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Method for surface modification of hydrophobic polymer microporous membrane

A hydrophobic polymer and surface modification technology, applied in the field of surface chemistry, can solve the problems of high price, difficulty in synthesis and extraction, and inability to meet industrial production, and achieve the effect of low equipment requirements, good wettability, and easy industrial production

Active Publication Date: 2014-03-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, dopamine is a medical reagent, which is difficult to synthesize and extract, and expensive, and cannot meet the requirements of industrial production at all.

Method used

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  • Method for surface modification of hydrophobic polymer microporous membrane
  • Method for surface modification of hydrophobic polymer microporous membrane
  • Method for surface modification of hydrophobic polymer microporous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 50 mg of catechol and 50 mg of ethylenediamine were dissolved in 100 ml of water, and sodium hydroxide was added to adjust the pH of the solution to 13 to obtain a modified solution. A polypropylene microporous membrane (thickness 25 μm, average pore size 0.1 μm, porosity 40%, contact angle of 10 μl water droplet 122°) was immersed in the modification solution. After reacting at 25° C. for 12 hours, the polypropylene microporous membrane was taken out, washed with deionized water and ethanol in turn, and dried to obtain a modified polypropylene microporous membrane.

[0040] The modified polypropylene microporous membrane obtained in this example has a brownish yellow color, a thickness of 25 microns, an average pore diameter of 0.1 microns, a porosity of 39.5%, and a contact angle of 10 microliters of water droplets of 47°.

[0041] The X-ray photoelectron spectrum (left picture) and optical photo (right picture) of polypropylene microporous membrane before and after m...

Embodiment 2

[0045] Take 10 mg of 3,4-dihydroxytoluene and 20 mg of butanediamine, dissolve them in 100 ml of water / methanol (1:1 by volume) mixed solvent, add potassium hydroxide to adjust the pH value of the solution to 11 to obtain a modified solvent . Polypropylene microporous membrane (thickness 15 μm, average pore size 0.2 μm, porosity 63%, 10 μl water drop contact angle 120°). Immerse in the modifying solution. After reacting at 35° C. for 8 hours, the polypropylene microporous membrane was taken out, washed with deionized water and ethanol in sequence, and dried to obtain a modified polypropylene microporous membrane.

[0046] The modified polypropylene microporous membrane obtained in this example is brownish yellow, with a thickness of 15 microns, an average pore diameter of 0.2 microns, a porosity of 62.7%, and a contact angle of 10 microliters of water droplets of 46°. It can be seen that the hydrophobic microporous membrane Converted into a hydrophilic microporous membrane, ...

Embodiment 3

[0048] Take 30 mg of 3,4-dihydroxybenzoic acid and 100 mg of hexamethylenediamine, dissolve them in 100 ml of water / ethanol (volume ratio 1:2) mixed solvent, add sodium ethoxide to adjust the pH of the solution to 10 to obtain a modified solution. A polyethylene microporous membrane (thickness 50 μm, average pore size 0.4 μm, porosity 20%, 10 μl water drop contact angle 118°) was used. Immerse in the above solution. After reacting at 25° C. for 10 hours, the polyethylene microporous membrane was taken out, washed with deionized water and ethanol in sequence, and dried to obtain a modified polyethylene microporous membrane.

[0049] The modified polyethylene microporous membrane obtained in this example is brownish-yellow, with a thickness of 50 microns, an average pore diameter of 0.4 microns, a porosity of 19.7%, and a contact angle of 10 microliters of water droplets of 50°. It can be seen that the hydrophobic microporous membrane Converted into a hydrophilic microporous me...

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Abstract

The invention discloses a method for surface modification of a hydrophobic polymer microporous membrane. The method comprises the steps of dissolving a pyrocatechol compound and a polyamine molecule in a solvent, and adjusting the mixture to be alkaline so as to obtain a modification solution; soaking the hydrophobic polymer microporous membrane in the modification solution to realize the surface modification of the hydrophobic polymer microporous membrane through reaction, wherein the structural formula of the pyrocatechol compound is shown by a formula I, and in the formula I, R is H, -CH3, -(CH2)nCOOH, -CHO or OH and n is an integer between 0 and 2. The microporous membrane modified by the method disclosed by the invention can be applied in the fields of diaphragms of positive and negative materials of lithium secondary batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries and the like, as well as separation membranes including reverse osmose membranes, micro-filtration membranes, nano-filtration membranes, ultrafiltration membranes, electrodialysis membranes, gas separation membranes and the like to improve the performances of materials and devices.

Description

technical field [0001] The invention relates to a surface modification method of a hydrophobic polymer microporous membrane, which belongs to the field of surface chemistry. Background technique [0002] Polymer microporous membranes are widely used as battery separators (lithium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, polymer batteries, etc.) and separation membranes (reverse osmosis membranes, microfiltration membranes, nanofiltration membranes, ultrafiltration membranes, electrodialysis membrane, gas separation membrane, etc.). Among them, hydrophobic polymer microporous membranes (such as polyolefin, polytetrafluoroethylene, polyvinylidene fluoride, polysulfone, polyethersulfone, and polyimide, etc.) occupy a large market share. However, since polymer microporous membranes are in contact with non-polar media (such as polar electrolytes, aqueous solutions, etc.) and the performance of its constructed devices. Improving the wettability of pol...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08L23/12C08L23/06C08L27/18C08L27/16C08L81/06C08L79/08
Inventor 吴俊杰沈衡王昊赵宁张小莉徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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