable production
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[0027] According to another preferred embodiment of the invention, the polymer solution contains at least one metal salt. Preferably, the metal is selected from elements of the second main group of the periodic system of elements, such as Mg, Ca or Sr, or from non-toxic transition metals, such as Fe. More preferably, the salt is an organic salt of Mg, Ca or Sr, most preferably magnesium acetate. Metals of the second main group of the periodic system are biocompatible, making them preferred for use in membranes with biological or medical applications. The supporting role of the salts in the phase separation can be explained by the fact that the metal salts lead to the formation of partially charged polyelectrolyte micellar cores, which have a positive effect on the precipitant-induced phase separation.
[0028] According to yet another preferred embodiment, the polymer solution comprises at least one carbohydrate, polyfunctional alcohol, polyfunctional phenol and / or polyfuncti...
Embodiment 1 and comparative Embodiment 1
[0037] A block copolymer of polystyrene-b-poly-4-vinylpyridine (PS-b-P4VP) with a molecular weight of 100 kg / mol and 25 wt% of P4VP was dissolved in dimethylformamide (DMF) and tetrahydrofuran ( THF) to generate a solution of at least one amphiphilic block copolymer in a solvent. The concentration of PS-b-P4VP in the solution was 25 wt%. DMF and THF were each present at a weight concentration of 37.5 wt%.
[0038] The polymer solution was applied to the glass plate using a spatula, thereby forming a cast polymer solution with a thickness of 200 μm on the glass plate. Then, the glass plate with the cast polymer solution was placed between two plate electrodes with a distance of 5.8 cm, and then a direct current electric field of 30 kV was applied for 10 seconds.
[0039] Thereafter, the glass plate with the cast polymer solution was immersed in a water bath after standing for 5 seconds, causing a phase inversion to produce a block copolymer film in a flat plate geometry. Aft...
Embodiment 2 and comparative Embodiment 2
[0045] Example 1 was repeated except that the concentration of PS-b-P4VP was 20 wt%, and an electric field of 10 kV was applied for 10 seconds before immersing the glass plate with the cast polymer solution in a water bath. Also, for comparison, a comparative film was prepared according to the method of Example 2 without electric field treatment. Instead, the glass plate with the casting polymer solution was left to stand for 5 seconds, and then the glass plate with the casting polymer solution was immersed in a water bath.
[0046] The surface morphology of the block copolymer film in the slab geometry according to the invention and the comparative block copolymer film in the slab geometry film was measured using a scanning electron microscope (SEM), as image 3 shown in a and 3b.
[0047] image 3 The surface morphologies of the as-prepared films are shown (a) by casting (5 s) followed by application of an electric field at a voltage of 10 kV for 5 s; (b) by casting in air...
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Abstract
Description
Claims
Application Information
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