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Preparation method of modified polyphenylene oxide and application thereof

A polyphenylene ether and modification technology, which is applied in the field of preparation of modified polyphenylene ether, can solve the problems of low gas selectivity, insolubility, and decreased transmittance, and achieve improved selectivity, increased transmittance, and improved Effects of Polarity and Selectivity

Inactive Publication Date: 2018-08-28
WEIFANG YUCHENG CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, 2,6-dimethylpolyphenylene ether has not been widely used because of its low selectivity to gases and its inability to dissolve in polar aprotic solvents used in the usual film-forming process.
[0003] At present, the brominated modified polyphenylene ether is different for O 2 and N 2 The transmittance research, the bromination on the benzene ring is beneficial to improve the O 2 and N 2 The transmittance, while the selectivity is basically unchanged; bromination on the methyl group greatly improves the O 2 and N 2 selectivity, but the transmittance drops a lot

Method used

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  • Preparation method of modified polyphenylene oxide and application thereof

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Comparison scheme
Effect test

Embodiment 1

[0024] A kind of preparation method of highly selective modified polyphenylene ether, the steps comprise in sequence:

[0025] 1) Methyl brominated polyphenylene ether:

[0026] Add 2,6-dimethyl polyphenylene ether and catalyst I azobisisobutyronitrile in an amount of 0.5% of the mass of polyphenylene ether to organic solvent I dichloroethane in an amount 5 times the mass of polyphenylene ether , the reaction temperature is 50°C, keep warm until it is completely dissolved, add brominating agent Ⅰ N-bromosuccinimide, add brominating agent Ⅰ and polyphenylene ether molar mass ratio of 0.1:1, under light and catalyst The methyl bromination reaction of polyphenylene ether is realized under the co-initiation of Ⅰ, the reaction is completed, the catalyst Ⅰ is removed, the organic solvent is recovered, and methyl brominated polyphenylene ether is obtained;

[0027] 2) Bromination of benzene ring:

[0028] Add the methyl brominated polyphenylene ether prepared in step 1) to the orga...

Embodiment 2

[0033] A preparation method of modified polyphenylene ether, the steps comprising:

[0034] 1) Methyl brominated polyphenylene ether:

[0035] Add 2,6-dimethyl polyphenylene ether and catalyst I benzoyl peroxide in an amount of 1.5% of the mass of 2,6-dimethyl polyphenylene ether to an organic solvent whose amount is 10 times the mass of polyphenylene ether In Ⅰ dichloropropane, the reaction temperature is 80°C, keep warm until it is completely dissolved, then add brominating agent Ⅰ dibromohydantoin, the molar mass ratio of brominating agent Ⅰ to polyphenylene ether is 0.3:1, under light and catalyst The polyphenylene ether methyl bromination reaction is realized under the co-initiation of Ⅰ, the reaction is completed, the catalyst Ⅰ is removed, the organic solvent is recovered, and the methyl brominated polyphenylene ether is obtained;

[0036] 2) Bromination of benzene ring:

[0037] The methyl brominated polyphenylene ether prepared in step 1) is added to the organic sol...

Embodiment 3

[0042] A preparation method of modified polyphenylene ether, the steps comprising:

[0043] 1) Methyl brominated polyphenylene ether:

[0044] 2,6-dimethyl polyphenylene ether and catalyst I dicumyl peroxide in an amount of 1.0% of the mass of polyphenylene ether are added to the organic solvent I chloroform in an amount of 8 times the mass of polyphenylene ether, and the reaction temperature is 70°C, keep warm until completely dissolved, add brominating agent Ⅰ N-bromosuccinimide, add brominating agent Ⅰ and polyphenylene ether with a molar mass ratio of 0.2:1, under the joint initiation of light and catalyst Ⅰ Realize the methyl bromination reaction of polyphenylene ether, the reaction is completed, catalyst I is removed, the organic solvent is recovered, and methyl brominated polyphenylene ether is obtained;

[0045] 2) Bromination of benzene ring:

[0046] The methyl brominated polyphenylene ether prepared in step 1) is added to the organic solvent II halogenated aromati...

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Abstract

The invention relates to a preparation method of modified polyphenylene oxide and application thereof. The technical problem in the prior art that synthetic polyphenylene oxide is low in gas selectivity and poor in transmittance and is difficultly processed into a film is solved. According to the preparation method of the modified polyphenylene oxide provided by the invention, 2,6-dimethyl polyphenyl ether is respectively subjected to methyl bromination and benzene ring bromination modification in sequence by utilizing free radical reaction and an electrophilic reaction mechanism. The invention further provides a method for preparing a brominated polyphenyl ether asymmetric membrane by using a gel phase transformation method. The polarity and selective permeability of the polyphenyl etherare improved, so that the modified polyphenyl ether material is prepared. The invention is widely applied to the technical field of organic synthesis.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method and application of modified polyphenylene ether. Background technique [0002] 2,6-Dimethyl polyphenylene oxide (PPO) is a thermoplastic polymer with stable physical and chemical properties. It is not only a heat-resistant engineering plastic with a high glass transition temperature, but also has a high resistance to various gases. Due to the higher glass transition temperature and better mechanical strength, it may become an ultra-thin composite membrane for gas separation. 2,6-Dimethylpolyphenylene ether in toluene solution forms a film on the water surface against O 2 The permeation rate is twice as high as that of the silicone rubber composite membrane widely used in medical oxygen-enriched devices, and the N 2 / O 2 The selectivity is much greater than that of silicone rubber. However, 2,6-dimethylpolyphenylene ether has not been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/48B01D53/22B01D67/00B01D69/12
CPCB01D53/228B01D67/00B01D69/122C08G65/485
Inventor 吴多坤王东全秦善宝
Owner WEIFANG YUCHENG CHEM
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