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Cationic polymer and preparation method thereof, and anionic exchange membrane and preparation method thereof

A technology of cationic polymer and anion exchange membrane, applied in the field of anion exchange membrane and its preparation, cationic polymer, can solve the problems of low conductivity, poor alkali resistance, low mechanical strength of anion exchange membrane, etc. The effect of strong alkali resistance and easy and accurate control of ionic group content

Inactive Publication Date: 2015-08-19
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a cationic polymer to solve the problems of low mechanical strength, low electrical conductivity and poor alkali resistance of the anion exchange membrane prepared by the existing cationic polymer

Method used

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  • Cationic polymer and preparation method thereof, and anionic exchange membrane and preparation method thereof
  • Cationic polymer and preparation method thereof, and anionic exchange membrane and preparation method thereof
  • Cationic polymer and preparation method thereof, and anionic exchange membrane and preparation method thereof

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Embodiment 1

[0052] The cationic polymer of the present embodiment has a structural formula as shown in formula I-1:

[0053]

[0054] However, n is an integer of 10-150.

[0055] The preparation method of the cationic polymer of the present embodiment comprises: according to the ratio that the molar ratio of quaternary ammonium monomer, aryl monomer and trifluoromethanesulfonic acid is 1:1:10, make quaternary ammonium monomer, aryl monomer The solid and trifluoromethanesulfonic acid were added to a three-necked flask with nitrogen, stirred and reacted at 60°C for 24 hours, and then the reaction solution was slowly dropped into ice water, and the precipitate was collected and dried to obtain the cation shown in formula I-1 polymer. The structure of the obtained polymer was confirmed to be consistent with the expectation by H NMR spectrum and elemental analysis. The intrinsic viscosity of the obtained cationic polymer was 0.5 dL / g.

[0056] The reaction formula is as follows:

[0057...

Embodiment 6

[0063] The cationic polymer of the present embodiment has a structural formula as shown in formula I-2:

[0064]

[0065] However, n is an integer of 10-150.

[0066] The preparation method of the cationic polymer of the present embodiment, is to adopt embodiment 1 gained with CF 3 SO 3 - The cationic polymer of anion carries out ion exchange, specifically comprises: adopting the method identical with embodiment 1 to obtain the anion shown in formula I-1 as CF 3 SO 3 - Cationic polymer, the polymer is placed in a concentration of 1mol / L sodium chloride solution and soaked for 48 hours, the anion shown in the formula I-2 is Cl - of cationic polymers. The structure of the obtained polymer was confirmed to be consistent with the expectation by H NMR spectrum and elemental analysis.

Embodiment 7

[0068] The cationic polymer of the present embodiment has a structural formula as shown in formula I-3:

[0069]

[0070] However, n is an integer of 10-150.

[0071] The preparation method of the cationic polymer of the present embodiment comprises: according to the ratio that the molar ratio of quaternary ammonium monomer, aryl monomer and trifluoromethanesulfonic acid is 1.1:1:30, quaternary ammonium monomer, aryl monomer The solid and trifluoromethanesulfonic acid were added to a three-necked flask with nitrogen, stirred and reacted at 25°C for 8 hours, and then the reaction solution was slowly dropped into ice water, and the precipitate was collected and dried to obtain the cation shown in formula I-3 polymer. The structure of the obtained polymer was confirmed to be consistent with the expectation by H NMR spectrum and elemental analysis. The resulting cationic polymer had an intrinsic viscosity of 1.6 dL / g, indicating a high molecular weight polymer.

[0072] The ...

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Abstract

The invention discloses a cationic polymer and a preparation method thereof, and an anionic exchange membrane and a preparation method thereof. The cationic polymer has a structural formula as shown in a formula I. In the formula I, Q is a quaternary ammonium group; Ar is a group with aromatic rings included in two ends of the main chain; and n is an integer in a range of 10 to 150. The preparation method for the cationic polymer comprises the following steps: under the protection of inert gas, mixing quaternary ammonium monomer, aryl monomer and trifluoromethanesulfonic acid, carrying out reaction at 0 to 60 DEG C for 1 to 24 hours, then adding the obtained reaction liquid into ice water, and collecting precipitate so as to obtain the cationic polymer. According to the invention, the main chain of the cationic polymer is mainly composed of benzene rings, which enables the prepared anionic exchange membrane to have good mechanical properties, and the side chain of the cationic polymer contains cationic groups (quaternary ammonium groups) which have high alkali resistance; meanwhile, the cationic polymer is simple to synthesize, has controllable ionic group content and can be applied to production of the anionic exchange membrane with good mechanical properties, high conductivity and strong alkali resistance.

Description

technical field [0001] The invention belongs to the technical field of anion exchange membranes, specifically relates to a cationic polymer, and also relates to a preparation method of the cationic polymer, an anion exchange membrane prepared by using the cationic polymer and a preparation method thereof. Background technique [0002] Anion exchange membrane is a kind of high molecular polymer membrane containing fixed cationic groups and has selective permeability to anions, also known as ion selective permeability membrane. The anion exchange membrane consists of three parts: the polymer main chain with fixed groups, that is, the polymer matrix (also known as the base membrane), the positively charged active groups (ie, cations), and the active groups that can exchange and migrate freely. of anions. [0003] Anion exchange membrane has a very wide range of applications. It is an important part of separation devices, purification devices and electrochemical components. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12C08G61/02C08J5/22
Inventor 张正辉田博文黄婕颖谢欢欢张翠玲郑琦
Owner NANYANG NORMAL UNIV
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