Oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer 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 Problems such as ionomers and few ionized functional group sites in the main chain can achieve good output effects, improved ion conductivity, and good stability

Active Publication Date: 2020-12-11
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer and preparation method thereof
  • Oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer and preparation method thereof
  • Oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 A kind of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group and its preparation method

[0057]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, y=0.1.

[0060] The preparation method of the above-mentioned quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group comprises the steps:

[0061] S1: Preparation of mesogens containing oxazole groups

[0062] Mix 5g (40.94mmol) of p-hydroxybenzaldehyde, 29.97g (122.82mmol) of 1,6-dibromohexane, 5.66g (40.94mmol) of potassium carbonate, and then add N,N-dimethyl 100 mL of methyl formamide, 80 ° C constant temperature reflux for 8 hours, after purification, the intermediate product A was obtained;

[0063] 9.34g (32.75mmol) of intermediate product A, 4.84g (39.30mmol) of 2-amino-4-methylphenol and 150mL of dichlorometha...

Embodiment 2-6

[0081] Embodiment 2-6 A kind of preparation method of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group

[0082] Embodiment 2-6 is respectively a kind of preparation method of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group, their steps are basically the same as the preparation method in Example 1, the difference is that in the preparation process Combined with the fine adjustment of common sense in the field and the difference of process parameters, the different process parameters are shown in Table 1:

[0083] Table 1 embodiment 2-6 technological parameter

[0084]

[0085]

[0086] Among them, in the oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer prepared in Example 2, x=0.77, y=0.23; the oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer prepared in Example 3 In the ionomer, x=0.8, y=0.2; x=0.84, y=0.16 in the quaternary ammoni...

Embodiment 7

[0087] Example 7 The structure, thermal behavior and electrical performance detection experiment of quaternary ammonium salt side chain liquid crystal ionomer containing oxazole group

[0088] The structure, thermal behavior and electrical properties of the quaternary ammonium salt side chain liquid crystal ionomer containing oxazole groups prepared in Example 1 were determined, wherein the phase transition temperature and phase transition enthalpy were tested by differential scanning calorimeter ; The ionic conductivity is tested by an impedance meter. The result is as follows:

[0089] figure 1 It is the H NMR spectrum of the oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer prepared in Example 1. Depend on figure 1 It can be seen that the structure of the liquid crystal ionomer of the present invention is consistent with the expected idea.

[0090] Containing the oxazole group mesogen (6BrPBMe), the side chain polymer liquid crystal (PM...

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Abstract

The invention belongs to the technical field of materials, and discloses an oxazole group-containing quaternary ammonium salt side chain liquid crystal ionomer and a preparation method thereof. The structural formula of the ionomer is shown in the specification, and in the formula, x/y is more than or equal to 3.35/1 and less than or equal to 49/1, polyethyleneimine is a polymer main chain, benzoxazole with an adjustable proportion is a side chain liquid crystal element, and a quaternary ammonium group is an ionic functional group. The preparation method comprises the steps of side chain liquid crystal element preparation, main chain compound preparation, quaternization reaction and the like. The liquid crystal ionomer overcomes the defect of unstable acid-base conditions of ester liquid crystal ionomers, has good structural stability, provides polyion functional groups and heteroatom introduction sites, has thermotropic liquid crystal phase behavior and good ion conductivity, and thepreparation method is simple to operate and can be used for producing a polymer electrolyte membrane of a fuel cell.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a liquid crystal ionomer and a preparation method thereof, in particular to a quaternary ammonium salt side chain liquid crystal ionomer containing an oxazole group 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 ionomers, including main chain type and side chain type liquid crystal ionomers, etc., and have the orderliness and ionic polymerization of liquid crystal polymers It is widely used in polymer additives, high-strength fibers, coatings, membrane materials, etc. [0003] Synthesizing the structure of liquid crystal ionomers is quite difficult. It is necessary to ensure the introduction of mesogens and the construction of ionic groups. Although the existing main chain type liquid crystal ionomers can obtain stable liquid crystal phase behavior, the degree of ...

Claims

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Application Information

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Patent Type & Authority Applications(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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