Novel nano-composite double network hydrogel and preparation method thereof

A nano-composite, dual-network technology, applied in the field of functional polymers, can solve problems such as low mechanical strength and limited application of hydrogels

Inactive Publication Date: 2010-11-10
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low mechanical strength of traditional hydr

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In a three-necked flask equipped with a reflux condenser and mechanical stirring, add 10-30ml of 33% dimethylamine or methylamine aqueous solution, and then add 1g of lithium diatomaceous earth and stir at room temperature for 0.5-3h. Then slowly add 7-30ml of epichlorohydrin dropwise at 20-80°C and react for 1-12 hours to obtain polycondensate / clay composite.

Embodiment 2

[0015] Use 5-30% NaOH solution in an ice-water bath to neutralize 2-20 g of one, two or three monomers of acrylic acid, methacrylic acid and propylene sulfonic acid until the neutralization degree is 20-90%, and then Add 0-15 ml of polycondensate / clay composite obtained in Example 1 to the system, and stir evenly. Then add 0.5-4% initiator ammonium persulfate and 0-0.2% cross-linking agent N, N'-methylenebisacrylamide. After mixing evenly, react at -10-80°C for 0.5-72 hours. The product was soaked in water, washed, and then dehydrated with absolute ethanol. The dehydrated product was placed in an oven at 80° C. and dried to constant weight to obtain a nanocomposite double network hydrogel.

Embodiment 3

[0017] Add 2-20 g of one, two or three monomers of acrylamide, N-isopropylacrylamide, and acrylonitrile into 0-15 ml of the polycondensate / clay composite obtained in Example 1, and stir evenly. Then add 0.5-4% initiator ammonium persulfate and 0-0.2% cross-linking agent N, N'-methylenebisacrylamide. After mixing evenly, react at -10-80°C for 0.5-72 hours. The product was soaked in water, washed, and then dehydrated with absolute ethanol. The dehydrated product was placed in an oven at 80° C. and dried to constant weight to obtain a nanocomposite double network hydrogel.

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Abstract

The invention relates to a novel nano-composite double network hydrogel and a preparation method thereof. The preparation method of the hydrogel comprises the steps of: performing a condensation (polycondensation) reaction of amines and epichlorohydrin or polyalcohol and aldehydes in clay solution to obtain a condensate (polycondensate)/clay composite first; and adding a hydrophilic monomer under the action of an initiator and a cross-linking agent to obtain the nano-composite double network hydrogel through free radical crosslinking polymerization, wherein in the condensation (polycondensation) reaction, the amines are selected from dimethylamine, methylamine, ethylamine, propylamine, diethylamine, quadrol, propylene diamine, diethylenetriamine, triethylenetetamine and tetraethylenepentamine, the polyalcohol is selected from glycol, propanediol, glycerol, butanediol, neopentyl glycol, pentaerythritol, polyvinyl alcohol, polyethylene glycol, glucose, sucrose, sorbierite, soluble starch and chitosan, the aldehydes are selected from formaldehyde, malonaldehyde and glutaraldehyde, clay is selected from laponite, bentonite or hydrophilic modified bentonite, and the hydrophilic monomer is selected from acrylic acid, acrylamide, N-Isopropylacrylamide, methacrylic acid, acrylonitrile and propene sulfonic acid. The novel hydrogel has the excellent mechanical strength under the condition of high moisture content.

Description

technical field [0001] The invention relates to a novel nanocomposite double-network hydrogel and a preparation method thereof, belonging to the field of functional polymers. Background technique [0002] Hydrogel is a new type of functional polymer material with a three-dimensional network structure through moderate crosslinking. It is insoluble in water, but can significantly swell in water, has a large water absorption capacity and strong water retention capacity, and is a class of functional polymers with wide application prospects. It can be used in agriculture, forestry and gardening, physiological hygiene, medicine, artificial organs and the like. However, due to the low mechanical strength of traditional hydrogels, the application fields of hydrogels are largely limited. In order to solve this problem, some hydrogels with new structures have been developed, including topological gels (Topological gel, TG, Okumura Y, Ito K, Adv Mater, 2001, 13:485-487), nanocomposit...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08L59/00C08L33/02C08L41/00C08L33/26C08L33/24C08L33/20C08K3/34C08J3/075
Inventor 徐世美费翔王吉德陈鹏
Owner XINJIANG UNIVERSITY
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