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A kind of polyionic liquid/cellulose nanocrystal composite and preparation method thereof

A technology of polyionic liquid and cellulose, which is applied in the field of polyionic liquid/cellulose nanocrystal composite and its preparation, which achieves the effects of simple production method, expanded application field, and avoiding chemical structure damage

Active Publication Date: 2018-08-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a polyionic liquid / cellulose nanocrystal composite and its preparation method. The present invention obtains a polyionic liquid that can have Cellulose nanocrystals with better dispersibility; the preparation method of the present invention is simple, avoiding the problems of chemical structure damage, cumbersome operation and low yield caused by chemical grafting modification, and expanding the application field of cellulose nanocrystals , to maximize the application value of cellulose nanocrystals

Method used

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  • A kind of polyionic liquid/cellulose nanocrystal composite and preparation method thereof
  • A kind of polyionic liquid/cellulose nanocrystal composite and preparation method thereof
  • A kind of polyionic liquid/cellulose nanocrystal composite and preparation method thereof

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Effect test

Embodiment 1

[0047] A polyionic liquid / cellulose nanocrystal composite, the composite ratio of cellulose nanocrystal to polyionic liquid PIL-DBS is 1.2.

[0048] The structural formula of the above polyionic liquid PIL-DBS is shown in formula (3), wherein n is 22.

[0049] The preparation method of above-mentioned polyionic liquid / cellulose nanocrystal compound is:

[0050] Step a: Carry out water and oxygen removal treatment on a 150 ml three-necked flask. The water and oxygen removal treatment is as follows: fully dry the clean 150 ml three-necked flask at 90° C. for 3 hours, take it out and cool it to room temperature, and inject nitrogen gas ;

[0051] Step b: under nitrogen protection, add 29.60 g of phthalic anhydride and 50 ml of N,N-dimethylformamide into a three-necked flask, and stir to form a uniform solution;

[0052] Step c: Add 0.13 grams of ethylene glycol (accounting for 1% by mole of phthalic anhydride) to the solution obtained in step b under nitrogen protection, and st...

Embodiment 2

[0061] A polyionic liquid / cellulose nanocrystal composite, the composite ratio of cellulose nanocrystal and polyionic liquid PIL-DBS is 1.5.

[0062] The structural formula of the above polyionic liquid PIL-DBS is shown in formula (3), wherein n is 17.

[0063] The preparation method of above-mentioned polyionic liquid / cellulose nanocrystal compound is:

[0064] Step a: Carry out water and oxygen removal treatment on a 150 ml three-necked flask. The water and oxygen removal treatment is as follows: fully dry the clean 150 ml three-necked flask at 90° C. for 3 hours, take it out and cool it to room temperature, and inject nitrogen gas ;

[0065] Step b: under nitrogen protection, add 28.00 g of phthalic anhydride and 50 ml of N,N-dimethylformamide into the three-necked flask, and stir to form a uniform solution;

[0066] Step c: add 0.15 grams of ethylene glycol (accounting for 1.2% mole percent of phthalic anhydride) to the solution obtained in step b under nitrogen protecti...

Embodiment 3

[0075] A polyionic liquid / cellulose nanocrystal composite, the composite ratio of cellulose nanocrystal to polyionic liquid PIL-DBS is 1.8.

[0076] The above polyionic liquid PIL-DBS has a structural formula as shown in formula (3), wherein n is 24.

[0077] The preparation method of above-mentioned polyionic liquid / cellulose nanocrystal compound is:

[0078] Step a: Carry out water and oxygen removal treatment on a 150 ml three-necked flask. The water and oxygen removal treatment is as follows: fully dry the clean 150 ml three-necked flask at 90° C. for 3 hours, take it out and cool it to room temperature, and inject nitrogen gas ;

[0079] Step b: under nitrogen protection, add 25.5 grams of phthalic anhydride and 50 milliliters of N,N-dimethylformamide into a three-necked flask, and stir to form a uniform solution;

[0080] Step c: Add 0.2 grams of ethylene glycol (1.8% mole percent of phthalic anhydride) to the solution obtained in step b under nitrogen protection, and ...

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Abstract

The invention relates to a polyion liquid and cellulose nanocrystal compound and a preparation method thereof. The compounding ratio of cellulose nanocrystals to polyion liquid in the polyion liquid and cellulose nanocrystal compound is (1.20-1.82):1, wherein the polyion liquid is PIL-DBS. The preparation method comprises the steps that the polyion liquid PIL-DBS is dissolved in an organic solvent and then mixed with an aqueous dispersion of the cellulose nanocrystals, and oscillation and ultrasonic treatment are conducted till phase splitting is achieved; an upper aqueous phase in a two-phase product subjected to phase splitting is poured and separated, the organic solvent in the lower organic phase is removed, and the polyion liquid and cellulose nanocrystal compound is obtained. According to the polyion liquid and cellulose nanocrystal compound and the preparation method thereof, a surface non-covalent modification method is adopted for modifying the cellulose nanocrystals, and therefore the compound can be stably dispersed in non-polar organic solvents of chloroform and the like, and application of the cellulose nanocrystals in the field of nano composite materials is expanded.

Description

technical field [0001] The invention belongs to the field of cellulose nanocrystal composite material and its preparation, in particular to a polyionic liquid / cellulose nanocrystal composite and its preparation method. Background technique [0002] Cellulose nanocrystals are rigid rod-shaped cellulose with a size of tens to hundreds of nanometers. Its diameter is about 20-100nm and its aspect ratio is about 10:1. It has high purity, high crystallinity, and Young's mode. High volume and high surface tension and other characteristics. The nanoscale effect of cellulose nanocrystals makes them have unique geometric shapes, mechanical properties, surface effects, and liquid crystallinity. Therefore, it is often used as a natural high-strength reinforcing agent in polymer nanocomposites and other fields. Chinese patent 201310410925.9 reports a cellulose nano-whisker (CNW) composite two-component terpene-based waterborne polyurethane and its preparation method. The surface active...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/04C08L67/02C08G63/91C08G63/682
CPCC08G63/6826C08G63/916C08L1/04C08L67/02
Inventor 夏于旻黄铄涵王心航郑拓胡紫东钟晓慧付兴柱马腾娇
Owner DONGHUA UNIV
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