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A kind of preparation method of anisotropic cellulose-based hydrogel

A cellulose-based, anisotropic technology, which is applied in the field of anisotropic cellulose-based hydrogel preparation, can solve problems such as difficult hydrogels, and achieve the effects of strong covalent bonds, high development potential, and cost reduction

Active Publication Date: 2022-01-21
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to prevent the aggregation of ferrofluids under a strong magnetic field, most ferrofluids are insulated, so that it is difficult to produce anisotropic conductive hydrogels using traditional ferromagnetism.

Method used

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  • A kind of preparation method of anisotropic cellulose-based hydrogel
  • A kind of preparation method of anisotropic cellulose-based hydrogel
  • A kind of preparation method of anisotropic cellulose-based hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example was carried out as follows.

[0033] (1) 100mL concentration is 0.55wt% wood pulp cellulose suspension, 0.6g NaIO , 2mL isopropanol are mixed in Erlenmeyer flask, under 500rpm stirring velocity, 65 ℃ dark reaction 12h, then through centrifugation, Wash with deionized water and freeze-dry to obtain dialdehyde cellulose; add dialdehyde cellulose to a round-bottomed flask containing 100 mL of deionized water, react at 100°C for 2 hours at a stirring speed of 300 rpm, centrifuge and concentrate to obtain transparent dialdehyde cellulose Plain aqueous solution, its concentration is determined to be 3.3g / 10g.

[0034] (2) Get the dialdehyde cellulose (10g) gained in step (1) to remove moisture by centrifugation, and then mix with NH 3 ·H 2 O (6 mL), methanol (30 mL) were mixed well. Using a 100mL reactor in Ru / C catalyst (0.1g), 2MPa of H 2 Under pressure, react at 100°C for 2 hours to obtain ammoniated cellulose derivatives.

[0035] (3) Add the ammoniated ...

Embodiment 2

[0041] This example was carried out as follows.

[0042] (1) Obtain a transparent dialdehyde cellulose aqueous solution according to the embodiment step (1).

[0043] (2) The operation of step (2) was carried out with reference to the corresponding steps in Example 1, except that the reaction time in step (2) was 3h.

[0044] (3) The operation of step (3) was carried out with reference to the corresponding steps in Example 1, except that the amount of dopamine added in step (3) was 0.03 g, and the reaction pH was 8.2.

[0045] (4) The operation of step (4) is carried out with reference to the corresponding steps in Example 1, except that 0.1 mL of 28% NH 3 ·H 2 The reaction after O was 80°C, 5h.

[0046] (5) The operation of step (5) is carried out with reference to the corresponding steps in Example 1, except that the amount of magnetic hybrid compound added in step (5) is 0.026 g. Under these conditions, the longitudinal tensile strength of the oriented hydrogel obtained...

Embodiment 3

[0048] This example was carried out as follows.

[0049] (1) Obtain a transparent dialdehyde cellulose aqueous solution according to the embodiment step (1).

[0050] (2) The operation of step (2) is carried out with reference to the corresponding steps in the embodiment one, and the difference is that H in the reaction in the step (2) 2 The pressure is 3MPa.

[0051] (3) The operation of step (3) was carried out with reference to the corresponding steps in Example 1, except that the amount of dopamine added in step (3) was 0.03 g, and the reaction pH was 8.5.

[0052] (4) The operation of step (4) is carried out with reference to the corresponding steps in Example 1, except that 0.1 mL of 28% NH 3 ·H 2 The reaction after O was 90 °C for 1 h.

[0053] (5) The operation of step (5) is carried out with reference to the corresponding steps in Example 1, except that the amount of magnetic hybrid compound added in step (5) is 0.1 g. Under this condition, the longitudinal tensi...

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Abstract

The invention discloses a method for preparing anisotropic cellulose-based hydrogel, which comprises the following steps: ammonating dialdehyde cellulose obtained after being oxidized by sodium periodate; and then utilizing the ammoniated cellulose and dopamine Perform Schiff reaction to obtain cellulose-dopamine nanosheets; then use the deposition method to deposit Fe 3 o 4 Nanoparticles are deposited on the surface of cellulose-dopamine nanosheets to obtain magnetic cellulose-dopamine nanosheets; and then the cellulose deposited with nanoparticles is formed into a hydrogel by a simple polymerization method. The present invention utilizes cellulose widely present in biomass as a raw material, and the cost is low; the whole experimental process has mild reaction conditions and less pollution, and the obtained cellulose-based hydrogel has typical anisotropy and magnetism, which broadens the range of cellulose The application path has extremely high potential value.

Description

technical field [0001] The invention belongs to the field of natural polymer materials, and in particular relates to a preparation method of anisotropic cellulose-based hydrogel. Background technique [0002] Water-rich hydrogel soft structures are similar to biological systems and have wide applications in biomaterials, wearable devices, chemical engineering, etc. It is worth noting that the biological tissue of organisms presents a highly ordered composite structure, and therefore can withstand large external forces. Inspired by living organisms, highly anisotropic hydrogels have received widespread attention for soft material applications. However, in stark contrast, most of the synthesized hydrogels exhibit an isotropic structure due to the disordered crosslinking of monomers. Therefore, it is of great significance to obtain anisotropic hydrogels with good mechanical properties. [0003] At present, through directional freeze-drying, self-assembly, magnetic field and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08F251/02C08F220/56C08F222/38C08L51/02C08K3/22C08B15/06
CPCC08J3/075C08F251/02C08B15/06C08J2351/02C08K2003/2275C08K2201/011C08K2201/01C08F220/56C08F222/385
Inventor 林鹿闫贵花曾宪海孙勇唐兴
Owner XIAMEN UNIV
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