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Homogeneous anion exchange membrane and preparation method thereof

An anion exchange membrane and atom transfer technology, applied in the field of homogeneous anion exchange membrane and its preparation, can solve the problems of complex equipment, low grafting efficiency, and increased cost, and achieve high conductivity, easy preparation process, and excellent reaction conditions mild effect

Active Publication Date: 2012-02-29
UNIV OF SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

The above method adopts the plasma irradiation grafting method, the grafting efficiency of this method is not high, and some homopolymers without grafting may be obtained
In addition, the equipment of this grafting method is complicated, the grafting controllability is poor, and it is difficult to control the microstructure of the grafted polymer.
[0005] The preparation method of the anion-exchange membrane reported above generally adopts the following preparation method, that is, soaking in an alkaline functional reagent after film formation to introduce basic functional groups, but this method has the following disadvantages: first, In the film-forming process of the basement membrane, due to the lack of driving force for the separation of the hydrophilic and hydrophobic phases, it is not conducive to the formation of the through-through ion channel, so the conductivity of the prepared anion exchange membrane is not high; secondly, due to the basement membrane and the alkaline function The reaction of chemical reagents is a heterogeneous reaction, which requires a large amount of basic functional reagents, resulting in a waste of basic functional reagents, increased costs, and residual solvents will seriously pollute the environment

Method used

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  • Homogeneous anion exchange membrane and preparation method thereof
  • Homogeneous anion exchange membrane and preparation method thereof
  • Homogeneous anion exchange membrane and preparation method thereof

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preparation example Construction

[0026] The invention discloses a preparation method of a homogeneous anion exchange membrane, which comprises the following steps:

[0027] Add p-chloromethylstyrene to the non-aqueous solution of the basic functionalization reagent, and obtain the basic functionalization monomer after the reaction, and the basic functionalization reagent is trimethylamine, triethylamine, tripropylamine, tributylamine, Imidazole, 1-methylimidazole or guanidine compounds;

[0028] Under the action of a catalyst, the first reaction raw material and the basic functionalized monomer are subjected to atom transfer radical polymerization to obtain a graft polymer, and the first reaction raw material is polyvinylidene fluoride or bromomethylated Poly(1,4-dimethyl-2,6-phenylene oxide);

[0029] The graft polymer is dissolved in the first solvent to obtain a casting solution, and the anion exchange membrane is obtained after coating and casting the casting solution to form a membrane.

[0030] In the...

Embodiment 1

[0051] 1. Preparation of monomer: Collect trimethylamine gas with acetone solvent to obtain acetone solution of trimethylamine with a concentration of 5.0mol / L; measure 123.9mL (0.620mol) of the above solution and place it in a 500mL container with a mechanical stirring device In the three-necked flask; slowly add 30mL (0.207mol) p-chloromethylstyrene (VBC) dropwise into the three-necked flask using a constant pressure dropping funnel, and after reacting at room temperature for 10h, stop the mechanical stirring, and filter the reaction solution with suction , a white solid was obtained, and acetone was added to wash to remove unreacted p-chloromethylstyrene (VBC). This operation was repeated three times, and vacuum-dried at room temperature to obtain a basic functionalized monomer.

[0052] 2. Preparation of grafted polymer: Add 1g of polyvinylidene fluoride (PVDF), 3g of the prepared basic functionalized monomer and 174μL of pentamethyldiethylenetriamine (PMDETA) in a 100mL th...

Embodiment 2

[0057] 1. Preparation of monomer: the same preparation process as in Example 1 was adopted.

[0058] 2. Preparation of the polymer: the same preparation process as in Example 1 was adopted, and the mass of the basic functionalized monomer added was 4 g.

[0059] 3. Film formation: the same preparation process as in Example 1 was adopted.

[0060] After measurement, the water content of the homogeneous anion exchange membrane prepared in this example is 91.6%, the ion exchange capacity is 1.86mmol / g dry film, and the OH - The conductivity is 4.5×10 -2 S / cm.

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Abstract

The invention provides a method for preparing a homogeneous anion exchange membrane. In the method, a graft high polymer is synthesized by an atom transfer radical polymerization process, wherein the hydrophobic-main-chain and hydrophilic-side-chain structure of the graft high polymer is favorable for the phase separation of hydrophilic groups from hydrophobic groups; meanwhile, the graft high polymer has an ion exchange group and can dissolve in a solvent to form a homogenous membrane casting liquid. In a membrane forming process, the phase separation caused by the coexistence of the hydrophilic groups and the hydrophobic groups in the graft high polymer leas to the formation of an ion transfer channel; therefore, the conductivity of the prepared homogeneous anion exchange membrane is high. In the invention, an alkaline functional monomer is also prepared by using an alkaline functional reagent and p-chloromethylstyrene as reaction raw materials, wherein the preparation process of the alkaline functional monomer is easy to control, the reaction conditions are mild, the need of using a large amount of alkaline functional reagent is obviated, and thus the waste of the alkaline functional reagent is avoided.

Description

technical field [0001] The invention relates to the technical field of membranes, in particular to a homogeneous anion exchange membrane and a preparation method thereof. Background technique [0002] At present, anion-exchange membranes are widely used in diffusion dialysis, electrodialysis, alkaline fuel cells, chemical sensors and other fields, so the preparation method and performance of anion-exchange membranes have always been concerned by the theoretical and industrial circles. The preparation method generally adopted in the prior art is: forming a film of a polymer with functional groups, and then soaking in an amine solution to obtain anion exchange groups, thereby preparing an anion exchange membrane. [0003] The preparation method of anion-exchange membrane has been widely reported, for example, Holland "Membrane Science and Technology Journal" (Journal of Membrane Science, 2005,262,1-4) reported the preparation method of polyethersulfone phenolphthalein anion-ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22
Inventor 徐铜文冉瑾
Owner UNIV OF SCI & TECH OF CHINA
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