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Side-chain type liquid crystal polymer liquid crystal physical gel material and preparation method thereof

A side-chain liquid crystal and physical gel technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of low strength, high addition amount, poor self-support, etc., and achieve high modulus, high content and thermal stability. good effect

Active Publication Date: 2017-07-14
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kornfield et al. (Naturematerials, 2004,3(3):177; US20040142117A1) prepared a triblock copolymer organogelator by copolymerizing monomers containing cyanobiphenyl liquid crystal units with styrene, and found that the synthesized Tri-block copolymers can make small molecule liquid crystals (5CB, 4CB) gel, but the disadvantages of the liquid crystal physical gel are low strength, poor self-supporting property, and the storage modulus G' is lower than 10 2 Pa
[0007] Wood et al. (Science, 2011, 334(6052): 79; Langmuir, 2012, 28(22): 8463) found that only in the polymer When the volume fraction of microspheres reaches more than 15%, the modulus of the gel changes from 10 2 Pa starts to rise sharply, and its modulus reaches 10 when the volume fraction reaches about 40% 4 Pa, but its disadvantage is that the addition amount is high. While the high addition amount leads to an increase in the cost of the liquid crystal physical gel, the addition of a large amount of gel factor will have a great impact on the properties of the liquid crystal body, so the polymer microspheres in the liquid crystal physical gel The application of the
[0008] Among the reported liquid crystal physical gel materials, the thermal stability and mechanical properties of liquid crystal physical gel materials are poor, which cannot meet the requirements of material processing and use, which seriously limits the industrial production and market demand of liquid crystal physical gel materials.

Method used

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  • Side-chain type liquid crystal polymer liquid crystal physical gel material and preparation method thereof
  • Side-chain type liquid crystal polymer liquid crystal physical gel material and preparation method thereof
  • Side-chain type liquid crystal polymer liquid crystal physical gel material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take a clean polymer glass tube of 20mm×200mm, add 2.0g (7.60mmol) 4'-methacryloyloxy-4-cyanobiphenyl (MACB) into it, and then add 0.01g / ml of AIBN solution 658.4ul (3.80×10 - 2 mmol), then add refined DMF3.6g, freeze and evacuate, after repeating three times, seal the tube under vacuum, then put the polymerization tube into a constant temperature oil bath at 70°C to carry out polymerization reaction, after the polymerization is completed (by polymerization The viscosity of the system is judged) Put the polymerization tube into cold hydrazine to cool down, so that the polymerization reaction is terminated. Afterwards, the polymer solution was diluted with DMF, and the polymer solution was slowly added to 500ml of ethanol under stirring, precipitated, centrifuged, and vacuum-dried to obtain the target polymer PMACB 1.9g, with a conversion rate of 95%, and a molecular weight of 5.24×10 4 , whose structural formula is:

[0034]

[0035] Weigh 4'-n-pentyl-4-cyanobiph...

Embodiment 2

[0038] Take a clean polymeric glass tube of 20mm×200mm, add 2.0g (8.02mmol) 4'-acryloyloxy-4-cyanobiphenyl (ACB) into it, and then add 0.01g / ml of AIBN solution 658.42ul (4.01×10 - 2 mmol), then add refined DMF3.6g, freeze and evacuate, repeat three times, seal the tube under vacuum, then put the polymerization tube into a constant temperature oil bath at 70°C to carry out polymerization reaction, after the polymerization is completed (by polymerization The viscosity of the system is judged) Put the polymerization tube into cold hydrazine to cool down, so that the polymerization reaction is terminated. Afterwards, the polymer solution was diluted with DMF, and the polymer solution was slowly added to 500ml of ethanol under stirring, precipitated, centrifuged, and vacuum-dried to obtain the target polymer PACB1.94g, the conversion rate was 97%, and the molecular weight was 4.92×10 4 , whose structural formula is:

[0039]

[0040] Weigh liquid crystal small molecule 4'-n-...

Embodiment 3

[0043] Side chain type liquid crystal polymer used is the same as embodiment 1

[0044] Weigh liquid crystal small molecule 4'-n-pentyl-4-cyanobiphenyl (5CB) 4g, add in 25mm * 40mm sample bottle, then accurately weigh the gel factor PMACB, make it 4.0% by mass, heat Stir until completely dissolved, and cool naturally to obtain a liquid crystal physical gel material after the mixture is clarified.

[0045] The liquid crystal physical gel material obtained in this example has a gel disassociation temperature of 82°C and a gel-sol temperature of 86°C.

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PUM

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Abstract

The invention relates to a side-chain type liquid crystal polymer liquid crystal physical gel material and a preparation method thereof. The material contains the following components in percentages by mass: 90.0-99.0% of a liquid crystal material and 1.0-10.0% of a side-chain type liquid crystal polymer. By taking a small molecular liquid crystal as a working substance and the side-chain type liquid crystal polymer as a supporting material, the prepared liquid crystal physical gel material is high in modulus (the energy storage modulus can reach 104Pa above), good in thermal stability (the sol-gel transition temperature exceeds 190 DEG C) and high in small molecular liquid crystal content, and meanwhile, can adjust the chemical structure of the side-chain type liquid crystal polymer to regulate the sol-gel phase transition temperature of the liquid crystal physical gel so as to meet the using demand of different conditions.

Description

technical field [0001] The invention relates to a liquid crystal physical gel material and a preparation method thereof, in particular to a side chain type liquid crystal polymer high modulus liquid crystal physical gel material and a preparation method thereof. Background technique [0002] Liquid crystal is a kind of ordered fluid, which has the fluidity of liquid and the order of crystal at the same time. The unique properties of liquid crystals make them widely used in the electronics industry. Due to the advantages of low power consumption, low driving voltage, and high contrast, liquid crystal displays stand out among many display materials and become one of the most popular display materials in the market. Fluidity is an important attribute of liquid crystals, which enables liquid crystals to respond quickly under the action of an external field, but this also brings many problems to the development of large-scale liquid crystal devices, such as poor mechanical prope...

Claims

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Application Information

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IPC IPC(8): C09K19/38C09K19/02C08F120/34C08F120/30C08F220/34C08F220/36C08F212/08
CPCC08F120/30C08F120/34C08F220/34C09K19/02C09K19/3852C08F212/08C08F220/36
Inventor 张海良赵建航袁勇杰黎金娣
Owner XIANGTAN UNIV
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