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Modified cellulose nanometer crystal and preparation method thereof

A technology of nanocrystals and cellulose, applied in the field of modified cellulose nanocrystals and its preparation, can solve the problems of poor thermal stability and poor compatibility, and achieve the effect of improving thermal stability

Inactive Publication Date: 2015-12-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there are more sulfuric acid groups on the surface of cellulose nanocrystals, their thermal stability is poor, and the hydroxyl groups on the surface make the nanoparticles have strong polarity and water absorption, which makes cellulose nanoparticles and many non- Poor compatibility between polar materials

Method used

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  • Modified cellulose nanometer crystal and preparation method thereof
  • Modified cellulose nanometer crystal and preparation method thereof
  • Modified cellulose nanometer crystal and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A modified cellulose nanocrystal and a preparation method thereof, the formula ratio is in parts by weight, and the implementation steps are as follows:

[0028] (1) Disperse 1 part of cellulose nanocrystals into a mixed solution containing triethylamine and N'N-dimethylformamide, add 10 parts of 2-bromoisobutyryl bromide dropwise under nitrogen protection, and React at 50°C for 12 hours; after the reaction, filter and extract to obtain cellulose nanocrystalline bromoisobutyrate;

[0029] (2) Dissolve 20 parts of styrene and 0.5 part of ethyl bromoisobutyrate into anisole, and under nitrogen protection, add 0.1 part of cuprous bromide and 0.2 part of cellulose nanocrystal bromoisobutyrate For the ester, add 0.5 parts of N,N,N,N',N'-pentamethyldivinyltriamine to the reaction system, and react at 80°C for 8 hours; after the reaction, filter, extract, and dry, The modified cellulose nanocrystals were obtained.

Embodiment 2

[0031] A modified cellulose nanocrystal and a preparation method thereof, the formula ratio is in parts by weight, and the implementation steps are as follows:

[0032] (1) Disperse 2 parts of cellulose nanocrystals into a mixed solution containing triethylamine and N'N-dimethylformamide. Under nitrogen protection, add 20 parts of 2-bromoisobutyryl bromide dropwise, and React at 60°C for 18 hours; after the reaction, filter and extract to obtain cellulose nanocrystalline bromoisobutyrate;

[0033] (2) 30 parts of styrene and 0.6 part of ethyl bromoisobutyrate are dissolved in anisole, and under nitrogen protection, 0.2 part of cuprous bromide and 0.3 part of cellulose nanocrystal bromoisobutyrate are added For the ester, add 0.6 parts of N,N,N,N',N'-pentamethyldivinyltriamine to the reaction system, and react at 90°C for 10 hours; after the reaction, filter, extract, and dry, The modified cellulose nanocrystals were obtained.

Embodiment 3

[0035] A modified cellulose nanocrystal and a preparation method thereof, the formula ratio is in parts by weight, and the implementation steps are as follows:

[0036] (1) Disperse 3 parts of cellulose nanocrystals into a mixed solution containing triethylamine and N'N-dimethylformamide, under nitrogen protection, add 30 parts of 2-bromoisobutyryl bromide dropwise, and React at 70°C for 24 hours; after the reaction, filter and extract to obtain cellulose nanocrystalline bromoisobutyrate;

[0037] (2) 50 parts of styrene and 0.7 part of ethyl bromoisobutyrate are dissolved in anisole, and under nitrogen protection, 0.3 part of cuprous bromide and 0.5 part of cellulose nanocrystal bromoisobutyrate are added For the ester, add 0.7 parts of N,N,N,N',N'-pentamethyldivinyltriamine to the reaction system, and react at 100°C for 12 hours; after the reaction, filter, extract, and dry, The modified cellulose nanocrystals were obtained.

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Abstract

The present invention relates to a modified cellulose nanometer crystal and a preparation method thereof, and belongs to the technical field of material modification and use. The preparation method comprises: (1) carry out a reaction of 2-bromo isobutyryl bromide and a cellulose nanometer crystal by using an esterification reaction so as to obtain cellulose nanometer crystal bromo isobutyrate; and (2) grafting a monomer styrene onto the cellulose nanometer crystal surface by using an atom transfer free radical polymerization technology under the catalysis effect of cuprous bromide under assisted initiation of the bromo isobutyrate so as to prepare a series of the cellulose nanometer crystals with different modification effects. According to the present invention, the concentrations of the cellulose nanometer crystal and the monomer and the use amounts of the initiator and the catalyst are changed to adjust the grafting density of the polystyrene on the cellulose nanometer crystal surface and the grafting chain length so as to improve the thermal stability and the hydrophobicity of the cellulose nanometer crystal and achieve the modification effect meeting the material application requirements, such that the modified cellulose nanometer crystal is suitable for preparing the organic composite material.

Description

technical field [0001] The invention belongs to the technical field of modification and utilization of natural polymer materials. Specifically, it relates to a modified cellulose nanocrystal and a preparation method thereof. Background technique [0002] Biomass materials are renewable, biodegradable and abundant green materials. With the development of society, the problem of resources and energy is becoming more and more serious, so biomass materials have attracted great attention from enterprises and researchers. Since the 1980s, people have begun to study and master the extraction method of cellulose nanocrystals (CNC), which is the reinforcing unit of natural cellulose such as wood at the nanoscale. [0003] At present, the most mainstream method for preparing cellulose nanocrystals is sulfuric acid hydrolysis. The surface of the cellulose nanocrystals produced by sulfuric acid hydrolysis has many sulfate groups. After these sulfate ester groups are ionized, the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F212/08C08F220/14
Inventor 蒋学尹园园田秀枝王鸿博高卫东
Owner JIANGNAN UNIV
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