Polybenzimidazole-polyethylene glycol grafted copolymer and preparation and application thereof

A technology of polyethylene glycol grafting and polybenzimidazole, which is applied in the field of polybenzimidazole-polyethylene glycol graft copolymer and its preparation and application, and can solve the problems such as the limitation of the mobility of polyethylene oxide chain segments , to achieve excellent flame retardancy, mild reaction conditions and high thermal stability

Active Publication Date: 2016-06-01
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the polyethylene oxide segment is connected to the main chain of polyethersulfone, which is part of the polymer backbone, and the mobility of the polyethylene oxide segment is severely restricted.

Method used

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  • Polybenzimidazole-polyethylene glycol grafted copolymer and preparation and application thereof
  • Polybenzimidazole-polyethylene glycol grafted copolymer and preparation and application thereof
  • Polybenzimidazole-polyethylene glycol grafted copolymer and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Synthesis of chlorine-terminated polyethylene glycol monomethyl ether

[0031] Under nitrogen or argon protection and magnetic stirring, add 75g of polyethylene glycol monomethyl ether with an average molecular weight of 350 to a 500mL dry three-necked flask, heat to 80°C, and drop 15mL of thionyl chloride into the reaction flask , control the rate of addition to 2 seconds / drop, after the dropwise addition, continue to react for 4 hours, then raise the reaction temperature to 110°C, continue to react for 1 hour, connect the reaction bottle to a negative pressure device to remove excess chlorination sulfoxide, cooled to room temperature, and the product was collected to obtain chlorine-terminated polyethylene glycol monomethyl ether with an average molecular weight of about 1000.

[0032] Chlorine-terminated polyethylene glycol monomethyl ethers of other molecular weights can be synthesized by selecting polyethylene glycol monomethyl ether raw materials wit...

Embodiment 2

[0034] Example 2: A poly(2,2'-(4,4'-oxydiphenylene)-5,5'-bisbenzimidazole)-polyethylene glycol segment with an average molecular weight of 1000 Synthesis of Diol Graft Copolymer

[0035]Under nitrogen or argon protection, add 4.0 g (0.02 mol) poly(2,2'-(4,4'-oxydiphenylene)-5,5'-biphenylene to a 500 mL dry three-necked flask and imidazole) and 150 mL of anhydrous dimethyl sulfoxide, stirred, and after the polymer was safely dissolved, 0.48 g (0.02 mol) of sodium hydride was added to the reaction flask, and the reaction was carried out at room temperature for 4 hours, and then the temperature was raised to 80°C for reaction 2 hours, a dark purple solution was obtained, and 20 g (0.02 mol) of chlorine-terminated polyethylene glycol monomethyl ether with an average molecular weight of 1000 was added to the reaction flask, and the reaction was continued for 5 hours at 80 ° C, and the reaction solution was slowly poured into deionized In water, the precipitated solid was washed th...

Embodiment 3

[0037] Example 3: A poly(2,2'-(4,4'-oxydiphenylene)-5,5'-bisbenzimidazole)-polyethylene glycol segment with an average molecular weight of 5000 Synthesis of Diol Graft Copolymer

[0038] The chlorine-terminated polyethylene glycol monomethyl ether with an average molecular weight of 5000 is used to replace the chlorine-terminated polyethylene glycol monomethyl ether with an average molecular weight of 1000 in Example 1, and the chlorine-terminated polyethylene glycol monomethyl ether and poly The molar ratio of (2,2'-(4,4'-oxydiphenylene)-5,5'-bibenzimidazole) is 1:3, and other conditions and steps are the same as in Example 1 to obtain poly Poly(2,2'-(4,4'-oxydiphenylene)-5,5'-bisbenzimidazole)-polyethylene glycol graft copolymer product with an average molecular weight of ethylene glycol segment of 5000 According to its nuclear magnetic resonance spectrum, the content of polyethylene glycol in its structure is calculated to be 71wt%.

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Abstract

The invention discloses synthesis of a polybenzimidazole-polyethylene glycol grafted copolymer and a preparation method of a crosslinking membrane of the copolymer.The preparation method comprises the steps that under protection of nitrogen or argon, a secondary amino group (N-H) in a polybenzimidazole structure reacts with sodium hydride or lithium hydride to generate polybenzimidazole polyanions, then the polybenzimidazole polyanions and polyethylene glycol monomethyl ether chloride are subjected to a grafting reaction to obtain the polybenzimidazole-polyethylene glycol grafted copolymer, and the polybenzimidazole-polyethylene glycol grafted copolymers with the different polyethylene glycol chain lengths and contents can be prepared by controlling the using amount of sodium hydride or lithium hydride and adopting polyethylene glycol monomethyl ether chloride with the different average molecular weights; a lithium salt electrolyte, butanedinitrile and the polybenzimidazole-polyethylene glycol grafted copolymer are dissolved into organic solvent, casting is performed for membrane preparing, and then the all-solid-state electrolyte membrane with the good mechanical property and the higher lithium ion conductivity is obtained.The membrane has the potential application prospect in the fields of lithium ion batteries and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polybenzimidazole-polyethylene glycol graft copolymer and its preparation and application. Background technique [0002] Due to the advantages of high specific energy, long cycle life, high cell voltage, low self-discharge rate, wide operating temperature range, and environmental friendliness, lithium-ion batteries have been widely used in mobile phones, laptop computers and other fields. Pure electric vehicles powered by lithium-ion batteries are an important development direction in the field of new energy vehicles, and have already been applied in practice. However, lithium-ion batteries generally have the problem of low safety, which seriously hinders their wide application as power batteries in electric vehicles. There are many factors that affect the safety of lithium-ion batteries, among which diaphragm and electrolyte are the two most important. Important factor. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08G65/48C08G65/337C08G73/18C08J5/22C08L87/00
CPCC08G65/337C08G65/48C08G73/18C08G81/00C08J5/2256C08J2387/00
Inventor 房建华郭晓霞应黎彬梁乃强谢一凡金闪闪刘功益
Owner SHANGHAI JIAO TONG UNIV
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