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Method for preparing N-isopropyl acrylamide/multi-walled carbon nanotube composite microgel through in situ polymerization in microreactor

A technology of isopropylacrylamide and multi-walled carbon nanotubes, which is applied in the field of preparation of PNIPAM microgels, can solve the problems that the properties of polymer gels are difficult to meet, and achieve short reaction time, uniform particle size, and simple preparation methods Effect

Inactive Publication Date: 2010-07-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of a single-component polymer gel are difficult to meet the increasingly high requirements of society for materials, so the combination of gel and other substances has become one of the important ways to improve its properties.

Method used

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  • Method for preparing N-isopropyl acrylamide/multi-walled carbon nanotube composite microgel through in situ polymerization in microreactor
  • Method for preparing N-isopropyl acrylamide/multi-walled carbon nanotube composite microgel through in situ polymerization in microreactor
  • Method for preparing N-isopropyl acrylamide/multi-walled carbon nanotube composite microgel through in situ polymerization in microreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Adding multi-walled carbon nanotubes in the nitric acid aqueous solution whose ratio of nitric acid and water is 2:1, the ratio of multi-walled carbon nanotubes and nitric acid solution is 0.003g / ml, under the condition of 100 ℃ of oil bath, react 24 hour, the pH value of the washing adjustment solution is 7, and drying obtains the modified multi-walled carbon nanotube with good dispersibility in water;

[0031] (2) 0.1093g of N-isopropylacrylamide (monomer), 0.070g of N, N'-methylenebisacrylamide (crosslinking agent), 0.0906g of ammonium peroxosulfate (initiator) , 0.010g of the above-mentioned modified multi-walled carbon nanotubes were mixed with 10ml of distilled water to obtain a dispersed phase solution; 5ml of N,N,N',N'-tetramethylethylenediamine was poured into a beaker containing 50mL of soybean oil, Stir gently with a glass rod to make it evenly mixed to obtain a continuous phase solution with a concentration of 10% (v / v);

[0032] (3) Put the two solutio...

Embodiment 2

[0034] (1) Add multi-walled carbon nanotubes in the nitric acid aqueous solution whose ratio of nitric acid and water is 2:1, the ratio of multi-walled carbon nanotubes and nitric acid solution is 0.003g / ml, under the condition of 100 ℃ of oil bath, react 36 hour, the pH value of the washing adjustment solution is 7, and drying obtains the modified multi-walled carbon nanotube with good dispersibility in water;

[0035] (2) 0.153g of N-isopropylacrylamide (monomer), 0.09g of N, N'-methylenebisacrylamide (crosslinking agent), 0.0706g of ammonium peroxosulfate (initiator) , 0.009g of the above-mentioned modified multi-walled carbon nanotubes were mixed to obtain a dispersed phase solution, and 5ml of N,N,N',N'-tetramethylethylenediamine was poured into a beaker containing 50mL of soybean oil, and gently mixed with a glass rod Stir to make it evenly mixed to obtain a continuous phase solution;

[0036](3) Put the two solutions into 10mL glass syringes respectively, place them on...

Embodiment 3

[0038] (1) Adding multi-walled carbon nanotubes in the nitric acid aqueous solution whose ratio of nitric acid and water is 2:1, the ratio of multi-walled carbon nanotubes and nitric acid solution is 0.003g / ml, under the condition of 100 ℃ of oil bath, react 24 hour, the pH value of the washing adjustment solution is 7, and drying obtains the modified multi-walled carbon nanotube with good dispersibility in water;

[0039] (2) 0.2011g of N-isopropylacrylamide (monomer), 0.08g of N, N'-methylenebisacrylamide (crosslinking agent), 0.0806g of ammonium peroxosulfate (initiator) , 0.008g of the above-mentioned modified multi-walled carbon nanotubes and 10ml of distilled water were mixed to obtain a dispersed phase solution, and 15ml of N, N, N', N'-tetramethylethylenediamine was poured into a beaker containing 50mL soybean oil, and the glass Gently stir the stick to mix well to obtain a continuous phase solution;

[0040] (3) Put the two solutions into 10mL glass syringes respecti...

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Abstract

The invention relates to a method for preparing N-isopropyl acrylamide / multi-walled carbon nanotube composite microgel through in situ polymerization in a microreactor. The method comprises the following steps of: (1) preparing modified multi-walled carbon nanotubes; (2) dispersing modified multi-walled carbon nanotubes into N-isopropyl acrylamide, N,N'-methylene bisacrylamide and distilled water solution of ammonium persulfate serving as dispersed phases, and taking N,N,N',N'-tetramethyl ethylene diamine and edible oil as solution of continuous phases; and (3) loading the dispersed phases and the solution of continuous phases into a syringe respectively, putting the syringe on two boost pumps, and connecting microchannel reactors to generate liquid drops having uniform sizes; and carrying out polymerization reaction for 1 to 3s in water bath at the temperature of between 40 and 60 DEG C, and collecting and washing the microgel. The method has the advantages of simpleness, mild polymerization condition, short reaction time of between 1 and 3s, and suitability for industrialized production; and the prepared microgel has uniform particle sizes, the sizes of polymer microspheres are controlled by regulating the flow velocity of the dispersed phases and the solution of continuous phases, and the particle sizes are between 500 and 1,000 mu m.

Description

technical field [0001] The invention belongs to the field of PNIPAM microgel preparation, in particular to a method for preparing N-isopropylacrylamide / multi-walled carbon nanotube composite microgel by in-situ polymerization in a microreactor. Background technique [0002] Polymer gels with phase transition properties have great prospects in scientific research and applications and have attracted widespread attention from scientists. When the gel and its derivatives are subjected to various external stimuli (such as solution components, pH, ionic strength, electric field, light, etc.), various phase transitions will occur inside, resulting in volume changes. However, the properties of a single-component polymer gel are difficult to meet the increasingly high requirements of the society for materials, so the combination of gel and other substances has become one of the important ways to improve its properties. The volume phase transition temperature of PNIPAM microgel is ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F2/44
Inventor 王宏志纪磊鹏李耀刚张青红
Owner DONGHUA UNIV
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