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Preparation method of poly(n-isopropylacrylamide) inverse opal hydrogel

A technology of isopropyl acrylamide and inverse opal, which is applied in the fields of polymer materials and nanomaterials, can solve the problems of poor mechanical properties, single function and slow response of inverse opal hydrogels, and achieve excellent mechanical properties and simple equipment. , easy-to-control effects

Active Publication Date: 2022-03-11
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is: in order to overcome the problems of single function, high brittleness, difficult to remove the film, slow response and poor mechanical properties of chemically cross-linked inverse opal hydrogel existing in traditional polystyrene-based photonic crystals, provide A kind of preparation method of physically cross-linked poly(N-isopropylacrylamide) inverse opal hydrogel

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  • Preparation method of poly(n-isopropylacrylamide) inverse opal hydrogel

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Embodiment 1

[0035] A preparation method of physically cross-linked poly(N-isopropylacrylamide) inverse opal hydrogel, comprising the following specific steps:

[0036] 1) Synthesis of polystyrene microspheres:

[0037] Add 12g of styrene monomer to 150mL of deionized water and stir to disperse for 1 hour at a stirring speed of 350 rpm. After the dispersion is complete, add 0.2g of acrylic acid and 0.3g of potassium persulfate. After the addition, slowly raise the temperature to 75°C. Continue to react for 8 hours. After the reaction is over, put the obtained emulsion into a centrifuge and centrifuge 3 times for 30 minutes each time. After each centrifugation, remove the supernatant and then add deionized water. Finally, the centrifuged polyphenylene The ethylene microspheres were dried in an oven to obtain polystyrene microspheres with a particle diameter of 275 nm.

[0038] 2) Preparation of polystyrene photonic crystal:

[0039] The polystyrene microspheres obtained above were formula...

Embodiment 2

[0048] A preparation method of physically crosslinked poly(N-isopropylacrylamide) inverse opal hydrogel is characterized in that it comprises the following specific steps:

[0049] 1) Synthesis of polystyrene microspheres: 10 g of styrene monomer was taken, and other conditions were as in step 1) of Example 1 to obtain polystyrene microspheres with a particle diameter of 230 nm.

[0050] 2) Preparation of polystyrene photonic crystals: as in step 2) of Example 1, polystyrene photonic crystals with a green structural color were obtained.

[0051] 3) Preparation of carbon dots (C-dots): as in step 3) of Example 1.

[0052] 4) Preparation of physically cross-linked poly(N-isopropylacrylamide) (PNIPAm) hydrogel precursor solution: the mass fraction of hectorite was 2%, and other conditions were as in step 4) of Example 1.

[0053] 5) Preparation of physically cross-linked poly(N-isopropylacrylamide) (PNIPAm) inverse opal hydrogel: as in step 5 of Example 1), under constant condit...

Embodiment 3

[0055] A preparation method of physically crosslinked poly(N-isopropylacrylamide) inverse opal hydrogel is characterized in that it comprises the following specific steps:

[0056] 1) Synthesis of polystyrene microspheres: 8 g of styrene monomer was taken, and other conditions were as in step 1) of Example 1 to obtain polystyrene microspheres with a particle diameter of 210 nm.

[0057] 2) Preparation of polystyrene photonic crystals: as in step 2) of Example 1, polystyrene photonic crystals with blue structural color were obtained.

[0058] 3) Preparation of carbon dots (C-dots): as in step 3) of Example 1.

[0059] 4) Preparation of physically cross-linked poly(N-isopropylacrylamide) (PNIPAm) hydrogel precursor solution: the mass fraction of hectorite is 1%, and other conditions are as in step 4 of Example 1).

[0060] 5) Preparation of physically cross-linked poly(N-isopropylacrylamide) (PNIPAm) inverse opal hydrogel: as in step 5 of Example 1), under constant conditions, ...

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Abstract

The present invention provides a method for preparing poly(N-isopropylacrylamide) inverse opal hydrogel, specifically a method for preparing physically cross-linked poly(N-isopropylacrylamide) inverse opal hydrogel . The preparation method uses polystyrene photonic crystals as a template, injects a gel precursor solution containing lithium diatomaceous earth, carbon dots and N-isopropylacrylamide into the polystyrene photonic crystal template, and uses a "sandwich" method to make It is polymerized in a photonic crystal template to obtain a physically cross-linked poly(N-isopropylacrylamide) inverse opal hydrogel. The preparation method of the present invention is novel, simple in operation, selectable, good in repeatability, environmentally friendly, simple in equipment and low in cost, and the prepared hydrogel has distinct structural color and excellent fluorescence properties, and has excellent responsiveness to temperature stimuli.

Description

technical field [0001] The invention belongs to the field of polymer materials and nanometer materials, in particular to a preparation method of physically cross-linked poly(N-isopropylacrylamide) inverse opal hydrogel. Background technique [0002] N-isopropylacrylamide (NIPAm) is a linear organic compound whose polymer hydrogel has a low critical phase transition temperature (LCST) close to the physiological temperature of the human body. The macromolecular chain of poly(N-isopropylacrylamide) (PNIPAm) has both hydrophilic amido and hydrophobic isopropyl groups, so that both the linear PNIPAm aqueous solution and the cross-linked PNIPAm hydrogel present It has temperature-sensitive properties [ACS Nano, 2016, 10(6):5856-5863], and is widely used in the fields of drug controlled release, biochemical separation, and chemical sensors. [0003] In recent years, polymer hydrogels with inverse opal structure have been widely studied, but most of them are chemically cross-linked...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J3/075C08F120/54C08F2/44C08L33/24
CPCC08J3/24C08J3/075C08F120/54C08F2/44C08J2333/24
Inventor 陈艳军郑航马帅冯梦然伊斯宋伟政贺光耀王艺峰
Owner WUHAN UNIV OF TECH
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