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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 reduced membrane mechanical properties, insufficient local polymerization, and uneven local morphology. To achieve the effect of reducing the number of use, reducing the cost of film production, and avoiding pollution

Active Publication Date: 2011-09-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The membrane prepared by this method, due to bromomethylated poly(1,4-dimethyl 2,6 phenylene oxide) and chloroacetylated poly(1,4-dimethyl 2,6 phenylene oxide) There are respectively bromomethyl and chloromethyl, and these two groups have side reactions of chain transfer 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 After mixing evenly, the casting solution was obtained; the casting solution was coated on a polypropylene cloth with a thickness of 0.10mm, and the base film was obtained after in-situ polymerization at 70°C for 7 hours; finally, the base film was soaked in mass The quaternization reaction was carried out in a 10% trimethylamine aqueous solution for 36 hours, washed with deionized water, and 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 to...

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 mixed uniformly to obtain a casting solution, which was coated on a polypropylene cloth with a thickness of 0.10 mm, and thermally initiated in-situ polymerization at 80° C. for 8 hours, and finally carried out in a trimethylamine aqueous solution with a mass fraction of 10%. 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 1.64mmolg -1 ,OH - The conductance is 0.025S cm -1 , indicating that the membrane has good electrical conductivity, suitable water content and ion exc...

Embodiment 3

[0022] Mix 4ml of p-chloromethylstyrene with 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 evenly, a casting solution was obtained; the casting solution was coated on a polypropylene cloth with a thickness of 0.10 mm, and thermally initiated in-situ polymerization at 80° C. for 48 hours, and finally in a trimethylamine aqueous solution with a mass fraction of 10%. 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.

[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) has introduced p-chloromethyl styrene monomer and gamma-(methacryloxy) propyltrimethoxysilane in toluene Copolymerize with azobisisobutyronitrile as an initiator, then add a small molecule silane coupling agent and react with water to obtain a casting solution, coat it on a non-woven fabric, evaporate the solvent at room temperature and th...

Claims

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Application Information

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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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