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Preparation of chitin lyotropic liquid crystal

A technology of lyotropic liquid crystals and chitin, which is applied in the direction of liquid crystal materials, chemical instruments and methods, and bulk chemical production, can solve the problems of unrecyclable solvents, inevitable degradation, and low viscosity, and achieve simple preparation methods and solution systems. Stable and cost-reducing effect

Inactive Publication Date: 2011-04-06
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chitin solution prepared by the above solvents has a relatively low viscosity, dissolves quickly at room temperature or when the temperature rises slowly, and hydrolyzes relatively slowly, but due to the presence of acid, there is inevitably the problem of degradation
In 1977, Austin (U.S. Patent US 4059457) reported a composite solvent composed of amide and lithium chloride, generally N, N-dimethylacetamide (DMA) or N-methyl-2-pyrrolidone (MP) and chlorine Composed of lithium chloride, the commonly used 7% LiCl-MP solvent is to dissolve 35.0g dry LiCl in 500.0ml MP, and 5% LiCl-DMA is to dissolve 25.0g dry LiCl in DMA. Stir overnight at room temperature, and the bottle mouth should be sealed. The MP or DMA used must be distilled once under reduced pressure with a 2cm×50cm Vigreux distillation column in advance. MP will gradually turn yellow when stored, and even inert. The same is true in the gas, which must be distilled under reduced pressure before use, and all solvents cannot be recovered

Method used

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  • Preparation of chitin lyotropic liquid crystal
  • Preparation of chitin lyotropic liquid crystal
  • Preparation of chitin lyotropic liquid crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The ionic liquid 1-allyl-3-methylimidazole hydrochloride (AMIMCl) was placed in a petri dish, placed in a freeze dryer for 24 hours, and then placed in a vacuum oven at 110°C for 24 hours to remove moisture. Pour 1.035g of AMMCl into a 5ml graduated test tube with a stopper in an almost anhydrous environment, add 0.066g of anhydrous LiCl (6wt%), stir evenly and place it in an oven at 100°C for 1 hour until LiCl is completely dissolved to obtain a transparent solution. Weigh 0.034g Chitin (3wt%) was added to the test tube, and after mixing evenly, the test tube was placed in a vacuum oven at 100°C. After 24 hours, samples were taken between two glass slides to form a liquid crystal cell, sealed with wax, and left to stand for 1 hour. Observed under a polarizing microscope at 20°C planar liquid crystal texture, (see figure 1 ), a typical fingerprint-like texture can be observed in local areas (see figure 2 ), both textures are cholesteric liquid crystals.

Embodiment 2

[0029] Place the ionic liquid 1-butyl-3-methylimidazole hydrochloride (BMIMCl) in a petri dish, freeze-dry it in a freeze dryer for 24 hours, and then dry it in a vacuum oven at 110°C for 48 hours in a basically anhydrous environment. Get 1.255g BMMCl and pour it into a 5ml stoppered scale test tube, add 0.081g anhydrous urea (CO(NH 2 ) 2 , 6wt%), stirred evenly and placed in a 110°C oven for 0.5h until the urea was completely dissolved to obtain a transparent solution. Weighed 0.07g chitin (5wt%) and added it to the test tube. After mixing evenly, place the test tube in a 100°C vacuum oven After 24 hours, samples were taken between two glass slides to form a liquid crystal cell, sealed with wax, and left to stand for 1 hour. Planar liquid crystal texture was observed under a polarizing microscope at 20°C (see image 3 ), a typical fingerprint-like texture can be observed in the local area ( Figure 4 ), both textures are cholesteric liquid crystals.

Embodiment 3

[0031] The ionic liquid 1-ethyl-3-methylimidazole bromide (EMIMBr) was placed in a petri dish, placed in a freeze dryer for 24 hours, and then placed in a vacuum oven at 110°C for 24 hours in a vacuum-dried environment. Pour 1.076g of EMIMBr into a 5ml graduated test tube with stopper, add 0.096g of anhydrous LiCl (9wt%), stir evenly, and then place it in an oven at 100°C for 0.5h until LiCl is completely dissolved in the ionic liquid to obtain a transparent solution. Weigh 0.082g Chitin (7wt%) was added to the test tube, and after mixing evenly, the test tube was placed in a vacuum oven at 100°C. After 48h, the sample was taken between two glass slides to form a liquid crystal cell, sealed with wax, and left to stand for 1h, and observed under a polarizing microscope at 20°C. Planar liquid crystal texture (cholesteric phase), a typical fingerprint-like texture can be observed in local areas, and both textures are cholesteric liquid crystals.

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Abstract

The invention provides a method for preparing chitin lyotropic liquid crystal, which relates to a natural polymer material. The invention provides a method for preparing chitin lyotropic liquid crystal which takes ionic liquid as a solvent to dissolve chitin, has optical anisotropy, and can be taken as a spinning stock solution to be applied to the preparation of liquid crystal spinning or liquidcrystal film. The method comprises the following steps: molten ionic liquid is mixed with a dissolution promoting agent under an anhydrous condition and stirred till complete dissolution, so as to obtain a mixed solution; the adding amount of the dissolution promoting agent is 5 to 9 percent of the mass fraction of the ionic liquid; the chitin accounting for 3 to 20 percent of the mass fraction of the ionic liquid is added to the mixed solution; and the chitin and the mixed solution are well mixed and then heated till complete dissolution, so as to obtain the chitin lyotropic liquid crystal as translucent viscous liquid.

Description

technical field [0001] The invention relates to a natural polymer material, in particular to a preparation method of chitin lyotropic liquid crystal. Background technique [0002] Existing synthetic polymer compounds are mainly based on petroleum resources, but as petroleum resources are exploited in large quantities, they will be increasingly depleted within decades. Therefore, polymer scientists have to look for new resources for polymer materials, and the inexhaustible and inexhaustible renewable natural polymers have become the first choice. The total amount of these renewable natural polymers reaches (107-184 )×10 12 t / y. Among the renewable natural polymers, cellulose, starch, chitin, protein, etc. are highly valued by scientific and technological workers in various countries. Among them, chitin is a polysaccharide connected by N-acetyl-2-amino-D-glucose in the form of β-1,4 glycosidic bonds. The annual biosynthesis of chitin is 10 billion tons, and it is the secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/11C08L5/08C09K19/38C09K19/52
CPCY02P20/54
Inventor 董炎明曾志群
Owner XIAMEN UNIV
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