Polyolefin-g-polybenzimidazole grafted copolymer as well as preparation method and application thereof

A technology of graft copolymers and benzimidazoles, which is applied in the field of polyolefin-g-polybenzimidazole graft copolymers and its preparation, can solve problems such as lowering of proton conductivity, lowering of mechanical properties, loss of phosphoric acid, etc.

Active Publication Date: 2020-04-17
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of high-temperature proton exchange membranes, the proton conductivity of PBIs-based proton exchange membranes is heavily dependent on its phosphoric acid doping level (ADL, per mole of polymer repeating units combined phosphoric acid mole number), in order to make this type of membrane have high proton conductivity, a large amount of phosphoric acid needs to be mixed in, which will lead to a significant decline in the mechanical properties of the membrane, so it is necessary to take into account the balance between proton conductivity and mechanical properties; in addition, More phosphoric acid is also easy to lose with the water generated by the cathode during use, which will reduce the proton conductivity of the membrane

Method used

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  • Polyolefin-g-polybenzimidazole grafted copolymer as well as preparation method and application thereof
  • Polyolefin-g-polybenzimidazole grafted copolymer as well as preparation method and application thereof
  • Polyolefin-g-polybenzimidazole grafted copolymer as well as preparation method and application thereof

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[0072] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0073] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0091] Preparation of polyacrylic acid grafted m-polybenzimidazole (PAA-g-mPBI)

[0092] Select polyacrylic acid (PAA) as the main chain, and mPBI as the branched chain synthesis such as figure 2 The PAA-g-mPBI graft copolymer shown in 1# structural formula.

[0093] Add dry mPBI (6.20 g, 0.2 mmol) and PAA (1.44 g, carboxyl 20 mmol) in DMF according to the molar ratio of mPBI and carboxyl group of 1:100 to form a solution with a solid content of 5%, and then pass it into an inert Gas Argon was refluxed at 150°C and stirred for 24h. After the reaction, the solid content of the solution was increased to 20% by rotary evaporation, and then the solution was poured on the PET film to coat the film with a 300 μm doctor blade, and dried at 80° C. to obtain a film with a thickness of about 50 μm.

Embodiment 2

[0095] Preparation of polymethacrylic acid grafted m-polybenzimidazole (PMAA-g-mPBI)

[0096] Select polymethacrylic acid (PMAA) as the main chain, and mPBI as the branched chain synthesis such as figure 2 The PMAA-g-mPBI graft copolymer shown in 2# structural formula.

[0097] Add dry mPBI (6.20g, 0.2mmol) and PMAA (0.87g, carboxyl 10mmol) and dissolve in DMF according to the molar ratio of mPBI and carboxyl group of 1:50 to form a solution with a solid content of 10%, and then pass it into an inert Gas Argon was refluxed at 180°C and stirred for 20h. After the reaction, the solid content of the solution was increased to 20% by rotary evaporation, and then the solution was poured on the PET film to coat the film with a 300 μm doctor blade, and dried at 80° C. to obtain a film with a thickness of 48 μm.

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Abstract

The invention relates to a polyolefin-g-polybenzimidazole grafted copolymer as well as a preparation method and an application thereof. The grafted copolymer is the grafted copolymer of a polyolefin grafted benzimidazole polymer, which is obtained by carrying out a condensation reaction on a terminal amino group in the benzimidazole polymer and a carboxyl group in an olefin polymer with the side chain containing the carboxyl group. According to the present invention, a proton transmission channel is constructed through a phase separation structure of the two chain segments so as to improve theproton conductivity, such that the high temperature proton exchange membrane with the high proton conductivity can be obtained under the low phosphoric acid doping level (ADL is less than 10) condition, and the preparation method is simple, is simple to operate, and can be used for fuel cells, flow cells and the like.

Description

technical field [0001] The invention relates to the field of graft copolymer materials, in particular to a polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application. Background technique [0002] Benzimidazole polymers (PBIs) are polymers containing benzimidazole rings in the main chain structure, which have excellent physical and chemical properties such as chemical stability, thermal stability, flame retardancy and mechanical properties, and are widely used Used in high temperature resistant fabrics, fire retardant materials and filter materials for industrial products, etc. With the rise of fuel cell research, the commonly used perfluorosulfonic acid proton exchange membrane cannot meet the operation of fuel cells under high temperature and low humidity conditions due to defects such as the decrease of proton conductivity and mechanical properties under high temperature and low humidity conditions. Researchers began to look for and study n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02H01M8/103H01M8/1069
CPCC08G81/024H01M8/103H01M8/1069Y02E60/50
Inventor 莫肇华李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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