Homogeneous anion-exchange membrane and preparation method thereof
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The technology of anion exchange membrane and crosslinking agent is applied in the field of homogeneous anion exchange membrane and its preparation. , The effect of stable homogeneous performance
Active Publication Date: 2013-09-18
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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The steps of this method are complicated, and the quaternization process of soaking trimethylamine and ethylenediamine aqueous solution will destroy the original structure of the base membrane, resulting in low strength of the ionic membrane, and there may be small cracks that affect the membrane performance.
Moreover, this quaternization reaction by soaking is a solid-liquid heterogeneous reaction, which is carried out through the erosion and penetration of amines, which will cause uneven distribution of ion groups in the obtai
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Embodiment 1
[0020] Dissolve 3g of methyl brominated polyphenylene ether in 9ml of N,N dimethylformamide solution at 50°C, and pass trimethylamine gas into it for 4 hours under mechanical stirring to obtain a casting solution, and coat the film on a glass plate at 60°C After drying, the anion exchange membrane is obtained.
[0021] Carry out infrared test to above-mentioned brominated polyphenylene ether, the result is: 500-600cm -1 Corresponding to the stretching vibration peak of C-Br in brominated polyphenylene ether, 3,000-3,100cm -1 and 1620-1580 respectively correspond to the C-H and C-C stretching vibration peaks of the benzene ring, indicating the presence of a bromomethyl group. After dissolving and aminating it, at 990-810cm －1 The new peaks that appear correspond to N + -(CH 3 ) 3 , demonstrating the presence of quaternary ammonium groups.
[0022] Water content and ion exchange capacity tests showed that the water content and anion exchange capacity of the quaternized mem...
Embodiment 2
[0024] Using the same operation process as in Example 1, except that the solvent N, N dimethylformamide was replaced by 9 ml of N methylpyrrolidone, a film with a similar structure was obtained.
[0025] It is measured that the water content and ion exchange capacity of the anion exchange membrane prepared by the present embodiment are 86% and 2.19mmol / g-dry film respectively, and the membrane resistance is 2.24Ω·cm 2 , the ion mobility number is 0.93.
Embodiment 3
[0027] The same operation process as in Example 1 was adopted, but the solvent was replaced with 9 ml of a 1:1 mixed solvent of N, N dimethylformamide and N methylpyrrolidone. A membrane with a similar structure was obtained.
[0028] It is measured that the water content and ion exchange capacity of the anion exchange membrane prepared in this embodiment are 88% and 2.25mmol / g-dry film respectively, and the membrane resistance is 1.98Ω·cm 2 , the ion mobility number is 0.92. Experimental data show that the membrane has good conductivity and high anion selectivity, and can be applied in the field of electrodialysis.
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Abstract
The invention discloses a homogeneous anion-exchange membrane and a preparation method thereof. The preparation method is characterized by comprising the following steps: performing a reaction to obtain a uniform membrane liquid by taking chloromethylated vinyl benzene, vinyl benzene or/and alkyl vinyl benzene as a monomer, divinylbenzene as a crosslinking agent, benzoyl peroxide or azodiisobutyronitrile as an initiator, and quaternized bromomethylated poly(1, 4-dimethyl-2, 6-phenylene oxide) or quaternized chloracetylated poly(1, 4-dimethyl-2, 6-phenylene oxide) as a high molecular enhancer; carrying out a reaction to obtain a uniform membrane liquid and drying the membrane to obtain the anion-exchange membrane. The anion-exchange membrane is high in exchange capacity, good in electrochemical property, uniform in structure and good in heat resistance. As a previous functionalized reaction process is adopted without post-treatment steps, the membrane liquid is uniform and easy to coat, so that the membrane-forming property is good. The anion-exchange membrane obtained is high in mechanical strength, and the ion exchange radicals are uniformly distributed. Products in different structural forms and functions can be obtained by adjusting the content of polymers, types of solvents, quaterisation temperature and time and degree of crosslinking and changing the types of supporters.
Description
technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a homogeneous anion exchange membrane and a flow casting method preparation route thereof. Background technique [0002] Anion exchange membranes are widely used in electrodialysis, diffusion dialysis, membrane electrolysis, fuel cells, electrochemical sensors, etc., and their development and improvement have always attracted the attention of the theoretical and industrial circles. Homogeneous anion exchange membranes are more widely used in electrodialysis and proton exchange membranes because of the chemical bonds between the fixed groups and the main body of the membrane phase, which have the advantages of uniform structure and low resistance. [0003] Chinese patent ZL90103412.6 discloses a paste method for preparing anion exchange membranes, which consists of alkylene acrylates or alkylene oxides (monomers), divinylbenzene, etc. (crosslinking agent), Polyvinyl...
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