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Method for grafting graphene oxide on biphenyl thermotropic liquid crystal compound

A liquid crystal compound and biphenyl type technology, applied in the field of material chemistry, can solve the problems of complex operation process, difficulty in large-scale production and application, and high cost, and achieve the effects of wide source of raw materials, easy operation, and good compatibility

Active Publication Date: 2012-08-01
福州乐道知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are various preparation methods of graphene / polymer-based composite materials, but most of them have complicated operation process, pollution phenomenon, high cost, and it is difficult to produce and apply on a large scale in industry, and in biphenyl type thermotropic liquid crystal compound The concept of grafting graphene oxide on has never been used either

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix 2 grams of sodium hydroxide and 40ml of absolute ethanol, stir magnetically until the sodium hydroxide is completely dissolved, then add 3 grams of 4,4'-p-hydroxybiphenol, react for 20 minutes, add 8 grams of chloroethanol , continue to react at 70°C for 20 hours. After the reaction is over, use a large amount of water to precipitate the product, filter it under reduced pressure, wash the product three times with absolute ethanol, and dry it to obtain a white powder, which is 4,4'-bis(β- Hydroxyethoxy) biphenyl (BP 2 );

[0023] (2) Mix 1 gram of sodium hydroxide with 2 ml of deionized water, and stir magnetically until the sodium hydroxide is completely dissolved;

[0024] (3) 5 grams of 4,4'-di(β-hydroxyethoxy)biphenyl (BP) prepared in step (1) 2 ) was dissolved in 30mlN, N-dimethylformamide (DMF), then mixed with the product obtained in step (2), and reacted at 90°C for 2 hours; then added 10g of epichlorohydrin and 0.03g of tetrabutylammonium bromide , co...

Embodiment 2

[0029] (1) with step (1) in embodiment 1;

[0030] (2) with step (2) in embodiment 1;

[0031] (3) with step (3) in embodiment 1;

[0032] (4) with step (4) in embodiment 1;

[0033] (5) Take 10ml of the graphene oxide mixed solution dispersed by ultrasonic in step (4) and place it in a three-necked flask with a stirrer, a thermometer and a condenser, and add 6ml of SOCl dropwise 2 , react at 80°C for 6 hours;

[0034] (6) 15 grams of the biphenyl type liquid crystal compound prepared in step (3) were dissolved in 60 ml of N,N-dimethylformamide (DMF), then mixed with the product obtained in step (5), and reacted at 80° C. for 6 hours, After the reaction is over, use a large amount of water to precipitate the product, filter it under reduced pressure, wash the product three times with absolute ethanol, and dry it to obtain a gray-black product, which is a biphenyl liquid crystal compound grafted graphite oxide with an epoxy group at the end. alkene;

Embodiment 3

[0036] (1) with step (1) in embodiment 1;

[0037] (2) with step (2) in embodiment 1;

[0038] (3) with step (3) in embodiment 1;

[0039] (4) with step (4) in embodiment 1;

[0040] (5) Take 10ml of the graphene oxide mixed solution dispersed by ultrasonic in step (4) and place it in a three-necked flask with a stirrer, a thermometer and a condenser, and add 8ml of SOCl dropwise 2 , react at 80°C for 6 hours;

[0041] (6) Dissolving 20 grams of the biphenyl type liquid crystal compound prepared in step (3) in 60 ml of N,N-dimethylformamide (DMF), then mixed with the product obtained in step (5), reacted at 80°C for 6 hours, After the reaction is over, use a large amount of water to precipitate the product, filter it under reduced pressure, wash the product three times with absolute ethanol, and dry it to obtain a gray-black product, which is a biphenyl liquid crystal compound grafted graphite oxide with an epoxy group at the end. alkene.

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Abstract

The invention discloses a method for grafting graphene oxide on a biphenyl thermotropic liquid crystal compound. The method comprises the following steps of: dissolving sodium hydroxide in absolute ethanol, adding 4,4'-p-hydroxyl biphenyl diphenol for reacting, adding ethanol, and continuing to react to obtain 4,4'-bis(beta-hydroxyethoxy)biphenyl(BP2); dissolving the sodium hydroxide in deionized water, dissolving the BP2 in N,N-dimethylformamide (DMF), reacting at the temperature of between 70 and 120 DEG C for 1 to 5 hours, and adding epichlorohydrin and tetrabutylammonium bromide, continuously reacting to obtain a biphenyl liquid crystal compound; and dripping SOCl2 in a graphene oxide mixed solution formed by ultrasonic wave dispersion for reacting, dissolving the biphenyl liquid crystal compound in the DMF, and mixing and continuously reacting to obtain a graphene oxide-grafted biphenyl liquid crystal compound. The preparation method is simple, pollution-free and low in cost, raw materials are wide in sources, and large-scale industrial production is facilitated.

Description

Technical field: [0001] The technical field of the invention belongs to the field of material chemistry, and in particular relates to a method for grafting graphene oxide with a biphenyl type thermotropic liquid crystal compound. Background technique: [0002] Graphene is the strongest substance known to man, harder than diamond, 100 times stronger than the best steel in the world, graphene Young's modulus can reach 11000GPa, fracture strength can reach 125GPa, and thermal conductivity can 5000W / (m K), specific surface area up to 2630m 2 / g, and has the properties of perfect quantum tunneling effect, half-integer quantum Hall effect and never-disappearing conductivity. Its series of properties make it a great performance as a high-performance functional filler in the field of polymer composite materials. Appeal. [0003] Thermotropic liquid crystal compound is a new type of high-performance polymer material, which has the characteristics of high modulus, high strength, sel...

Claims

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Application Information

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IPC IPC(8): C09C1/46C09C3/10C08K9/04C08K3/04
Inventor 李善荣陆绍荣徐旭凌日华祁博袁正凯
Owner 福州乐道知识产权运营有限公司
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