Preparation method of conductive polypyrrole hollow compound microsphere sensitive to temperature

Abstract

The invention discloses a preparation method of a conductive polypyrrole hollow compound microsphere which is sensitive to temperature, comprising the steps of: adopting a poly-(N-isopropylamide-styrene) compound microsphere prepared by a soap-free emulsion polymerization method as a core, synthesizing a poly(N-isopropylamide-methacrylic acid) shell with a cross-linked structure by a seed emulsion polymerization method, preparing a polypyrrole compound microsphere by an oxidation polymerization method, and preparing a polypyrrole hollow compound microsphere by adopting the polypyrrole compound microsphere as a template. The preparation method of the conductive polypyrrole hollow compound microsphere which is sensitive to temperature is simple in synthesizing method; the size of the obtained product is easy to control; the microsphere has large specific surface and obvious volume swelling effect; the cavity in the microsphere can contain large amount of guest molecules or macromoleculecarriers; and the cavity size, sensitivity and conductivity of the microsphere are adjustable.

Description

technical field

[0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of sensitive polypyrrole hollow microspheres. Background technique

[0002] At present, the preparation of conductive polypyrrole hollow microspheres mostly uses monodisperse silica microspheres or polystyrene microspheres as templates, and through appropriate surface modification or modification, the oxidation of polypyrrole is carried out on the surface of the modified template. Polymerize, and finally remove the core component to obtain polypyrrole hollow microspheres. This method for preparing polypyrrole hollow microspheres has disadvantages such as complicated surface modification process and single property of the prepared polypyrrole.

[0003] Composite polymer microgels with environmental sensitivity and conductive polymers in a certain way can obtain composite materials with both sensitive characteristics and conductive properties. T...

Examples

Embodiment 1

[0026] 1. Preparation of poly(N-isopropylacrylamide-styrene) copolymer microsphere dispersion

[0027] Under the protection of nitrogen, dissolve 0.2g of N-isopropylacrylamide monomer and 1.8g of styrene monomer in a 150mL three-neck flask filled with 90g of double-distilled water, stir at 400 rpm, and heat to 70°C in a water bath. Add 10.16g of potassium persulfate aqueous solution with a mass fraction of 1.57%, the mass ratio of N-isopropylacrylamide monomer to styrene monomer, double distilled water, and potassium persulfate aqueous solution is 1:9:450:50.8, and the temperature is constant After reacting for 8 hours, 102.16 g of poly(N-isopropylacrylamide-styrene) copolymerized microsphere dispersion liquid was prepared.

[0028] 2. Preparation of poly(N-isopropylacrylamide-styrene) / poly(N-isopropylacrylamide-methacrylic acid) core-shell composite microspheres

[0029]Under nitrogen protection, 0.96g N-isopropylacrylamide monomer, 0.23g methacrylic acid monomer, 0.094g sod...

Embodiment 2

[0036] In step 3 of preparing polypyrrole composite microspheres in this example, the pyrrole ethanol solution with a mass fraction of 1.8% was replaced with an equal mass fraction of 0.6% pyrrole ethanol solution, and other steps in this step were the same as in Example 1. The other steps were the same as in Example 1 to prepare polypyrrole hollow composite microspheres. The scanning electron micrographs of the prepared polypyrrole hollow composite microspheres are shown in figure 2 . Depend on figure 2 It can be seen that the prepared polypyrrole hollow composite microspheres have a red blood cell-like structure.

Embodiment 3

[0038] In step 3 of preparing polypyrrole composite microspheres in this embodiment, the pyrrole ethanol solution with a mass fraction of 1.8% was replaced with an equal mass fraction of 1.2% pyrrole ethanol solution, and other steps in this step were the same as in Example 1. The other steps were the same as in Example 1 to prepare polypyrrole hollow composite microspheres. The scanning electron micrographs of the prepared polypyrrole hollow composite microspheres are shown in image 3 . Depend on image 3 It can be seen that the prepared polypyrrole hollow composite microspheres have a red blood cell-like structure.

technical field

[0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of sensitive polypyrrole hollow microspheres. Background technique

[0002] At present, the preparation of conductive polypyrrole hollow microspheres mostly uses monodisperse silica microspheres or polystyrene microspheres as templates, and through appropriate surface modification or modification, the oxidation of polypyrrole is carried out on the surface of the modified template. Polymerize, and finally remove the core component to obtain polypyrrole hollow microspheres. This method for preparing polypyrrole hollow microspheres has disadvantages such as complicated surface modification process and single property of the prepared polypyrrole.

[0003] Composite polymer microgels with environmental sensitivity and conductive polymers in a certain way can obtain composite materials with both sensitive characteristics and conductive properties. T...

Examples

Embodiment 1

[0026] 1. Preparation of poly(N-isopropylacrylamide-styrene) copolymer microsphere dispersion

[0027] Under the protection of nitrogen, dissolve 0.2g of N-isopropylacrylamide monomer and 1.8g of styrene monomer in a 150mL three-neck flask filled with 90g of double-distilled water, stir at 400 rpm, and heat to 70°C in a water bath. Add 10.16g of potassium persulfate aqueous solution with a mass fraction of 1.57%, the mass ratio of N-isopropylacrylamide monomer to styrene monomer, double distilled water, and potassium persulfate aqueous solution is 1:9:450:50.8, and the temperature is constant After reacting for 8 hours, 102.16 g of poly(N-isopropylacrylamide-styrene) copolymerized microsphere dispersion liquid was prepared.

[0028] 2. Preparation of poly(N-isopropylacrylamide-styrene) / poly(N-isopropylacrylamide-methacrylic acid) core-shell composite microspheres

[0029]Under nitrogen protection, 0.96g N-isopropylacrylamide monomer, 0.23g methacrylic acid monomer, 0.094g sod...

Embodiment 2

[0036] In step 3 of preparing polypyrrole composite microspheres in this example, the pyrrole ethanol solution with a mass fraction of 1.8% was replaced with an equal mass fraction of 0.6% pyrrole ethanol solution, and other steps in this step were the same as in Example 1. The other steps were the same as in Example 1 to prepare polypyrrole hollow composite microspheres. The scanning electron micrographs of the prepared polypyrrole hollow composite microspheres are shown in figure 2 . Depend on figure 2 It can be seen that the prepared polypyrrole hollow composite microspheres have a red blood cell-like structure.

Embodiment 3

[0038] In step 3 of preparing polypyrrole composite microspheres in this embodiment, the pyrrole ethanol solution with a mass fraction of 1.8% was replaced with an equal mass fraction of 1.2% pyrrole ethanol solution, and other steps in this step were the same as in Example 1. The other steps were the same as in Example 1 to prepare polypyrrole hollow composite microspheres. The scanning electron micrographs of the prepared polypyrrole hollow composite microspheres are shown in image 3 . Depend on image 3 It can be seen that the prepared polypyrrole hollow composite microspheres have a red blood cell-like structure.

Images