A cellulose hybrid, preparation method and its application

A cellulose mixed ester and cellulose technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as uncontrollable product structure, environmental pollution, severe degradation of cellulose, etc., and achieve free volume fraction Large, high mechanical strength, high solubility effect

Active Publication Date: 2017-08-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method often causes serious degradation of cellulose, uncontrollable product structure, and environmental pollution.

Method used

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  • A cellulose hybrid, preparation method and its application
  • A cellulose hybrid, preparation method and its application
  • A cellulose hybrid, preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The synthetic method of adamantane cellulose acetate mixed ester comprises the following steps:

[0038] a. Add 2 g of cellulose to 48 g of allylmethylimidazolium chloride ionic liquid, and mechanically stir at 80° C. for 2 hours to dissolve the cellulose; the mass concentration of the cellulose is 4%.

[0039] b. Add 3.4 g of co-solvent pyridine and stir for 5 minutes. The molar ratio of pyridine to anhydroglucose units in cellulose is 3.5:1; add acetic anhydride and adamantanecarbonyl chloride at the same time, stir mechanically for 2 hours, and maintain the temperature at 80°C; adamantine The molar ratio of alkanoyl chloride and acetic anhydride to anhydroglucose units in cellulose is 1:1

[0040] c. Add ethanol to precipitate the product, vacuum filter and wash.

[0041] The precipitate obtained in step c was purified with DMSO, washed with water, filtered under reduced pressure, and dried.

[0042] According to NMR calculation, the total substitution degree of the ...

Embodiment 2

[0044] Same as Example 1, the difference is that the ionic liquid is butylmethylimidazole acetate ionic liquid, the co-solvent is imidazole, the molar ratio of imidazole to the anhydroglucose unit in the cellulose is 3:1, first add adamantane carboxylic acid chloride, stir After 1 hour, add acetic anhydride and stir mechanically for 1 hour. The molar ratio of acetic anhydride and adamantanecarbonyl chloride to the anhydroglucose unit in the cellulose is 1:1, and the precipitating agent is isopropanol. The total substitution degree of the obtained adamantanecarboxylate mixed ester was 0.79, the substitution degree of the acetate group was 0.63, and the substitution degree of the adamantanecarboxylate group was 0.16.

Embodiment 3

[0046] Same as Example 1, the difference is that the ionic liquid is ethylmethylimidazolium chloride ionic liquid, the co-solvent is ethylenediamine, the molar ratio of ethylenediamine to the anhydroglucose unit in the cellulose is 3:1, first add acetic anhydride , after stirring for 1h, add adamantanecarbonyl chloride again, mechanically stir 1h, the mol ratio of adamantanecarbonyl chloride and the anhydroglucose unit in the cellulose is 1:1, and the mol ratio of the anhydroglucose unit in the acetic anhydride and the cellulose is 2: 1. The total degree of substitution of the obtained mixed cellulose acetate adamantane carboxylate was 1.68, the degree of substitution of the acetate group was 1.56, and the degree of substitution of the adamantane carboxylate was 0.12.

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Abstract

The invention discloses a cellulose mixed ester, which is a cellulose acetate adamantane carboxylate mixed ester having an acetate group and an adamantane carboxylate group, and its structural formula is: wherein, the degree of substitution of the acetate group is greater than 0 to 3, the degree of substitution of the adamantanecarboxylic acid group is greater than 0 to 2.25. The above-mentioned cellulose mixed ester introduces acetate groups and adamantane carboxylate groups into its cellulose main chain, and the material has high solubility, good film-forming properties, and a controllable degree of substitution. The cellulose mixed ester can be synthesized by one-step method to obtain adamantane formate cellulose mixed ester, and the synthesis is simple, efficient and stable.

Description

technical field [0001] The invention relates to the field of cellulose synthesis, in particular to a cellulose mixed ester. The present invention also relates to the preparation method and application of the above-mentioned cellulose mixed ester. Background technique [0002] Cellulose is a polymer glucan made of D-glucose connected by β-1,4 glycosidic bonds. It is the main component of plant cell walls and the most abundant natural polymer in nature. my country's agricultural and forestry biomass has a connotation of more than 18 billion tons. The annual output of crop straw, forest stubble and wood processing residues is 700-1000 million tons, and 300-400 million tons of cellulose can be produced. Its resource advantages are obvious. Moreover, the cellulose main chain contains a large number of active hydroxyl groups, which provide active points for the derivatization reaction, and a wide variety of cellulose derivative products are obtained. Among them, in order to furt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B3/16B01D71/18
Inventor 张军陈婧武进张金明
Owner INST OF CHEM CHINESE ACAD OF SCI
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