Cellulose nanocrystal-polyacrylamide double-network hydrogel and preparation method thereof

Abstract

The invention discloses a cellulose nanocrystal-polyacrylamide double-network hydrogel and a preparation method thereof. The preparation method sequentially comprises the following steps: S1, carryingout acidolysis on microcrystalline cellulose by 64wt% concentrated sulfuric acid, carrying out standing, high-speed centrifuging and dialyzing to obtain cellulose nanocrystal cement slurry; S2, sequentially dissolving the cellulose nanocrystal cement slurry, acrylamide, a photoinitiator, N,N'-methylene bisacrylamide and glutaraldehyde in deionized water, carrying out full stirring, carrying out heating and carrying out oscillating by an oscillator to form a transparent solution; S3, introducing inert gas into the transparent solution to remove dissolved oxygen in the solution; and S4, carrying out photo-initiation, wherein the target product is obtained after polymerization is finished. The preparation method has the advantages of simplicity and feasibility, the cellulose nanocrystalline-polyacrylamide double-network hydrogel is prepared rapidly and efficiently, and ways for preparing hydrogel are expanded. The preparation method of the double-network hydrogel has a simple process, isconvenient to operate, does not need additional equipment, has small environmental pollution and can realize macroscopic preparation.

Description

technical field

[0001] The application relates to a method for preparing a double network hydrogel by photoinitiation, in particular to a cellulose nanocrystal, a polyacrylamide double network hydrogel and a preparation method thereof. Background technique

[0002] Hydrogel is a three-dimensional network polymer formed by chemical or physical cross-linking, which can absorb a large amount of liquid in a short time and retain the liquid without being dissolved. Since hydrogels entered people's field of vision, the preparation process and application range of hydrogels have been continuously optimized and increased, but there are still many problems to be solved urgently in hydrogels, such as poor water absorption, poor water retention, and poor salt tolerance. , poor mechanical strength, poor degradability, etc.

[0003] The concept of double network hydrogel was first proposed by Professor Gong Jianping of Hokkaido University. It contains two networks, the first network is...

Examples

Embodiment 1

[0033] The first embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 4wt% cellulose nanocrystal cement slurry and 96wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0034] The preparation method comprises the steps in turn:

[0035] Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0036] Step 2: Preparation of mixed solution - 0.69g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde Dissolve together in 10mL deionized water, stir well, heat at 60°C for 20min, and v...

Embodiment 2

[0040] The second embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 8wt% cellulose nanocrystal cement slurry and 92wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0041] The preparation method comprises the steps in turn:

[0042] Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0043] Step 2: Preparation of mixed solution - 1.38g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde in sequence Dissolve together in 10mL deionized water, stir well, heat at 60°C for...

Embodiment 3

[0047] The third embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 12wt% cellulose nanocrystal cement slurry and 88wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0048] The preparation method comprises the steps in turn:

[0049]Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0050] Step 2: Preparation of mixed solution - 2.07g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde in sequence Dissolve together in 10mL deionized water, stir well, heat at 60°C for ...

technical field

[0001] The application relates to a method for preparing a double network hydrogel by photoinitiation, in particular to a cellulose nanocrystal, a polyacrylamide double network hydrogel and a preparation method thereof. Background technique

[0002] Hydrogel is a three-dimensional network polymer formed by chemical or physical cross-linking, which can absorb a large amount of liquid in a short time and retain the liquid without being dissolved. Since hydrogels entered people's field of vision, the preparation process and application range of hydrogels have been continuously optimized and increased, but there are still many problems to be solved urgently in hydrogels, such as poor water absorption, poor water retention, and poor salt tolerance. , poor mechanical strength, poor degradability, etc.

[0003] The concept of double network hydrogel was first proposed by Professor Gong Jianping of Hokkaido University. It contains two networks, the first network is...

Examples

Embodiment 1

[0033] The first embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 4wt% cellulose nanocrystal cement slurry and 96wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0034] The preparation method comprises the steps in turn:

[0035] Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0036] Step 2: Preparation of mixed solution - 0.69g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde Dissolve together in 10mL deionized water, stir well, heat at 60°C for 20min, and v...

Embodiment 2

[0040] The second embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 8wt% cellulose nanocrystal cement slurry and 92wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0041] The preparation method comprises the steps in turn:

[0042] Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0043] Step 2: Preparation of mixed solution - 1.38g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde in sequence Dissolve together in 10mL deionized water, stir well, heat at 60°C for...

Embodiment 3

[0047] The third embodiment of the present invention provides a cellulose nanocrystal, polymer cement slurry containing 12wt% cellulose nanocrystal cement slurry and 88wt% acrylamide monomer, prepared by photoinitiation method under the condition of pH=7. A method for acrylamide double network hydrogels.

[0048] The preparation method comprises the steps in turn:

[0049]Step 1: Preparation of cellulose nanocrystals—acid hydrolyze microcrystalline cellulose with 64wt% concentrated sulfuric acid, and then stand still, high-speed centrifugation, and dialysis to obtain cellulose nanocrystal cement slurry, which is prepared with deionized water to pH=7. Concentration is the cement slurry of 10wt%;

[0050] Step 2: Preparation of mixed solution - 2.07g cellulose nanocrystal cement slurry, 1.8g acrylamide, 10.52mg photoinitiator Irgacure2959, 1.18mg N,N'-methylenebisacrylamide, 36μL glutaraldehyde in sequence Dissolve together in 10mL deionized water, stir well, heat at 60°C for ...

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