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High-strength high-toughness self-repairing fluorescent double-network hydrogel and preparation method thereof

A self-healing, dual-network technology, applied in the field of nanocomposite hydrogel preparation, can solve the problems of lack of energy dissipation mechanism, easy leaching of fluorescent substances, no effective solution to inhomogeneity, etc. The effect of uniform appearance and improved mechanical properties

Active Publication Date: 2020-05-19
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most fluorescent nanocomposite hydrogels are formed by embedding fluorescent nanoparticles into the hydrogel matrix through physical cross-linking. However, in the harsh external environment, the fluorescent substances of the hydrogel matrix are prone to leaching.
In addition, the embedded fluorescent nanoparticles do not effectively solve the problems of their own structure inhomogeneity and lack of energy dissipation mechanism, mechanical properties and restorative properties.

Method used

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  • High-strength high-toughness self-repairing fluorescent double-network hydrogel and preparation method thereof
  • High-strength high-toughness self-repairing fluorescent double-network hydrogel and preparation method thereof
  • High-strength high-toughness self-repairing fluorescent double-network hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a high-strength self-healing fluorescent double network hydrogel and its preparation method, which specifically includes the following steps:

[0037] S1. Preparation of Rare Earth Doped NaYF 4 @NaYF 4 Up-conversion nanoparticles: Weigh 2 mmol of rare earth metal salt (specifically: 0.4732 g (1.56 mmol) YCl 3 ·6H 2 O, 0.1549 g (0.4 mmol) YbCl 3 ·6H 2 O, 0.0158 g (0.04 mmol) ErCl 3 ·6H 2 O) Put in a 100 mL round bottom flask, add 30 mL octadecene and 12 mL oleic acid, heat to 140°C under magnetic stirring, remove the low boiling point solvent in the solution by vacuuming, then cool down to 50°C, then add 20 mL of methanol solution dissolved with 0.2 g (5 mmol) of sodium hydroxide and 0.2936 g (8 mmol) of ammonium fluoride was stirred for 60 min, then heated to 110°C, vacuumed to remove methanol in the solvent, and then under nitrogen protection , heated to 310°C, kept for 1.5h, and then naturally cooled to room temperature. The product wa...

Embodiment 2

[0049] This embodiment provides a method for preparing a high-strength self-healing fluorescent double network hydrogel, which specifically includes the following steps:

[0050] S1. Preparation of Rare Earth Doped NaGdF 4 Down-conversion nanoparticles: Weigh 2 mmol of rare earth metal salt (specifically: 0.6319 g (1.7 mmol) GdCl 3 ·6H 2 O, 0.0745 g (0.20 mmol) CeCl 3 ·7H 2 O, 0.0366 g (0.1 mmol) EuCl 3 ·6H 2 O) Put in a 100 mL round bottom flask, add 30 mL octadecene and 12 mL oleic acid, heat to 140°C under magnetic stirring, remove the low boiling point solvent in the solution by vacuuming, then cool down to 50°C, then add 20 mL of methanol solution with 0.2 g (5 mmol) of sodium hydroxide and 0.2936 g (8 mmol) of ammonium fluoride dissolved therein was stirred for 60 min, then heated to 110°C, vacuumed to remove methanol in the solvent, and then under nitrogen protection, The temperature was raised to 310°C, kept for 1.5h, and then cooled to room temperature naturally...

Embodiment 3

[0055] With reference to Example 1, this example provides a method for preparing a high-strength self-healing fluorescent double network hydrogel. The difference from Example 1 is that in step S1, 2 mmol 0.6064 g YCl 3 ·6H 2 O is replaced by 2mmol rare earth metal salt (specifically: 0.6319 g (1.7mmol) GdCl 3 ·6H 2 O, 0.0745 g (0.20 mmol) CeCl 3 ·7H 2 O, 0.0366 g (0.1 mmol) EuCl 3 ·6H 2 o).

[0056]The high-strength self-healing fluorescent double network hydrogel prepared in this example has high mechanical properties, good recovery and self-healing properties. In addition, it emits green light under 980 nm laser irradiation. It emits red light under 254 nm laser irradiation.

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Abstract

The invention discloses high-strengthhigh-toughness self-repairing fluorescent double-network hydrogel and a preparation method thereof. The preparation method comprises the following steps: adding double-bond modified rare earth doped NaREF4 fluorescent nanoparticles into a solution system consisting of agar, a monomer and an initiator, and carrying out photo-initiation polymerization to generatephysical crosslinking and chemical crosslinking, thereby obtaining the high-strengthhigh-toughness self-repairing fluorescent double-network hydrogel. By adding the double-bond modified rare earth doped NaREF4 fluorescent nanoparticles, the hydrogel is endowed with adjustable and concealed fluorescence characteristics, the surface modified double bonds can be crosslinked with a hydrogel monomer to serve as a nano crosslinking agent, the crosslinking degree of a hydrogel network is increased, and the mechanical property of the hydrogel network is improved. The high-strengthhigh-toughness self-repairing fluorescent double-network hydrogel prepared by the invention not only has high mechanical strength, high toughness, fatigue resistance and self-healing performance, but also has adjustableand concealed fluorescence performance, and has good application prospects in the fields of biological detection, sensing, intelligent packaging and the like.

Description

technical field [0001] The invention relates to the field of preparation of nanocomposite hydrogels, in particular to a high-strength self-repairing fluorescent double-network hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a three-dimensional polymer network composed of hydrophilic polymers, which can absorb a large amount of water, and has very soft characteristics and excellent biocompatibility after absorbing water. These special structural characteristics make hydrogel in Tissue engineering, drug delivery carriers, sensors and actuators, enzyme immobilization, artificial organs, drug and gene delivery, wound dressings and other fields have broad application prospects. However, traditional hydrogels usually have disadvantages such as low gel strength, poor toughness, and slow water absorption, which cannot meet the applications with special functional requirements. In the prior art, in-depth research and exploration have been carried...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L5/12C08L51/10C08F292/00C08F220/58
CPCC08J3/075C08F292/00C08J2351/10C08J2405/12C08F220/58
Inventor 许建雄谢少文张昌凡谭海湖龚果陈殷
Owner HUNAN UNIV OF TECH
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