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A kind of preparation method of alginate liquid crystal phase

A technology of liquid crystal phase and sodium alginate is applied in the field of polymer liquid crystal, which can solve the problems of rigid molecular chain length and difficulty in forming liquid crystal, and achieve the effects of obvious bright field, low cost and simple preparation process.

Active Publication Date: 2018-07-13
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because sodium alginate has the characteristics of wide molecular weight distribution, long molecular chain and poor rigidity, and alternate arrangement of molecular chain G segments and M segments, it is difficult to form a liquid crystal phase, so the preparation method of sodium alginate liquid crystal and its material Research has rarely reported

Method used

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  • A kind of preparation method of alginate liquid crystal phase

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Effect test

Embodiment 1

[0024] Weigh 11.7g of sodium chloride and add it to 100ml of distilled water, stir until fully dissolved to obtain a 2mol / L sodium chloride salt solution; then add 2g of sodium alginate powder to the sodium chloride solution while stirring, and then dissolve the above solution Stir at room temperature for 20 hours, then put it into a water bath at 70°C and stir for 5 minutes; centrifuge the prepared sodium alginate / sodium chloride mixed solution for 3 hours, and observe that the solution is divided into upper and lower phases, which are separated by a separatory funnel out of the lower liquid crystal phase.

Embodiment 2

[0026] Weigh 25.2g of sodium bicarbonate and add it to 100ml of distilled water, stir until fully dissolved to obtain a 3mol / L sodium binitrate salt solution; then add 0.2g of sodium alginate powder to the sodium bicarbonate solution while stirring, and then add the above The solution was stirred at room temperature for 5 minutes and then placed in a water bath at 50°C and stirred for 5 hours; the prepared sodium alginate / sodium hydrogen nitrate mixed solution was left to stand and centrifuged, and it was observed that the solution was divided into upper and lower phases. The lower liquid crystal phase was separated by a funnel.

Embodiment 3

[0028] Weigh 72g of sodium bisulfate and add it to 100ml of distilled water, stir until fully dissolved to obtain a 6mol / L sodium bisulfate solution; then add 20g of sodium alginate powder to the sodium bisulfate solution while stirring, and then bring the above solution to room temperature After stirring for 12 hours, put it into a water bath at 60°C and stir for 2 hours; centrifuge the prepared sodium alginate / sodium bisulfate mixed solution for 4 hours, and it will be observed that the solution is divided into upper and lower phases, which are separated by a separatory funnel. lower liquid crystal phase.

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Abstract

The invention discloses a preparation method of an alginate liquid crystal phase, which comprises the following steps: first, adding an electrolyte into distilled water, fully stirring until completely dissolved, and preparing an electrolyte solution with a certain concentration; weighing a certain amount of sodium alginate powder, Add to the prepared electrolyte solution, the mixed solution of alginate mass fraction is 0.2%-70%, stir at room temperature for 5 min-20 h, then stir in 20-70°C water bath for 5 min-10 h, pass After 1-12 hours of phase separation, the solution will be divided into two obvious upper and lower phases; the lower phase is taken out, and an obvious bright field exists under an orthogonal bias microscope, which has strong anisotropy. The invention utilizes the interaction between sodium alginate and electrolyte to form a liquid crystal phase, the method is simple, and the obtained liquid crystal has obvious anisotropy.

Description

technical field [0001] The invention relates to a preparation method of an alginate liquid crystal phase, which belongs to the field of polymer liquid crystals. Background technique [0002] Sodium alginate is a natural polysaccharide extracted from brown algae. α -L-mannuronic acid (M unit) and β - Copolymers of D-guluronic acid (G units) linked by 1,4-glycosidic bonds and composed of GM, MM and GG segments in different proportions. Sodium alginate is widely used in food, medicine, textile, printing and dyeing, papermaking, daily chemicals and other products as thickener, emulsifier, stabilizer, adhesive, sizing agent, etc. because of its excellent performance, it is processed and utilized It is bound to bring higher economic value. [0003] In recent years, liquid crystals of natural polysaccharides have become a research hotspot in the field of polymer research. Scientists have found that many natural polysaccharides have liquid crystal phases, such as cellulose and it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08J3/05
Inventor 隋坤艳谭业强张庆旭臧冰王凤夏延致
Owner QINGDAO UNIV
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