A kind of preparation method of nanocellulose-based unimolecular micelles

A technology of nanocellulose and molecular glue, applied in the field of functional polymer nanomaterials, to achieve the effect of polymerizing a wide range of monomers

Active Publication Date: 2020-01-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

RAFT polymerization has the advantages of good controllability, wide selection of applicable monomers, and mild reaction conditions. However, there are few reports on the preparation of nanocellulose-based unimolecular micelles in water by using RAFT soap-free emulsion polymerization technology.

Method used

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  • A kind of preparation method of nanocellulose-based unimolecular micelles

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preparation example Construction

[0031] The preparation method of nanocellulose-based unimolecular micelles of the present invention is specifically implemented according to the following steps:

[0032] Step 1, weighing raw materials, 4,4'-azo (4-cyanovaleric acid), hydrophobic monomers, deionized water, and nanocellulose grafted with hydrophilic macromolecular RAFT reagents;

[0033] Wherein, the mass ratio of 4,4'-azo (4-cyanovaleric acid) to the hydrophobic monomer is 1:100-300;

[0034] The mass ratio of 4,4'-azo (4-cyanovaleric acid) to ionized water is 1:1000-2000;

[0035] The mass ratio of 4,4'-azo (4-cyanovaleric acid) to nanocellulose grafted and modified by hydrophilic macromolecular RAFT reagent is 1:100-300;

[0036] Wherein, the hydrophobic monomer is butyl acrylate, hexafluorobutyl acrylate, styrene or methyl methacrylate;

[0037] The nanocellulose grafted and modified by the hydrophilic macromolecule RAFT agent is specifically prepared according to the following steps:

[0038] Step 1. We...

Embodiment 1

[0053] According to the mass ratio of 1:100:1000:100, weigh 4,4′-azo(4-cyanovaleric acid), butyl acrylate, deionized water, and hydrophilic macromolecule RAFT reagent polyacrylic acid grafted modification. properties of nanocellulose; the weighed modified nanocellulose is dissolved in water, and then butyl acrylate monomer is added to form a mixture. After ultrasonically dispersing the weighed initiator and mixture, add them to a three-necked flask equipped with magnetic stirring, a reflux condenser, and an air guide tube, and place the three-necked flask in a water bath, and pass argon gas into the three-necked flask through the air guide tube for 10 minutes. , after raising the temperature of the water bath to 70° C., and keeping it warm for 3 hours, the nanocellulose-based unimolecular micelles were obtained after the reaction.

Embodiment 2

[0055] Weigh 4,4′-azo(4-cyanovaleric acid), methyl methacrylate, deionized water, hydrophilic macromolecular RAFT reagent polymethyl Nanocellulose modified by acrylic acid grafting; the weighed hydrophilic macromolecular RAFT agent modified nanocellulose is dissolved in water, and then methyl methacrylate monomer is added to form a mixture. After ultrasonically dispersing the weighed initiator and mixture, add them to a three-necked flask equipped with magnetic stirring, a reflux condenser, and an air guide tube, and place the three-necked flask in a water bath, and pass argon into the three-necked flask through the air guide tube for 30 minutes , after raising the temperature of the water bath to 85° C., and keeping it warm for 6 hours, the nanocellulose-based unimolecular micelles were obtained after the reaction.

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Abstract

The invention discloses a preparation method of a nano cellulose-based monomolecular micelle. The preparation method specifically comprises the following steps: step I, weighing raw materials which specifically comprise 4,4'-azo(4-cyanovaleric acid), a hydrophobic monomer, deionized water and hydrophilic macromolecular RAFT reagent-grafted modified nano-celluloses; step II, preparing the nano-cellulose based monomolecular micelle by utilizing the 4,4'-azo (4-cyanovaleric acid), the hydrophobic monomer, the deionized water and the hydrophilic macromolecular RAFT reagent-grafted modified nano-celluloses weighed in the step I. The micelle has a core-shell structure, an inner core consists of the nano-celluloses and a hydrophobic chain segment, and an outer layer is a hydrophilic chain segment; the nano cellulose-based monomolecular micelle has the characteristics of stability, narrow particle size distribution and the like.

Description

technical field [0001] The invention belongs to the field of functional macromolecule nanomaterials, and in particular relates to a preparation method of nanocellulose-based unimolecular micelles. Background technique [0002] Nanocellulose is a one-dimensional product at the nanometer level obtained by decomposing the amorphous region of cellulose through catalytic hydrolysis or enzymatic hydrolysis. Therefore, it not only retains many properties of natural polymer materials, but also has Light weight, high strength, large surface area, high Young's modulus, high crystallinity and high transparency, etc., and compared with many inorganic nanomaterials, it has significant advantages, such as: biodegradability, sustainable Reproducibility and biocompatibility. However, due to the abundant hydroxyl groups on the surface of nanocellulose and its high polarity, it is difficult to disperse uniformly in low-polarity solvents and matrices, which limits its application. By chemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/18
CPCC08F285/00C08F2438/03C08F220/1804
Inventor 周建华姚红涛马建中
Owner SHAANXI UNIV OF SCI & TECH
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