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Modified nanocellulose and preparation method thereof

A technology of nanocellulose and microcrystalline cellulose, which is applied in the field of modified nanocellulose and its preparation, and can solve poor compatibility, poor mechanical strength, poor transparency, poor compatibility between nanocellulose and organic materials, etc. problems, to achieve the effect of improving compatibility

Inactive Publication Date: 2016-07-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The hydroxyl groups on the surface of nanocellulose make the nanoparticles have strong polarity and water absorption, which makes the compatibility between cellulose nanoparticles and many non-polar materials poor
When nanocellulose is used as the reinforcing phase of nanocomposite materials, the compatibility between nanocellulose and organic materials is poor, which leads to poor mechanical strength and transparency of the prepared composite materials. Cellulose is modified to improve the hydrophobicity of nanocellulose, thereby improving the compatibility between nanocellulose and organic materials, and obtaining nanocomposites with excellent performance, thereby expanding the scope of use of nanocellulose

Method used

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  • Modified nanocellulose and preparation method thereof
  • Modified nanocellulose and preparation method thereof
  • Modified nanocellulose and preparation method thereof

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Effect test

Embodiment 1

[0026] A modified nanocellulose and a preparation method thereof, the formula ratio is calculated in parts by weight, and the implementation steps are as follows:

[0027] (1) Disperse 1 part of microcrystalline cellulose into a certain amount of water, add 10 parts of NaBr and 0.1 part of TEMPO, add 0.1 part of NaClO after NaBr and TEMPO are dissolved, and react at 25°C for 1 hour. After the reaction, centrifuge and dialyze to obtain oxidized microcrystalline cellulose. Process the oxidized microcrystalline cellulose with an ultrasonic pulverizer to obtain oxidized nanocellulose;

[0028] (2) A certain amount of oxidized nanocellulose was mixed with dodecyltrimethylammonium chloride (DTAC), stirred at 50° C. for 3 hours, centrifuged, and freeze-dried. The oxidized nanocellulose modified by cationic adsorption was obtained.

Embodiment 2

[0030] A modified nanocellulose and a preparation method thereof, the formula ratio is calculated in parts by weight, and the implementation steps are as follows:

[0031] (1) Disperse 2 parts of microcrystalline cellulose into a certain amount of water, add 20 parts of NaBr and 0.2 parts of TEMPO, add 0.2 parts of NaClO after NaBr and TEMPO are dissolved, and react at 25°C for 2 hours. After the reaction, centrifuge and dialyze to obtain oxidized microcrystalline cellulose. Process the oxidized microcrystalline cellulose with an ultrasonic pulverizer to obtain oxidized nanocellulose;

[0032] (2) A certain amount of oxidized nanocellulose tetradecyltrimethylammonium chloride (TTAC) was mixed, stirred at 50° C. for 3 hours, centrifuged, and freeze-dried. The oxidized nanocellulose modified by cationic adsorption was obtained.

Embodiment 3

[0034] A modified nanocellulose and a preparation method thereof, the formula ratio is calculated in parts by weight, and the implementation steps are as follows:

[0035] (1) Disperse 3 parts of microcrystalline cellulose into a certain amount of water, add 30 parts of NaBr and 0.3 part of TEMPO, add 0.3 part of NaClO after NaBr and TEMPO are dissolved, and react at 25°C for 3 hours. After the reaction, centrifuge and dialyze to obtain oxidized microcrystalline cellulose. Process the oxidized microcrystalline cellulose with an ultrasonic pulverizer to obtain oxidized nanocellulose;

[0036] (2) A certain amount of oxidized nanocellulose was mixed with hexadecyltrimethylammonium chloride (HTAC), stirred at 50° C. for 3 hours, centrifuged, and freeze-dried. The oxidized nanocellulose modified by cationic adsorption was obtained.

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Abstract

The invention discloses modified nanocellulose and a preparation method thereof, and belongs to the technical field of modification of high polymer materials. The preparation method comprises two steps: (1) preparing oxidized nanocellulose by adopting a TEMPO oxidation and ultrasonic grinding combined method; (2) carrying out adsorbent modification on the prepared oxidized nanocellulose by adopting cationic surface active agents with different carbon chain lengths so as to obtain nanocellulose with different modification effects. The preparation method is characterized in that the nanocellulose with different modification effects is obtained through adsorbing the cationic surface active agents with different carbon chain lengths on the prepared nanocellulose with different oxidation effects, so that the modification effects according with the material application requirements are achieved and the preparation method is more beneficial to preparation of organic composite materials.

Description

technical field [0001] The invention belongs to the technical field of modification of natural polymer materials. Specifically, it is a modified nano-cellulose and a preparation method thereof. Background technique [0002] With the development of society, the problem of resources and energy is becoming more and more serious, and more and more attention is paid to biomass materials. Nanocellulose has a high Young's modulus (138GPa), a huge specific surface area (hundreds of m 2 / g), low cost, easy availability of raw materials, and degradability have become one of the most concerned biomass materials. Nanocellulose is an ideal choice for preparing the reinforcement phase of nanocomposites due to its excellent mechanical properties. [0003] The hydroxyl groups on the surface of nanocellulose make the nanoparticles have strong polarity and water absorption, which makes the compatibility between cellulose nanoparticles and many non-polar materials poor. When nanocellulose i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02C08L1/04C08K5/19
CPCC08B15/02C08K5/19
Inventor 蒋学尹园园田秀枝王鸿博高卫东
Owner JIANGNAN UNIV