Styrenic thermoplastic elastomer/polystyrene composite membrane and preparation method thereof

A thermoplastic elastomer and styrene-based technology, which is applied in the field of quaternary ammonium salt type anion exchange membrane alkaline fuel cells, can solve the problem that polystyrene lacks toughness, swelling and damage, mechanical stability and ion transport properties are difficult to give full play to benzene. The performance of ethylene-based thermoplastic elastomers, etc., to achieve good mechanical properties and dimensional stability, and improve the effect of ion transmission efficiency

Active Publication Date: 2019-01-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the original design goal of styrene-based thermoplastic elastomers was not used to prepare anion exchange membranes, it is difficult for current commercially available materials to give full play to the due performance of styrene-based thermoplastic elastomers in terms of mechanical stability and ion transport performance.
Unlike styrene-based thermoplastic elastomers, the entire molecular chain of polystyrene has benzene rings, which is suitable for obtaining continuous ion transport channels through the above-mentioned functionalization process, and is theoretically more suitable for the preparation of anion exchange membranes. However, polystyrene Styrene lacks toughness, and its corresponding film material is easy to break, and it is prone to swelling and damage after functionalization

Method used

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  • Styrenic thermoplastic elastomer/polystyrene composite membrane and preparation method thereof
  • Styrenic thermoplastic elastomer/polystyrene composite membrane and preparation method thereof
  • Styrenic thermoplastic elastomer/polystyrene composite membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] 2g of SEBS (6mmol styrene unit) was added into a three-necked flask equipped with a magnetic stirring bar, and 30mL of carbon tetrachloride was added thereto. After it was dissolved at 35°C, 0.56 mL (4.8 mmol) of anhydrous tin tetrachloride was added to the above solution under an ice-water bath and stirred for 30 minutes. Then 1.8 g (9.6 mmol) BCMB was added dropwise to the solution, and reacted at 18° C. for 24 hours. After the reaction is over, pour the reaction solution into dilute hydrochloric acid solution to remove the catalyst, then pour it into ethanol to obtain the crude product, dissolve it in tetrahydrofuran and precipitate it with ethanol again, and wash it with ethanol and water until there is no chloride ion in the solution Then vacuum dry at 35°C for 12 hours.

[0022] Weigh 0.5g chloromethylated SEBS, dissolve it with 10ml chloroform at room temperature, add 0.079mL TMHDA under ice-water bath after the dissolution is complete, stir vigorously for 5 min...

Embodiment 2

[0025] 2g of SEBS (6mmol styrene unit) was added into a three-necked flask equipped with a magnetic stirring bar, and 30mL of carbon tetrachloride was added thereto. After it was dissolved at 35°C, 0.70 mL (6 mmol) of anhydrous tin tetrachloride was added to the above solution under an ice-water bath and stirred for 30 minutes. Then, 3.4 g (18 mmol) of BCMB was added dropwise to the solution, and reacted at 18° C. for 24 hours. After the reaction is over, pour the reaction solution into dilute hydrochloric acid solution to remove the catalyst, then pour it into ethanol to obtain the crude product, dissolve it in toluene and precipitate it with ethanol again, and wash it with ethanol and water until there is no chloride ion in the solution Then vacuum dry at 35°C for 12 hours.

[0026] 2gPS(M n =11000) (20 mmol styrene unit) was added to a three-necked flask equipped with a magnetic stirrer, and 60 mL of carbon tetrachloride was added thereto. After it was dissolved at 35° C...

Embodiment 3

[0031]2g of SEBS (6mmol styrene unit) was added into a three-necked flask equipped with a magnetic stirring bar, and 30mL of carbon tetrachloride was added thereto. After it was dissolved at 35°C, 0.84 mL (7.2 mmol) of anhydrous tin tetrachloride was added to the above solution under an ice-water bath and stirred for 30 minutes. Then 5.4 g (28.8 mmol) of BCMB was added dropwise to the solution, and reacted at 18° C. for 24 hours. After the reaction is over, pour the reaction solution into dilute hydrochloric acid solution to remove the catalyst, then pour it into ethanol to obtain the crude product, dissolve it in xylene and precipitate it with ethanol again, and wash it with ethanol and water until there is no chlorine in the solution After ionization, dry in vacuum at 35°C for 12 hours.

[0032] 2gPS(M n =8000) (20 mmol styrene unit) was added to a three-necked flask equipped with a magnetic stirrer, and 60 mL of carbon tetrachloride was added thereto. After it was dissol...

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Abstract

The invention relates to a styrenic thermoplastic elastomer / polystyrene composite membrane and a preparation method thereof. The membrane material is prepared from styrenic thermoplastic elastomer andpolystyrene as matrices by the following steps: functionalizing and blending the styrenic thermoplastic elastomer and the polystyrene in form of solutions of different proportions, adding a cross-linking agent, preparing the membrane, and performing quaternary ammoniating and alkalifying under a non-homogeneous phase state to obtain a series of anion exchange membranes. The prepared styrenic thermoplastic elastomer / polystyrene composite membrane has the following advantages: 1) the ion transmission efficiency is obviously improved by effectively adjusting and controlling a microphase separation structure in the membrane by a simple and easy physical composition technique; and 2) the toughness of the styrenic thermoplastic elastomer and high strength of the polystyrene are combined, so thecomposite membrane has good mechanical properties and dimensional stability.

Description

technical field [0001] The invention relates to a styrene-based thermoplastic elastomer / polystyrene composite membrane and a preparation method thereof, belonging to the field of quaternary ammonium salt type anion exchange membrane alkaline fuel cells. Background technique [0002] As an efficient and clean energy conversion device, anion exchange membrane fuel cells have many advantages such as high electrode reaction efficiency, use of non-precious metal catalysts, and low fuel permeability. As its key component, the anion exchange membrane is not only a separator for the fuel and oxidant of the cathode and anode, but also an OH - Conductor, its performance directly determines the quality of the anion exchange membrane fuel cell. [0003] In recent years, styrene-based thermoplastic elastomers have been used in anion exchange membranes due to their unique structure and performance advantages. They are modified by styrene block (PS) functional modification to introduce qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/22C08L53/02C08L25/06C08F8/24C08F297/04C08F112/08H01M8/1041H01M8/1072
CPCC08F8/24C08J5/2287C08J2353/02C08J2425/06H01M8/1041H01M8/1072C08F112/08C08F297/04Y02E60/50
Inventor 赵忠夫孟繁志张春庆刘伟白振民师悦
Owner DALIAN UNIV OF TECH
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