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Method for preparing nano compound temperature-sensitive hydrogel by using frontal polymerization technology

A temperature-sensitive hydrogel and nanocomposite technology, which is applied in the treatment of dyed low-molecular-weight organic compounds, fibrous fillers, etc., can solve the problems of high cost, limited raw materials, long polymerization time, etc., and achieves low cost, sensitive response, and fast response. Effect

Inactive Publication Date: 2010-11-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a method for preparing high-strength nanocomposite temperature-sensitive hydrogel by wave polymerization to meet the problems of inorganic / organic phase separation, long polymerization time, limited raw materials, and high cost in the prior art. and the needs of life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 5 grams of nano-sized sodium montmorillonite in 400 milliliters of deionized water, stir at 70° C. for 1 hour, then add 100 milliliters of dihydroxyethylmethylammonium bromide aqueous solution with a mass percent concentration of 5%, and continue heating and stirring for 3 Hours, centrifuged, washed with water / ethanol (volume ratio: 1:1) mixture for many times to remove unreacted bromide ions in the powder, then vacuum-dried at 35°C, ground, and sieved to obtain nano-scale organic montmorillonite.

[0026] 10 grams of N-isopropylacrylamide and 0.02 grams of N, N'-methylenebisacrylamide were dissolved in 5 grams of dimethyl sulfoxide to form a solution, and then 3 grams of nano-scale organic montmorillonite was added to the solution under the action of ultrasonic waves. Disperse evenly in an organic solvent, and finally add 0.2 g of potassium persulfate, mix the above substances evenly and pour them into a tubular reactor, and heat the upper end of the tubular react...

Embodiment 2

[0028] Weigh 5 grams of nano-sized sodium montmorillonite in 400 milliliters of deionized water, stir at 70 ° C for 1 hour, then add 100 milliliters of cetyltrimethylammonium bromide aqueous solution with a mass percent concentration of 6%, and continue heating and stirring After 3 hours, centrifuge and wash off the unreacted bromide ions in the powder with water / ethanol (volume ratio: 1:1) mixture several times, then vacuum-dry at 35°C, grind, and sieve to obtain nano-scale organic montmorillonite .

[0029] 10 grams of N-isopropylacrylamide and 0.04 grams of N, N'-methylenebisacrylamide were dissolved in 9 grams of dimethyl sulfoxide to form a solution, and then 0.5 grams of nano-scale organic montmorillonite was added, and under the action of ultrasonic waves, Disperse evenly in an organic solvent, and finally add 0.1 g of potassium persulfate, mix the above substances evenly and pour them into a tubular reactor, and heat the upper end of the tubular reactor with a resistan...

Embodiment 3

[0031]Weigh 5 grams of nanoscale sodium-based montmorillonite in 400 milliliters of deionized water, stir at 70° C. for 1 hour, then add 100 milliliters of octadecylbenzyl ammonium chloride aqueous solution with a mass percentage concentration of 7%, and continue heating and stirring for 3 Hours, centrifuged, washed with water / ethanol (volume ratio: 1: 1) mixed solution for many times to remove unreacted chloride ions in the powder, then vacuum-dried at 35° C., ground, and sieved to obtain nano-scale organic montmorillonite.

[0032] 10 grams of N-isopropylacrylamide and 0.1 gram of N, N'-methylenebisacrylamide were dissolved in 14 grams of dimethyl sulfoxide to form a solution, and then 1 gram of nano-scale organic montmorillonite was added to the solution under the action of ultrasonic waves. Disperse evenly in an organic solvent, and finally add 0.3 g of azobisisobutyronitrile, mix the above materials evenly and pour them into a tubular reactor, and heat the upper end of the...

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Abstract

The invention belongs to the technical field of functional macromolecule material preparation and in particular relates to a method for preparing nano compound temperature-sensitive hydrogel by using frontal polymerization technology. The method comprises the following steps of: organizing nano-scale sodium-based montmorillonite with a cationic modifier first and then dissolving or dispersing a temperature-sensitive monomer, a crosslinking agent, the nano-scale sodium-based montmorillonite and an initiator into a dimethylsulfoxide solvent, and heating the mixture at the upper end of a tubular reactor to allow the initiator to decompose with heat; removing the heat source after the reaction beings, and allowing the heat generated by the polymerization per self to spread to a non-reacted area to form a polymerization front; allowing the polymerization front to spread automatically to gradually convert the raw materials into polymers; and rinsing the polymerization product with de-ionized water to obtain the nano compound temperature-sensitive hydrogel. The method has the advantages of low cost, quick reaction and simple process; and the prepared nano compound temperature-sensitive hydrogel has the characteristics of high strength and sensitive response.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional polymer materials, and in particular relates to a method for preparing nanocomposite temperature-sensitive hydrogel by adopting wave polymerization technology. Background technique [0002] Smart hydrogels are hydrophilic polymers with a three-dimensional network structure that can respond significantly to small changes or stimuli in the external environment (such as temperature, pH value, electricity, light, magnetic field, specific biomolecules, etc.). The responsiveness of temperature-sensitive hydrogel depends on the change of temperature, has a critical phase transition temperature, and can change its phase state or swell and shrink in response to temperature changes. Separation and other aspects have broad application prospects. Poly(N-isopropylacrylamide) (PNIPAM) is a widely studied temperature-sensitive functional polymer hydrogel, which undergoes a volume phase transit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F222/38C08F222/14C08F222/20C08F2/44C08K9/04C08K3/34C08J3/075C08J9/14C09C1/28C09C3/08
Inventor 燕青芝冯巧葛昌纯
Owner UNIV OF SCI & TECH BEIJING
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