A photoresponsive polymer microgel particle and its preparation method

A microgel and polymer technology, applied in the field of polymers, can solve the problems of water dispersibility, reversible responsiveness, light-responsive function, stability, preparation route, easiness, etc., and achieve fast and reversible adjustment, equipment Simple, easy-to-use effects

Active Publication Date: 2017-07-07
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the current photoresponsive polymer microgel particles, that is, good water dispersibility, reversible responsiveness, stability of photoresponsive function and ease of preparation route cannot be achieved. To solve both problems, provide a photoresponsive polymer microgel particle and its preparation method

Method used

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Examples

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Comparison scheme
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preparation example Construction

[0033] A method for preparing photoresponsive polymer microgel particles, specifically comprising the following steps:

[0034] (These two steps include the preparation of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels and the azobenzene modification of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels)

[0035](1) Dissolve N-isopropylacrylamide, acrylic acid, and N,N-methylenebisacrylamide in a molar ratio of 100:1-15:0.5-10 completely in deionized water to form an aqueous solution, and add ten Dialkyl sodium sulfate, control the concentration of sodium lauryl sulfate in the aqueous solution to be 0-0.008 mol / L, and transfer the aqueous solution to the condensation reflux device, and heat and reflux in nitrogen flow for 1-3 hours, and then go to Add ammonium persulfate to it, and continue to reflux and stir for 5-10 hours, the product obtained is the initial microgel, and then the initial microgel is dialyzed to obtain poly(N-isopropylacrylamide-acryl...

Embodiment 1

[0044] A method for preparing photoresponsive polymer microgel particles, specifically comprising the following steps:

[0045] (These two steps include the preparation of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels and the azobenzene modification of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels)

[0046] (1) Dissolve N-isopropylacrylamide, acrylic acid, and N,N-methylenebisacrylamide in a molar ratio of 100:10:1.7 in deionized water to form an aqueous solution, and add sodium lauryl sulfate, Control the concentration of sodium lauryl sulfate in the aqueous solution to be 0.0019 mol / L, and transfer the aqueous solution to a condensation reflux device, and heat and reflux in a nitrogen flow for 3 hours, then add ammonium persulfate to it, and continue to reflux and stir After 5 hours, the obtained product is the initial microgel, and then the initial microgel is dialyzed to obtain poly(N-isopropylacrylamide-acrylic acid) copolymerized microgel; ...

Embodiment 2

[0057] A method for preparing photoresponsive polymer microgel particles, specifically comprising the following steps:

[0058] (These two steps include the preparation of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels and the azobenzene modification of poly(N-isopropylacrylamide-acrylic acid) copolymer microgels)

[0059] (1) Completely dissolve N-isopropylacrylamide, acrylic acid, and N,N-methylenebisacrylamide at a molar ratio of 100:10.7:1.7 in deionized water to form an aqueous solution, and add 0.0017 mol / L of dodecyl Alkyl sodium sulfate is dissolved, and the aqueous solution is transferred to a condensing reflux device, and heated to reflux in nitrogen flow for 3 hours, then ammonium persulfate is added to it, and reflux is continued for 5 hours, and the product obtained is the initial microgel , and then dialyze the initial microgel to obtain poly(N-isopropylacrylamide-acrylic acid) copolymerized microgel;

[0060] In this step, an aqueous solution is f...

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Abstract

The invention relates to the technical field of polymers, in particular to a photoresponsive polymer microgel particle and a preparation method thereof. In the present invention, an azobenzene group that can undergo isomerization under light irradiation is chemically bonded to poly(N-isopropylacrylamide-acrylic acid) copolymer microgel to prepare azobenzene Modified poly(N-isopropylacrylamide-acrylic acid) copolymer microgel, the copolymer microgel of the prepared product has a good photoresponse effect, and the weight-average hydrodynamic radius of the microgel particles is at a wavelength of 360 nanometers of ultraviolet light After irradiation, an increase of more than 20% occurs, and the weight-average hydrodynamic radius of the microgel particles can return to the original size after irradiation with visible light with a wavelength of 465 nanometers. The preparation method of the invention has simple experimental operation and easy control, simple experimental equipment and process method, and low cost.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a photoresponsive polymer microgel particle and a preparation method thereof. Background technique [0002] Microgels usually refer to colloidal particles with a particle diameter between 50nm and 5μm and highly cross-linked molecules. When the external temperature is lower than the volume phase transition temperature (VPTT) of poly(N-isopropylacrylamide-acrylic acid) copolymerized microgel in aqueous solution, the microgel particles absorb water and swell, and the particle size becomes larger, while when the temperature is high During VPTT, it will shrink and lose water violently, and many achievements have been made in the research and application of temperature sensitivity [Xiao Yuting, Chen Mingqing, Lu Tianhong, Huang Xiaohua. Chemical Technology Market, 2005, 1:30]. In addition, the pH value and chemical stimulation can also cause significant changes in the degree of swel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/54C08F220/60C08F220/06
Inventor 赵传壮朱利强张利
Owner NINGBO UNIV
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