A kind of polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application

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. Achieve the effects of improving rigidity, improving proton conductivity, and high proton conductivity

Active Publication Date: 2022-03-01
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application
  • A kind of polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application
  • A kind of polyolefin-g-polybenzimidazole graft copolymer and its preparation method and application

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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 graft copolymer and its preparation method and application. The graft copolymer is the grafting of polyolefin grafted benzimidazole polymer obtained by condensation reaction of the terminal amino group in the benzimidazole polymer and the carboxyl group in the side chain carboxyl-containing olefin polymer. branch copolymers. The proton transport channel is constructed by the phase separation structure of the two chain segments, thereby improving the proton conductivity and achieving a high temperature proton exchange membrane with high proton conductivity under the condition of a low phosphoric acid doping level (ADL<10). The preparation method is simple and easy to operate, and can be applied to fuel cells, liquid flow batteries 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 Patents(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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