Transparent ion-conductive cellulose hydrogel and its preparation method and application

Abstract

The invention discloses a transparent ion-conductive cellulose hydrogel, a preparation method and application thereof. In the present invention, the cellulose is uniformly dispersed in an aqueous solution of alkyl ammonium hydroxide, frozen at -24°C, thawed at room temperature after being completely frozen, and a transparent and uniform cellulose solution is obtained after centrifugation and defoaming. After stirring mechanically for 20 minutes, centrifuge and defoam, spread it on a glass plate or other smooth surface by casting method, put it into a series of electrolyte / water / organic solvent after cross-linking at room temperature, and let it stand at 0°C for 12 ~24h, a transparent ion-conducting cellulose hydrogel was obtained. The invention prepares the ion-conducting hydrogel by regenerating cellulose in the aqueous electrolyte solution, and the operation is simple and convenient. The obtained ion-conducting cellulose hydrogel has adjustable mechanical properties and electrical properties, and has very broad application prospects.

Description

technical field

[0001] The invention relates to the field of natural polymer hydrogels, in particular to a transparent ion-conductive cellulose hydrogel and its preparation method and application. Background technique

[0002] With the development of modern science and technology, the status of renewable resources and environment-friendly resources in scientific research is becoming more and more important. Plant cellulose, as the most abundant natural polymer in nature, has always been an important direction of scientific research due to its renewability, degradability, biocompatibility, non-toxicity and other properties. Therefore, plant cellulose has broad application prospects in water treatment, wearable devices, flexible electronic materials, tissue engineering materials, etc.

[0003] At present, most of the traditional conductive hydrogels are composed of intrinsic conductive polymers and other hydrogel matrices, but due to the rigid chain structure of the conductiv...

Examples

Embodiment 1

[0041] Set the molecular weight to 1.08×10 5 The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.4 mL of epichlorohydrin dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the epichlorohydrin evenly in the cellulose solution, and mix the obtained epichlorohydrin / cellulose The mixed solution was degassed by centrifugation at 0 °C, and the obtained clear solution was spread on a glass plate by the continuous flow method. First put it in a windless environment at 20°C, put it in a coagulation bath of 1mol / L NaCl aqueous solution after 2 hours, and then put the coagulation bath in a refrigerator at 0°C for 24 hours, and the obtained cellulose ionized water coagulates The tensile strength of the adhesive is 2.5...

Embodiment 2

[0043] Set the molecular weight to 1.08×10 5The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.4 mL of epichlorohydrin dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the epichlorohydrin evenly in the cellulose solution, and mix the obtained epichlorohydrin / cellulose The mixed solution was degassed by centrifugation at 0 °C, and the obtained clear solution was spread on a glass plate by the continuous flow method. First put it in a windless environment at 20°C, put it in a coagulation bath of 3mol / L NaCl aqueous solution after 2 hours, and then put the coagulation bath in a refrigerator at 0°C for 24 hours, and the obtained cellulose ionized water coagulates The tensile strength of the glue is 5.2MPa, ...

Embodiment 3

[0045] Set the molecular weight to 1.08×10 5 The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.5 mL of glycidyl ether dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the glycidyl ether evenly in the cellulose solution, and after 20 min, place the obtained glycidyl ether / cellulose mixed solution in Centrifuge and defoam at 0°C, and the resulting clear solution is spread on a glass plate by the continuous flow method. First place it in a windless environment at 20°C, and then put it into a coagulation bath of 2.5mol / L NaCl / water / ethylene glycol solution after 2 hours, wherein the mass ratio of water to ethylene glycol is 60 Ratio of 40, then put the coagulation bath into the refrigerator at 0°C and let ...

technical field

[0001] The invention relates to the field of natural polymer hydrogels, in particular to a transparent ion-conductive cellulose hydrogel and its preparation method and application. Background technique

[0002] With the development of modern science and technology, the status of renewable resources and environment-friendly resources in scientific research is becoming more and more important. Plant cellulose, as the most abundant natural polymer in nature, has always been an important direction of scientific research due to its renewability, degradability, biocompatibility, non-toxicity and other properties. Therefore, plant cellulose has broad application prospects in water treatment, wearable devices, flexible electronic materials, tissue engineering materials, etc.

[0003] At present, most of the traditional conductive hydrogels are composed of intrinsic conductive polymers and other hydrogel matrices, but due to the rigid chain structure of the conductiv...

Examples

Embodiment 1

[0041] Set the molecular weight to 1.08×10 5 The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.4 mL of epichlorohydrin dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the epichlorohydrin evenly in the cellulose solution, and mix the obtained epichlorohydrin / cellulose The mixed solution was degassed by centrifugation at 0 °C, and the obtained clear solution was spread on a glass plate by the continuous flow method. First put it in a windless environment at 20°C, put it in a coagulation bath of 1mol / L NaCl aqueous solution after 2 hours, and then put the coagulation bath in a refrigerator at 0°C for 24 hours, and the obtained cellulose ionized water coagulates The tensile strength of the adhesive is 2.5...

Embodiment 2

[0043] Set the molecular weight to 1.08×10 5The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.4 mL of epichlorohydrin dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the epichlorohydrin evenly in the cellulose solution, and mix the obtained epichlorohydrin / cellulose The mixed solution was degassed by centrifugation at 0 °C, and the obtained clear solution was spread on a glass plate by the continuous flow method. First put it in a windless environment at 20°C, put it in a coagulation bath of 3mol / L NaCl aqueous solution after 2 hours, and then put the coagulation bath in a refrigerator at 0°C for 24 hours, and the obtained cellulose ionized water coagulates The tensile strength of the glue is 5.2MPa, ...

Embodiment 3

[0045] Set the molecular weight to 1.08×10 5 The cotton linter cellulose is dispersed in 1.88mol / L benzyltrimethylammonium hydroxide aqueous solution, frozen at -24°C for 12 hours until the dispersion is completely frozen, then thawed at room temperature, centrifuged and defoamed to obtain a clear and transparent of cellulose solution. Add 0.5 mL of glycidyl ether dropwise to 15 g of cellulose solution, stir in an ice-water bath to disperse the glycidyl ether evenly in the cellulose solution, and after 20 min, place the obtained glycidyl ether / cellulose mixed solution in Centrifuge and defoam at 0°C, and the resulting clear solution is spread on a glass plate by the continuous flow method. First place it in a windless environment at 20°C, and then put it into a coagulation bath of 2.5mol / L NaCl / water / ethylene glycol solution after 2 hours, wherein the mass ratio of water to ethylene glycol is 60 Ratio of 40, then put the coagulation bath into the refrigerator at 0°C and let ...

Images