Hydrogel material with shape memory function and preparation and application thereof

A hydrogel and memory technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of difficult biodegradation, poor biocompatibility, and further improvement of stretch resistance, and achieve easy degradation, simple steps, The effect of avoiding fluorescence quenching phenomenon

Pending Publication Date: 2021-02-19
YUNNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of silica and synthetic polymer materials are poor biocompatibility and difficult biodegradation
In addition, in the rare earth composite materials prepared by traditional met

Method used

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  • Hydrogel material with shape memory function and preparation and application thereof
  • Hydrogel material with shape memory function and preparation and application thereof
  • Hydrogel material with shape memory function and preparation and application thereof

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Experimental program
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preparation example Construction

[0038] The preparation method of the above-mentioned hydrogel material with shape memory function comprises the following steps:

[0039] S1. Add CMC with a mass percentage concentration of 1-5% to the CNF sol, and stir at room temperature until fully dissolved;

[0040] S2. Add epichlorohydrin with a volume ratio concentration of 4 to 12% and sodium hydroxide with a molar concentration of 0.5 to 2M into the sol obtained in step S1, and fully stir evenly;

[0041] S3. Pour the sol obtained in step S2 into a suitable mold, then put it into a refrigerator, and freeze it at -25°C for 12 to 48 hours; S4. Thaw the gel obtained in step S3 in water, and wash it with a large amount of deionized water , to obtain a hydrogel;

[0042] S5. Soak the hydrogel obtained in step S4 in TbCl with a molar concentration of rare earth terbium ions of 0.01-0.1M 3 In the aqueous solution for 12-24 hours, and then washed with a large amount of deionized water to obtain a Tb-containing hydrogel;

...

Embodiment 1

[0050] Add 50 mg of CMC to 5 mL of CNF sol, and stir magnetically at room temperature until the CMC is fully dissolved. Then add 0.20mL of epichlorohydrin, stir evenly, then add 2mL of 0.5M sodium hydroxide solution, stir the above sol evenly, place it in a -25°C refrigerator for 12h, and then put the obtained jelly in deionized water Thaw, wash with plenty of deionized water, and soak the resulting hydrogel in 20 mL of 0.01M TbCl 3 12 hours in the aqueous solution, and then wash the hydrogel with a large amount of deionized water, then soak the hydrogel in 20 mL of 0.01M p-aminobenzoic acid aqueous solution for 12 hours, and then wash with a large amount of deionized water to obtain a hydrogel material.

Embodiment 2

[0052] Add 100 mg of CMC to 5 mL of CNF sol, and stir magnetically at room temperature until the CMC is fully dissolved. Then add 0.25mL epichlorohydrin, stir evenly, then add 2mL 0.6M sodium hydroxide solution, stir the above sol evenly, place it in a -25°C refrigerator for 24h, and then put the obtained jelly in deionized water Thaw, wash with plenty of deionized water, and soak the resulting hydrogel in 20 mL of 0.02M TbCl 3 After 12 hours in the aqueous solution, wash the hydrogel with a large amount of deionized water, then soak the hydrogel in 20 mL of 0.06M p-aminobenzoic acid aqueous solution for 12 hours, and then wash with a large amount of deionized water to obtain a hydrogel material.

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Abstract

The invention relates to the technical field of hydrogel composite materials, and discloses a hydrogel material with a shape memory function and preparation and application thereof. The hydrogel material is a rare earth complex formed by CNF/CMC/Tb/Ab, and the rare earth complex is connected with a cellulose network skeleton formed by CNF and CMC in a covalent bond mode, wherein Ab is sodium p-aminobenzoate, Tb is rare earth terbium ions, CMC is carboxymethyl cellulose, and CNF is cellulose nanofibers. Cellulose nanofibers are combined with carboxymethyl cellulose through hydrogen bonds to form a cellulose network framework, rare earth terbium ions are coordinated with carboxyl functional groups in the carboxymethyl cellulose so that the rare earth terbium ions are stably connected with the cellulose network framework in a covalent bond mode, and then sodium p-aminobenzoate is further coordinated with the rare earth terbium ions, green fluorescent material with excellent luminescence is formed, meanwhile, the material has an excellent shape memory function and can be used as a novel shape memory fluorescent material.

Description

technical field [0001] The invention relates to the technical field of hydrogel composite materials, more specifically, to a hydrogel material with shape memory function and its preparation and application. Background technique [0002] In order to expand the application range of the luminescent rare earth complexes, introducing the rare earth complexes into some matrix materials can improve the thermal stability and mechanical properties of the rare earth complexes. The traditional method is to dope rare earth complexes into some synthetic polymers or silica matrix. However, the disadvantages of silica and synthetic polymer materials are poor biocompatibility and difficult biodegradation. In addition, in the rare earth composite materials prepared by traditional methods, the tensile properties of the materials need to be further improved. In particular, the reports of hydrogel materials with both shape memory function and excellent luminescent properties are still rare. ...

Claims

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Application Information

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IPC IPC(8): C08L1/28C08L1/02C08K5/00C08J3/075C09K11/06C09K11/02
CPCC08J3/075C09K11/06C09K11/025C09K2211/182C08J2301/28C08J2401/02C08J2301/02C08J2401/28
Inventor 刘丰祎杨德超代天卫张金蒙田乙然张旭锋
Owner YUNNAN NORMAL UNIV
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