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Method for preparing chemically crosslinked photonic crystal hydrogel with adjustable color

A chemical cross-linking, photonic crystal technology, applied in the field of photonic crystal hydrogel preparation, can solve problems such as poor mechanical strength of nanogels, and achieve the effects of weak mechanical strength, low cost, and temperature responsiveness

Inactive Publication Date: 2014-05-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the ester group in HEAc is easily hydrolyzed in alkali, the mechanical strength of the nanogel formed by the copolymerization and crosslinking of NIPAM and HEAc is very poor, which limits its application.

Method used

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  • Method for preparing chemically crosslinked photonic crystal hydrogel with adjustable color
  • Method for preparing chemically crosslinked photonic crystal hydrogel with adjustable color

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of colloidal crystal hydrogel solution:

[0027] (1) Dissolve 3.7903g of NIPAM, 0.3808g of HEAA, 0.0725g of N,N'-methylenebisacrylamide and 0.1095g of sodium lauryl sulfate in 250g of deionized water, blow N2 at room temperature to remove oxygen, and magnetically stir 120 minutes;

[0028] (2) The reaction temperature was raised to 70°C and kept for 40 minutes under the protection of N2;

[0029] (3) Add 0.17g of ammonium persulfate to the above solution, keep the N2 atmosphere, and continue to react for 4 hours;

[0030] (4) Then soak the obtained reactants in deionized water and dialyze for 7 days, change the water once a day to remove the residual reaction raw materials and electrolytes in the reaction system. The molecular weight cut-off of the dialysis bag used is 8000-14000. Instantly.

[0031] 2. Curing treatment of colloidal crystal hydrogel:

[0032] Put the obtained colloidal crystal hydrogel solution in an oven to heat and concentrate, adj...

Embodiment 2

[0034] 1. Preparation of colloidal crystal hydrogel solution:

[0035] (1) Dissolve 3.7903g of NIPAM, 0.3808g of HEAA, 0.0725g of N,N'-methylenebisacrylamide and 0.1095g of sodium lauryl sulfate in 250g of deionized water, blow N2 at room temperature to remove oxygen, and magnetically stir 120 minutes;

[0036] (2) The reaction temperature was raised to 70°C and kept for 40 minutes under the protection of N2;

[0037] (3) Add 0.17g of ammonium persulfate to the above solution, keep the N2 atmosphere, and continue to react for 4 hours;

[0038] (4) Then soak the obtained reactants in deionized water and dialyze for 7 days, change the water once a day to remove the residual reaction raw materials and electrolytes in the reaction system. The molecular weight cut-off of the dialysis bag used is 8000-14000. Instantly.

[0039] 2. Curing treatment of colloidal crystal hydrogel:

[0040] Put the obtained colloidal crystal hydrogel solution into an oven to heat and concentrate, a...

Embodiment 3

[0042] 1. Preparation of colloidal crystal hydrogel solution:

[0043](1) Dissolve 3.7864g NIPAM, 0.3960g HEAA, 0.0701g N,N'-methylenebisacrylamide and 0.0505g sodium lauryl sulfate in 250g deionized water, blow N2 at room temperature to remove oxygen, and magnetically stir 120 minutes;

[0044] (2) The reaction temperature was raised to 70°C and kept for 40 minutes under the protection of N2;

[0045] (3) Add 0.17g of ammonium persulfate to the above solution, keep the N2 atmosphere, and continue to react for 4 hours;

[0046] (4) Then soak the obtained reactants in deionized water and dialyze for 7 days, change the water once a day to remove the residual reaction raw materials and electrolytes in the reaction system. The molecular weight cut-off of the dialysis bag used is 8000-14000. Instantly.

[0047] 2. Curing treatment of colloidal crystal hydrogel:

[0048] Put the obtained colloidal crystal hydrogel solution in an oven to heat and concentrate, adjust its concentr...

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Abstract

The invention relates to a method for preparing chemically crosslinked photonic crystal hydrogel with an adjustable color. The method comprises the following steps: (1) dissolving N-isopropylacrylamide, N-hydroxyethyl acrylamide, a cross-linking agent and an emulsifier into deionized water, stirring, warming and keeping warm under the condition at 20-25 DEG C in a nitrogen condition, and then adding an initiator to continue to react for 1-4 hours, and dialyzing, so as to obtain a colloidal crystal hydrogel solution; (2) concentrating the obtained colloidal crystal hydrogel solution, standing at room temperature, adjusting the pH by adopting an NaOH solution, adding a crosslinking agent, evenly mixing, centrifuging, and standing at room temperature after taking, so as to obtain the chemically crosslinked photonic crystal hydrogel. The method is simple in process and low in cost, and the prepared photonic crystal hydrogel has thermosensibility. In addition, the obtained photonic crystal hydrogel is good in stability, and free of hydrolysis, the problem that nano hydrogel is easily decomposed because of ester hydrolysis in 2-hydroxy ethyl acrylate is solved, and the defects of the photonic crystal hydrogel in application are compensated.

Description

technical field [0001] The invention belongs to the field of photonic crystal hydrogel, in particular to a method for preparing a chemically cross-linked photonic crystal hydrogel with adjustable color. Background technique [0002] A photonic crystal is a material with an ordered structure formed by two or more materials with different dielectric constants arranged in a certain periodic order in space, and its photonic bandgap structure can adjust the direction of light propagation. Effective regulation. Among them, colloidal crystal refers to a two-dimensional or three-dimensional ordered structure composed of monodisperse submicron (submicro) or nanoscale (nano) colloidal microspheres in a solvent with low ionic strength. , A system similar to the crystal structure. [0003] Hydrogel is a kind of hydrophilic polymer between liquid and solid that can significantly swell in water and retain a large amount of water but is insoluble in water. It exists widely in nature as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08F220/54C08F220/58C08F222/38C08F2/26C08L33/24C08K5/41
Inventor 鲁希华李雪婷王朋邱高
Owner DONGHUA UNIV
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