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Fluorescent microgel with adjustable linear temperature responsiveness and preparation method thereof

A temperature-responsive, micro-gel technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as singleness, limitation, and uncontrollable temperature response speed, and achieve easy operation, low production cost, and wide commercial applications foreground effect

Inactive Publication Date: 2017-09-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Big Molecules" ( Macromolecules 2016, 49, 6095-6100) reported a thermosensitive microgel whose particle size can show a linear response with temperature changes within a certain range, but the speed of the particle size change to temperature response cannot be controlled, and at the same time A single linear response also makes it limited in more application fields

Method used

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  • Fluorescent microgel with adjustable linear temperature responsiveness and preparation method thereof
  • Fluorescent microgel with adjustable linear temperature responsiveness and preparation method thereof
  • Fluorescent microgel with adjustable linear temperature responsiveness and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 2.343g of 2-methoxyethyl acrylate, 0.96g of comonomer oligoethylene glycol methacrylate, 0.1g of carbon quantum dots prepared by double bond modified microwave method and 0.1g of dodecylsulfuric acid Sodium was dissolved and dispersed in 300mL deionized water, nitrogen gas was introduced and mechanical stirring was continued for 1 hour, then 0.037 g potassium persulfate was added, and stirring was continued for 6 hours at 70°C under nitrogen atmosphere to carry out polymerization reaction. The obtained microgel was dialyzed in deionized water for 7 days to remove unreacted small molecules to obtain a linear thermosensitive fluorescent microgel.

[0029] From figure 1 It can be seen that the microgel particle size is uniform and the dispersion is good. figure 2 Shown are the fluorescence spectra of the microgels at different temperatures. From image 3 and Figure 4 It can be seen that the particle size and fluorescence intensity of the composite microgels change l...

Embodiment 2

[0031] Others are with embodiment 1. However, the amount of carbon quantum dots added was 0.165 g, and a core-shell microgel was obtained.

[0032] From Figure 5 It can be seen that the microgel has a core-shell structure. From Figure 6 It can be seen that the particle size of the composite microgel decreases linearly with the increase of temperature, that is, it has temperature sensitivity.

Embodiment 3

[0034] Others are with embodiment 1. However, 2.343g of 2-methoxyethyl acrylate was replaced with 1.991g of 2-methoxyethyl acrylate, and 0.96g of comonomer oligoethylene glycol methacrylate was replaced with 1.296g of oligoethylene glycol Alcohol methacrylate. A linear thermosensitive fluorescent microgel was obtained.

[0035] Figure 7 Shown are the fluorescence spectra of the microgels at different temperatures. From Figure 8 It can be seen that the particle size of the composite microgel decreases linearly with the increase of temperature, that is, it has temperature sensitivity.

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Abstract

The invention belongs to the technical field of polymer materials, particularly relates to a fluorescent microgel with adjustable linear temperature responsiveness and a preparation method thereof. Polymerizable carbon quantum dots and thermosensitive monomer are treated by a free radical emulsion polymerization method to obtain a functionalized microgel with a composite structure. In the preparation method, the carbon quantum dots are used as crosslinking agent, by changing the content of the carbon quantum dots initially added in reaction, the microgel with different thermosensitivity is obtained by just one-step preparation directly. The particle size and the fluorescence intensity of the microgel all change linearly with the change of temperature. The reparation method has the advantages of being simple and convenient to operate, simple in post-processing, low in production cost, friendly in environment, easy in batch production; having large-scale preparation potential and broad commercial application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a fluorescent microgel with adjustable linear temperature response and a preparation method thereof. Background technique [0002] Intelligent temperature-sensitive polymers have attracted extensive attention because of their great application value. Various materials such as small organic molecules, carbon nanotubes and quantum dots are often used to modify polymers to obtain fluorescent macromolecules. "Applied Materials and Interfaces" ( ACS Appl. Mater. Interfaces. 2014, 6, 4650-4657) reported a core-shell structure gel with organic small molecules of tetraphenylethylene derivatives as the source of fluorescence, and its fluorescence intensity linearly increases with temperature within a certain temperature range However, the gel particle size shows a rapid thermal response when changing with temperature. "Big Molecules" ( Macromolecules 2016, 49,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/28C08F2/26C08F2/44C08K3/04C09K11/06
CPCC08F2/26C08F2/44C08F283/065C08F2800/20C08K3/04C09K11/06C09K2211/14C08F220/281
Inventor 孙文慧武培怡
Owner FUDAN UNIV