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Quaternary ammonium salt ionic liquid crystal polymer with temperature control electronic switch performance and preparation method and application thereof

A technology of quaternary ammonium salt ions and liquid crystal polymers, applied in liquid crystal materials, thermal switch parts, chemical instruments and methods, etc.

Active Publication Date: 2021-01-22
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no relevant reports on the performance of temperature-controlled electronic switches.

Method used

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  • Quaternary ammonium salt ionic liquid crystal polymer with temperature control electronic switch performance and preparation method and application thereof
  • Quaternary ammonium salt ionic liquid crystal polymer with temperature control electronic switch performance and preparation method and application thereof
  • Quaternary ammonium salt ionic liquid crystal polymer with temperature control electronic switch performance and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] A quaternary ammonium salt ionic liquid crystal polymer with temperature-controlled electronic switch performance, specifically, the chemical structural formula of the quaternary ammonium salt ionic liquid crystal polymer P1 containing 1-methylimidazole groups is:

[0111]

[0112] The preparation and testing methods are as follows:

[0113] Step 1: Preparation of small-molecule liquid crystal M with terminal ethylenic bonds

[0114] (1) Preparation of 4-allyloxybenzoic acid: 24.0 g of p-hydroxybenzoic acid was weighed into a 250 mL flask and dissolved in 86 mL of ethanol to obtain an ethanol solution of p-hydroxybenzoic acid. Dissolve 22.86g of potassium hydroxide and 0.172g of potassium iodide in 28.6mL of water. After cooling to room temperature, add dropwise to the ethanol solution of p-hydroxybenzoic acid at a rate of 5-10mL / min in a constant pressure dropping funnel. After stirring at room temperature for 2 h, 20 mL of 3-bromopropene was added dropwise (1-2 h)...

Embodiment 2

[0147] A quaternary ammonium salt ionic liquid crystal polymer with temperature-controlled electronic switch performance, specifically, the chemical structural formula of the quaternary ammonium salt ionic liquid crystal polymer P2 containing 1-butylimidazole group is:

[0148]

[0149] The preparation and testing methods are as follows:

[0150] Step 1: Preparation of small molecule liquid crystal N with terminal ethylenic bond

[0151] (1) Preparation of hydroxyl-containing intermediate 4-(pentanoyloxy)cyclohexanol: In a 250mL three-necked flask equipped with a stirrer, condenser and thermometer, add 11.6g (0.100mol) of 1,4-cyclohexane Alcohol, dissolved in 120mL tetrahydrofuran and a small amount of triethylamine (0.030mol), added dropwise 3.6g (0.030mol) pentanoyl chloride under vigorous stirring, reacted the above material at room temperature for 2 hours, heated to reflux for 18h, distilled 90mL tetrahydrofuran, After cooling, the reaction solution was poured into 200...

Embodiment 3

[0175] A quaternary ammonium salt ionic liquid crystal polymer with temperature-controlled electronic switch performance, specifically the chemical structural formula of the quaternary ammonium salt ionic liquid crystal polymer P3 containing 1-hexylimidazole group is:

[0176]

[0177] The preparation and testing methods are as follows:

[0178] Step 1: Preparation of Small Molecule Liquid Crystal O

[0179] (1) Preparation of 4'-hydroxyl-[1,1'-bis(cyclohexyl)]-4-ol ester of hexanoic acid containing hydroxyl intermediate: in a 250mL three-necked flask equipped with a stirrer, condenser and thermometer , add 19.8g (0.100mol) 4,4'-dihydroxydicyclohexane, dissolve with 160mL tetrahydrofuran and a small amount of triethylamine (0.030mol), add 3.9g (0.030mol) hexanoyl chloride dropwise under vigorous stirring, and the After reacting the above materials at room temperature for 2 hours, heat to reflux for 18 hours, distill 120 mL of tetrahydrofuran, cool, pour the reaction liquid...

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Abstract

The invention discloses a quaternary ammonium salt ionic liquid crystal polymer with temperature control electronic switch performance and a preparation method and application thereof, and belongs tothe field of ionic liquid crystal materials. The structural general formula of the quaternary ammonium salt ionic liquid crystal polymer with the temperature control electronic switch performance is as follows: the quaternary ammonium salt ionic liquid crystal polymer is an ionic liquid crystal compound which is based on a polysiloxane main chain structure, contains an imidazolium bromide salt group and a liquid crystal element, and is formed by polymethylhydrosiloxane, bromopropylene, Nalkyl imidazole and micromolecular liquid crystals containing terminal olefinic bonds. According to the ionic liquid crystal compound, the glass-transition temperature, the conductivity and the liquid crystallinity are regulated and controlled by changing the chemical structure of the polymer on the chemical structure, so that the temperature control electronic switch performance is realized.

Description

technical field [0001] The invention belongs to the field of ionic liquid crystal materials, in particular to a quaternary ammonium salt ionic liquid crystal polymer with temperature-controlled electronic switch performance and its preparation method and application. The quaternary ammonium salt ionic liquid crystal polymer with temperature-controlled electronic switch performance is based on Polysiloxane as the main chain, an ionic liquid crystal polymer containing imidazolium bromide groups. Background technique [0002] Ionic liquid crystal polymer is a type of polymer with ionic groups in chemical structure and liquid crystal properties in performance. It is a new type of polymer developed on the basis of traditional ionic liquids, ionic polymers, and liquid crystal polymers. thing. Both ionic liquid and ionic polymer contain ionic groups. Ionic liquid is a kind of organic salt that shows a liquid state at low temperature. Ionic polymer is a kind of organic polymer cont...

Claims

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Application Information

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IPC IPC(8): C09K19/38C08G77/388C08G77/38H01H37/32
CPCC09K19/3833C08G77/388C08G77/38H01H37/32C09K2219/13Y02P20/54
Inventor 孟凡宝
Owner NORTHEASTERN UNIV
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