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Method for preparing alginate liquid crystalline phases

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

Active Publication Date: 2015-08-26
QINGDAO UNIV
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  • 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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  • Method for preparing alginate liquid crystalline phases

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Effect test

Embodiment 1

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

Embodiment 2

[0026] Weigh 25.2g of sodium bicarbonate into 100ml of distilled water, stir until it is fully dissolved to obtain a 3mol / L sodium hydrogen nitrate 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 50°C water bath for 5 hours; the prepared sodium alginate / sodium hydrogen nitrate mixed solution was centrifuged at rest, and the solution was observed to be divided into upper and lower phases. The funnel separates the lower liquid crystal phase.

Embodiment 3

[0028] Weigh 72g of sodium bisulfate into 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 in a 60℃ water bath and stir for 2 hours; After 4 hours of centrifugation, the prepared sodium alginate / sodium bisulfate mixed solution will be 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 method for preparing alginate liquid crystalline phases, which comprises following steps: electrolyte is added into distilled water firstly, is fully stirred to completely dissolve, and is prepared to be a certain concentration of electrolyte solution. A certain amount of sodium alginate powder is weighted to be added into the prepared electrolyte solution, the mass percentage of alginate is 0.2%-70% in the mixed solution, and the mixed solution is stirred in room temperature for 5 min-20 h, then is stirred in a 20-70 DEG C water bath kettle for 5min-10h, phases are separated for 1-12h, the mixed solution can be separated to be an upper and a lower phases, and the lower phase is taken out to observe in an orthogonal polarization microscope to have an obvious bright field, and has strong anisotropy. The method for preparing alginate liquid crystalline phases forms liquid crystalline phases by utilizing the alginate and electrolytes to affect with each other, is simple and convenient, and enables anisotropy of prepared liquid crystalline phases to be obvious.

Description

Technical field [0001] The invention relates to a method for preparing an alginate liquid crystal phase, belonging to the field of polymer liquid crystals. Background technique [0002] Sodium alginate is a natural polysaccharide extracted from brown algae. It is made of α -L-mannuronic acid (M unit) and β -D-guluronic acid (G unit) is a copolymer composed of GM, MM and GG fragments in different proportions connected by 1,4-glycosidic bonds. Because of its excellent properties, sodium alginate is widely used in food, medicine, textile, printing and dyeing, papermaking, daily chemical products and other products as thickener, emulsifier, stabilizer, adhesive, sizing agent, etc., and is processed and utilized It is bound to bring higher economic value. [0003] In recent years, the liquid crystal of natural polysaccharides has become a research hotspot in the field of polymer research. Scientists have found that many natural polysaccharides have liquid crystal phases, such as cellul...

Claims

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Application Information

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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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