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Preparation method of spherical polymer brush with chitosan as core

A technology of polymer brushes and chitosan balls is applied in the field of preparation of spherical polymer brushes to achieve the effect of low cost

Inactive Publication Date: 2018-04-20
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, spherical polymer brushes have spherical silica, spherical polystyrene, carbon spheres, etc. as cores, but the synthetic method of this patent with chitosan as the core has not yet been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5.6g of 4,4'-azo (4-cyanovaleric acid) and 8g of phosphorus pentachloride were reacted in dichloromethane to prepare acid chloride, and 0.1g of acid chloride and 10g of chitosan spheres obtained above were prepared in dichloromethane Reaction in methane, the used chitosan balls have a particle size of 20 microns, the product is washed and centrifuged with dichloromethane and ethanol, and finally dried to obtain the chitosan balls loaded with the initiator.

[0023] Take 3g of monomer dimethyl diallyl ammonium chloride, 6g of chitosan balls loaded with initiator, choose water as solvent, temperature 80°C, polymerization time 1h, then carry out Soxhlet extraction of the obtained product with water, After drying, the polymer brush can be obtained. The average molecular weight of the obtained polymer brush is 2000, and the grafting density is 0.1 / nm 2 .

Embodiment 2

[0025] 5.6g of 4,4'-azo (4-cyanovaleric acid) and 8g of phosphorus pentachloride were reacted in dichloromethane to prepare acid chloride, and 0.1g of acid chloride and 2g of chitosan spheres obtained above were prepared in dichloromethane React in methane, the chitosan balls used have a particle size of 0.1 micron, the product is washed and centrifuged with dichloromethane and ethanol, and finally dried to obtain the chitosan balls loaded with the initiator.

[0026] Take 3g of monomer dimethyl diallyl ammonium chloride, 0.2g of chitosan ball loaded with initiator, choose water as solvent, temperature 40℃, polymerization time 24h, then Soxhlet extraction of the obtained product with water , and then dried to obtain a polymer brush. The average molecular weight of the obtained polymer brush is 400,000, and the graft density is 9.9 pieces / nm 2 .

Embodiment 3

[0028] 5.6g of 4,4'-azo (4-cyanovaleric acid) and 8g of phosphorus pentachloride were reacted in dichloromethane to prepare the acid chloride, and the above-mentioned 0.1g of acid chloride and 4g of chitosan balls were prepared in dichloromethane Reaction in methane, the used chitosan spheres have a particle size of 10 microns, the product is washed and centrifuged with dichloromethane or ethanol, and finally dried to obtain the chitosan spheres loaded with the initiator.

[0029] Take 5 g of monomer dimethyl diallyl ammonium chloride, 2 g of chitosan spheres loaded with initiator, choose water as solvent, the temperature is 80 ° C, the polymerization time is 12 h, and then the obtained product is subjected to Soxhlet extraction with water, After drying, the polymer brush can be obtained. The average molecular weight of the obtained polymer brush is 190,000, and the graft density is 2.8 pieces / nm 2 .

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Abstract

The invention relates to a preparation method of a spherical polymer brush with chitosan as the core. Using acid chloride as an initiator, react acid chloride and chitosan microspheres in dichloromethane, the mass ratio of chitosan and acid chloride is between 1:0.01-1:0.05, and the product is washed and centrifuged with dichloromethane and ethanol, Dry to obtain the chitosan microspheres loaded with the initiator; Add solvent and monomer to the chitosan loaded with the initiator, feed nitrogen, and polymerize at 40-80°C for 1-24h, load triggers The mass ratio of the chitosan of the agent to the monomer is between 1:0.5-1:15; the obtained product is subjected to Soxhlet extraction and then dried to obtain the polymer brush. Small drug molecules, fluorescent molecules and other substances can be embedded in chitosan, and different monomers can be selected to obtain polymer brushes with different properties. The substance has a wide range of potential applications in the fields of biomedicine, colloid stabilizer, fuel cell, conductive polymer dopant, papermaking auxiliary and packaging materials.

Description

technical field [0001] The invention relates to a preparation method of a spherical polymer brush with chitosan as the core, belonging to the field of polymer composite materials. Background technique [0002] Polymer brush refers to a unique polymer system formed by connecting one end of the polymer molecular chain to the surface of the substrate with high density. It can effectively change the chemical and physical properties of the surface of materials. With its unique structure and properties, polymer brushes have been widely used in the fields of biomedicine, adsorbents, fuel cells, conductive polymer dopants, papermaking additives and packaging materials. application. [0003] The polymer brushes that have been prepared so far include spherical, flat, and star-shaped brushes. Among them, spherical polymer brushes have spherical silicon dioxide, spherical polystyrene, carbon spheres, etc. as cores, but the synthesis method of this patent with chitosan as the core has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/14C08F220/18C08F212/08C08F226/02C08F226/06
Inventor 黎厚斌张雄志黄驰黄瑜何宇航刘兴海
Owner WUHAN UNIV
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