Secondarily doped graphene oxide/alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel prepared by one-pot method

Abstract

The invention discloses a double-doped graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel prepared by a one-pot method. The method firstly polymerizes aniline, phytic acid and ammonium persulfate to obtain polyaniline, and dissolves it for later use; then dissolves chitosan powder in a mixed aqueous solution of lithium hydroxide monohydrate, urea and graphene oxide to obtain graphene oxide / Alkali-soluble chitosan solution; adding polyaniline / N-methylpyrrolidone solution, acrylamide, N,N'-methylenebisacrylamide, and ammonium persulfate in turn, and polymerizing to obtain a composite hydrogel; transferring to phytic acid solution secondary doping is performed in the middle to obtain a high-strength graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel material. The secondary doping process can improve the electrical conductivity of the hydrogel and adjust the mechanical properties of the gel. Due to its excellent mechanical properties and electrical conductivity, this material is expected to be used in electronic skin, flexible electronic devices and other fields.

Description

technical field

[0001] The invention belongs to the field of conductive hydrogel preparation, in particular to a secondary doped graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel prepared by a one-pot method and a preparation method thereof. Background technique

[0002] Smart materials with the skin-like ability to stretch, sense and bend have found diverse applications in interacting with the human body. Conductive hydrogels are considered to be useful in the preparation of flexible electronic skin materials due to their high water content and similar structure to human soft tissue. Many existing conductive hydrogel materials are prepared from conductive polymers as raw materials. Because polyaniline has the characteristics of easy availability of raw materials, simple synthesis process, good chemical and environmental stability, etc., it has been widely used in this field. However, the processing performance and film-forming...

Examples

example 1

[0020] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0021] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0022] 3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acr...

example 2

[0026] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0027] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0028] 3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acr...

example 3

[0032] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0033] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0034]3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acry...

technical field

[0001] The invention belongs to the field of conductive hydrogel preparation, in particular to a secondary doped graphene oxide / alkali-soluble chitosan-polyaniline-polyacrylamide composite conductive hydrogel prepared by a one-pot method and a preparation method thereof. Background technique

[0002] Smart materials with the skin-like ability to stretch, sense and bend have found diverse applications in interacting with the human body. Conductive hydrogels are considered to be useful in the preparation of flexible electronic skin materials due to their high water content and similar structure to human soft tissue. Many existing conductive hydrogel materials are prepared from conductive polymers as raw materials. Because polyaniline has the characteristics of easy availability of raw materials, simple synthesis process, good chemical and environmental stability, etc., it has been widely used in this field. However, the processing performance and film-forming...

Examples

example 1

[0020] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0021] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0022] 3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acr...

example 2

[0026] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0027] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0028] 3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acr...

example 3

[0032] 1) Weigh each component according to mass percentage: 5% aniline monomer, 8% phytic acid, add water to form a solution, stir evenly, then add 0.5% ammonium persulfate initiator to initiate aniline polymerization; the reaction ends after 4 hours , using deionized water to dialyze polyaniline to a pH value of ≈7, suction filter, and dry; finally use N-methylpyrrolidone to dissolve polyaniline (polyaniline concentration is 0.1%), and set aside;

[0033] 2) take each component according to mass percentage: chitosan 2%, lithium hydroxide monohydrate 8%, urea 6%, graphene oxide 0.15%, all the other are water; Described chitosan molecular weight is 2000000; After the above components are mixed and swollen, a graphene oxide / alkali-soluble chitosan solution is obtained through multiple freezing-thawing processes;

[0034]3) Take 20ml of the graphene oxide / alkali-soluble chitosan solution prepared in step 2), add 5ml of 0.01wt% polyaniline / N-methylpyrrolidone solution, 3g of acry...