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Monomer in situ polymerization-based homogeneous anion-exchange membrane and preparation method thereof

An anion exchange membrane and in-situ polymerization technology, which is applied in the field of homogeneous anion exchange membranes based on in-situ polymerization of monomers and their preparation, can solve the problems of insufficient local polymerization, reduced membrane mechanical properties, and uneven local morphology. To achieve the effect of reducing the cost of film production, reducing the number of use, and avoiding pollution

Active Publication Date: 2013-01-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membranes prepared by this method, due to bromomethylated poly(1,4-dimethyl 2,6 phenylene oxide) and chloroacetylated poly(1,4-dimethyl There are respectively bromomethyl and chloromethyl, and these two groups have chain transfer side reactions in the free radical polymerization process, so that a large amount of initiators need to be added to ensure that the initiation is complete; in addition, due to the existence of this chain transfer reaction , leading to insufficient local polymerization during the polymerization process, which makes the local morphology of the film uneven, and also reduces the mechanical properties of the film, making the film brittle and fragile

Method used

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  • Monomer in situ polymerization-based homogeneous anion-exchange membrane and preparation method thereof
  • Monomer in situ polymerization-based homogeneous anion-exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 4ml of p-chloromethylstyrene and 0.08ml of divinylbenzene to form a mixed solution, dissolve 1g of phenolphthalein polyether ketone in this mixed solution, then add 0.08g of dibenzoyl peroxide, and wait until all components are dissolved And after mixing evenly, the casting solution is obtained; the casting solution is coated on a polypropylene cloth with a thickness of 0.10 mm, and the base film is obtained after in-situ polymerization at 70 ° C for 7 hours; finally, the base film is soaked in The quaternization reaction was carried out in a 10% trimethylamine aqueous solution for 36 hours, washed with deionized water, and then placed in the air at room temperature to dry naturally to obtain an anion exchange membrane.

[0016] Infrared testing is carried out on the base membrane and anion exchange membrane prepared above: for the base membrane: 791-812cm -1 Corresponding to the C-Cl stretching vibration peak in p-chloromethyl styrene, 1745-1760cm -1 Corresponding...

Embodiment 2

[0019] Mix 4ml of p-chloromethylstyrene and 0.24ml of divinylbenzene to form a mixed solution, dissolve 1g of phenolphthalein polyether ketone in this mixed solution, then add 0.08g of dibenzoyl peroxide, and wait until all components are dissolved and mix uniformly to obtain a casting solution, which is coated on a polypropylene cloth with a thickness of 0.10mm, and is thermally initiated at 80°C for in-situ polymerization for 8h, and finally in a 10% trimethylamine aqueous solution by mass fraction The quaternization reaction was carried out for 48 hours, washed with deionized water, and placed in the air at room temperature to dry naturally to obtain an anion exchange membrane.

[0020] The water content of the anion exchange membrane prepared in this example is 66.0%, and the ion exchange content is 1.64mmol g -1 ,OH - The conductance is 0.025S·cm -1 , indicating that the membrane has good electrical conductivity, suitable water content and ion exchange content, and meet...

Embodiment 3

[0022] Mix 4ml of p-chloromethylstyrene and 0.80ml of divinylbenzene to form a mixed solution, dissolve 1g of phenolphthalein polyether ketone in this mixed solution, then add 0.08g of dibenzoyl peroxide, and wait until all components are dissolved And after mixing uniformly, the casting solution is obtained; the casting solution is coated on a polypropylene cloth with a thickness of 0.10mm, and the in-situ polymerization is initiated at 80°C for 48h, and finally the mass fraction is 10% trimethylamine aqueous solution The quaternization reaction was carried out in the medium for 48 hours, washed with deionized water, and then placed in the air at room temperature to dry naturally to obtain an anion exchange membrane.

[0023] It is measured that the water content of the anion exchange membrane prepared in this example is 7.5%, and the ion exchange content is 0.54mmol g -1 ,OH - The conductance is 0.004S·cm -1 ,

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Abstract

The invention discloses a monomer in situ polymerization-based homogeneous anion-exchange membrane and a preparation method thereof. The preparation method is characterized by comprising: adding 0.08 to 0.80 milliliter of divinylbenzene into each 4 milliliters of chloromethyl styrene monomer, adding 0.5 to 2 grams of phenolphthalein-based polyether ketone and 0.04 to 0.20 grams of dibenzoyl peroxide or azodiisobutyronitrile, uniformly mixing to form membrane casting solution, uniformly coating on a reinforced fabric, and heating at 70 to 130 DEG C for 6 to 48 hours for in-situ polymerization;and soaking the obtained basic membrane in trimethylamine aqueous solution at a mass percentage concentration of 10 to 40 percent to perform a quaterisation for 6 to 48 hours, washing and drying. Theobtained ion exchange content of the anion-exchange membrane is high, the OH-conductivity of the anion-exchange membrane is high, the membrane phase is uniform, the structure of the membrane is stable, the mechanical strength is high, the heat resistance is high, and the membrane can be developed in series to satisfy the demands for the membranes in different fields. The method of the invention avoids using harmful solvent, is simple in product and low in cost and is a green and economic production process.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to an anion exchange membrane and an in-situ polymerization ansolvization preparation method thereof. Background technique [0002] Anion exchange membrane is a key component of membrane electrolysis, electrodialysis, differential pressure dialysis and fuel cell technologies, and is widely used in metallurgy, chemical industry, biology and energy. Therefore, its development and improvement have attracted more and more people's attention. [0003] Holland "Journal of Membrane Science" (Journal of Membrane Science, 2008, 321, 299-308) introduced the use of p-chloromethylstyrene monomer and γ-(methacryloxy)propyltrimethoxysilane in toluene Azodiisobutyronitrile is used as an initiator for copolymerization, and then a small molecular silane coupling agent is added to react with water to obtain a casting solution, which is coated on a non-woven fabric, and the solvent is e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/28B01D67/00B01D69/10B01J41/12C08F212/14C08F212/36C08F2/44C08J7/12C08J5/22B01J41/14
Inventor 徐铜文林小城吴亮
Owner UNIV OF SCI & TECH OF CHINA
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