Light-response polymer microgel particle and preparation method thereof

A microgel and polymer technology, applied in the field of polymers, can solve the problems of water dispersibility, reversible responsiveness, photoresponse function, stability, preparation route, etc., and achieve rapid and reversible adjustment and operation Convenient and convenient for industrial production

Active Publication Date: 2015-08-12
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] A method for preparing light-responsive polymer microgel particles specifically includes the following steps:

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

[0035] (1) Dissolve N-isopropylacrylamide, acrylic acid, N,N-methylenebisacrylamide in a molar ratio of 100:1-15:0.5-10 in deionized water to form an aqueous solution, and add ten Sodium dialkyl sulfate, control the concentration of sodium lauryl sulfate in the aqueous solution to 0-0.008 mol / L, and transfer the aqueous solution to the condensing reflux device, and heat it to reflux for 1-3 hours in a nitrogen stream, and then Ammonium persulfate was added and refluxed and stirred for 5-10 hours, the product obtained was the initial microgel, and then the initial microgel was dialyzed to obtain poly(N-isopropylacrylamide-acrylic acid) copolymer microgel ...

Embodiment 1

[0044] A method for preparing light-responsive polymer microgel particles specifically includes the following steps:

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

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

Embodiment 2

[0057] A method for preparing light-responsive polymer microgel particles specifically includes the following steps:

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

[0059] (1) The molar ratio of N-isopropylacrylamide, acrylic acid, N,N-methylenebisacrylamide is 100:10.7:1.7 completely dissolved in deionized water to form an aqueous solution, and 0.0017 mol / L twelve is added. The sodium alkyl sulfate is dissolved, and the aqueous solution is transferred to the condensing reflux device, and heated to reflux in a nitrogen stream for 3 hours, then ammonium persulfate is added to it, and reflux and stirring are continued for 5 hours, the product obtained is the initial microgel , And then dialyze the initial microgel to obtain poly(N-isopropylacrylamide-acrylic acid) copolymer microgel;

[0060] In this step, an aqueous so...

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Abstract

The invention relates to the technical field of polymer, and specifically relates to a light-response polymer microgel particle and a preparation method thereof. An azobenzene group, which can generate isomerization under light irradiation, is grafted on poly(N-isopropylacrylamie-acrylic acid) copolymerized microgel through chemical bonding to prepare azobenzene-modified poly(N-isopropylacrylamie-acrylic acid) copolymerized microgel particles, which have a good light-response effect. The weight-average fluid mechanical radius of the microgel particles is increased by 20% after the microgel particles are irradiated by ultraviolet lights with a length of 360 nanometers. After the micro particles are irradiated by visible lights with a length of 465 nanometers, the weight-average fluid mechanical radius is recovered to the initial size. The operation of the preparation method is simple and easily-controllable, the experiment design and technological method are simple, and the cot is low.

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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IPC IPC(8): C08F220/54C08F220/60C08F220/06
Inventor 赵传壮朱利强张利
Owner NINGBO UNIV
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