Quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method thereof

A quaternary ammonium salt, oxazole-based technology, applied in the field of quaternary ammonium salt side chain liquid crystal ionomer and its preparation, can solve the problem of affecting the stability of liquid crystal ionomer and its application research, and it is difficult to obtain high molecular weight Ionomers, few ionized functional group sites in the main chain, etc., to achieve a reasonable limit on the molecular weight of raw materials, good output effects, and improved ion conductivity

Active Publication Date: 2022-05-31
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing main chain type liquid crystal ionomers can obtain stable liquid crystal phase behavior, the degree of copolymerization is difficult, and it is difficult to obtain high molecular weight ionomers, and the main chain can provide few ionized functional group sites, and the introduction of heteroatoms Difficult; the existing side-chain liquid crystal ionomers mostly contain ester groups, and the mesogens are connected to the main chain through ester bonds, including side-chain cholesteric liquid crystal ionomers, polyacrylate liquid crystal ionomers, etc. For example, the polyw-pyridinium alkyl acrylate structure synthesized by Bazuin et al. in 2000 is:
[0004] This ester-based chemical structure has the problem of easy hydrolysis and broken bonds under certain humidity and acid / alkali conditions
Seriously affected the stability and application research of liquid crystal ionomers based on ester group linkage

Method used

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  • Quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method thereof
  • Quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method thereof
  • Quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method thereof

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Experimental program
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Embodiment 1

Embodiment 1 A kind of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method

A kind of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group, its structural formula is as follows:

[0058]

[0059] In the formula, x+y=1, x=0.9, and y=0.1.

The preparation method of the above-mentioned quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group comprises the steps:

S1: prepare mesogen containing oxazole group

p-Hydroxybenzaldehyde 5g (40.94mmol), 1,6-dibromohexane 29.97g (122.82mmol), potassium carbonate

5.66g (40.94mmol), etc. were mixed, and then 100mL of N,N-dimethylformamide dried with molecular sieves was added, and the temperature was returned to a constant temperature of 80°C.

Flow for 8 hours to obtain intermediate product A after purification;

With intermediate product A9.34g (32.75mmol), 2-amino-4-methylphenol 4.84g (39.30mmol) and 150mL

Dichloromethane...

Embodiment 2-6

[0084]

[0085]

Embodiment 7

[0092]

[0094] As can be seen from Table 1, 6BrPBMe, PMe6, and PMe6Me of the present invention are all thermotropic liquid crystals. The cooling liquid crystal phase regions are

[0099] The side chain type liquid crystal ionomer mesogen of the present invention connects the liquid crystal monomer to the main chain through a nucleophilic substitution reaction,

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Abstract

The invention belongs to the technical field of materials, and discloses a quaternary ammonium salt side-chain liquid crystal ionomer containing oxazole groups and a preparation method thereof. The structural formula of the ionomer is 3.35 / 1≤x / y≤49 / 1 in the formula, wherein polyethyleneimine is the main chain of the polymer, benzoxazole with adjustable ratio is the side chain mesogen, and the quaternary ammonium group is Ionic functional groups; the preparation method of the present invention includes steps such as preparation of side chain mesogens, preparation of main chain compounds, and quaternization reaction. The liquid crystal ionomer of the present invention overcomes the defect of unstable acid-base conditions of ester liquid crystal ionomers, has good structural stability, provides multiple ion functional groups and heteroatom introduction sites, and has thermotropic liquid crystal phase behavior and good ion conductivity. , the preparation method is simple to operate, and can be used to produce polymer electrolyte membranes for fuel cells.

Description

Quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and preparation method thereof technical field The invention belongs to material technical field, relate to a kind of liquid crystal ionomer and preparation method thereof, specifically a kind of An oxazole group-containing quaternary ammonium salt side-chain liquid crystal ionomer and a preparation method thereof. Background technique [0002] In the prior art, liquid crystal ionomers are developed on the basis of liquid crystal polymers and ionic polymers, including Main chain type and side chain type liquid crystal ionomers, etc., have the order of liquid crystal polymers and the ion conduction of ionic polymers at the same time It is widely used in polymer additives, high-strength fibers, coatings, membrane materials, etc. Synthesis of liquid crystal ionomer structure is more difficult, both to ensure the introduction of mesogens, but also to ensure that the ionic groups Construct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/04C09K19/38
CPCC08G73/0206C08G73/0213C09K19/3842C08G2250/00Y02E60/50
Inventor 陈新兵刘国庆陈沛安忠维
Owner SHAANXI NORMAL UNIV
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