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Method for synthesizing polypyrrole microcapsules

A technology of microcapsules and polypyrrole, which is applied in the field of polypyrrole synthesis, can solve problems such as the impact on human body and environment, the toxicity of chloroform, and its volatility, and achieve the effect of low cost, low price and easy purchase

Active Publication Date: 2016-02-17
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium persulfate is water-soluble, and the preparation of microcapsules with ammonium persulfate as the core material and polypyrrole as the shell material can only be prepared in an organic solvent, which has certain limitations. In capsules, iron ions are doped in, but the reaction with hydrogen peroxide is slow, time-consuming and low yield
"Preparation and characterization of microcapsules containing ammonium persulfate as core by insitu polymerization" (Chemical Engineering Journal 249 (2014) 27–33) and the patent literature named "A high-efficiency microcapsule gel breaker and its preparation method" (2012100810368) introduced ammonium persulfate as the core material and polypyrrole as the core material. The polypyrrole microcapsules prepared as the shell material, the above two preparation methods are carried out in the oil phase chloroform system, and because chloroform is toxic and volatile, it may have a certain impact on the human body and the environment

Method used

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  • Method for synthesizing polypyrrole microcapsules
  • Method for synthesizing polypyrrole microcapsules
  • Method for synthesizing polypyrrole microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 40mL of water, 4.0g of benzoyl peroxide, 0.20g of sodium lauryl sulfate, 0.32g of polyethylene glycol 2000 into a 100ml three-neck flask, add a small amount of butanol and ethanol dropwise, stir mechanically for 1 hour, then add Peracetic acid, adjust the pH of the solution to about 2, add the refrigerated pyrrole monomer dropwise, continue to stir for 4-6 hours, and finally get a black substance, remove the black substance, wash once with cyclohexane, and wash with absolute ethanol for 3 Once, vacuum-dried at 60°C for 24 hours to obtain the product. The obtained product was characterized by transmission, its dispersion performance was compared, and the encapsulation rate was measured. The encapsulation rate of microcapsules was 91.8%. Obtained microcapsules TEM see figure 1 shown.

Embodiment 2

[0033]Add 40mL water into a 100ml three-necked flask, add 3.8g benzoyl peroxide, 0.16g sodium lauryl sulfate, 0.34g polyethylene glycol 600, drop a small amount of butanol and ethanol, stir mechanically for 1 hour, then add Peracetic acid, adjust the pH of the solution to about 3, add the refrigerated pyrrole monomer dropwise, continue to stir for 4-6 hours, and finally obtain a black substance, remove the black substance, wash once with cyclohexane, and wash with absolute ethanol for 3 Once, vacuum-dried at 60°C for 24 hours to obtain the product. The obtained product was characterized by transmission, its dispersion performance was compared, and the encapsulation rate was measured. The encapsulation rate of microcapsules was 90.1%. Obtained microcapsules TEM see figure 2 shown.

Embodiment 3

[0035] Add 40mL water into a 100ml three-necked flask, add 3.7g benzoyl peroxide, 0.24g sodium lauryl sulfate, 0.28g polyethylene glycol 600, drop a small amount of butanol and ethanol, stir mechanically for 1 hour, then add Peracetic acid, adjust the pH of the solution to about 4, add the refrigerated pyrrole monomer dropwise, continue to stir for 4-6 hours, and finally obtain a black substance, remove the black substance, wash once with cyclohexane, and wash with absolute ethanol for 3 Once, vacuum-dried at 60°C for 24 hours to obtain the product. The obtained product was characterized by transmission, its dispersion performance was compared, and the encapsulation rate was measured. The encapsulation rate of microcapsules was 89.5%. Obtained microcapsules TEM see image 3 shown.

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Abstract

The invention relates to the technical field of polypyrrole synthesis and polypyrrole microcapsule synthesis, in particular to a method for synthesizing polypyrrole microcapsules. The method includes the steps that benzoyl peroxide, lauryl sodium sulfate and polyethylene glycol 2000 are mixed with deionized water, then a small amount of butanol and a small amount of ethyl alcohol are added, after stirring is carried out, peracetic acid is used for adjusting the mixed system to be strongly acidic, pyrrole monomers are added and stirred for reacting to obtain a black solid, and the black solid is washed with cyclohexane and absolute ethyl alcohol and dried in a vacuum mode to obtain the polypyrrole microcapsules. The method is low in cost and energy consumption and high in use ratio, and a wrapped core material can be released in oily solvent to serve as initiator of emulsion polymerization.

Description

technical field [0001] The invention relates to the synthesis of polypyrrole and the technical field of synthesis of polypyrrole microcapsules, in particular to the synthesis of polypyrrole by chemical oxidation and the synthesis of polypyrrole microcapsules by in-situ polymerization. Background technique [0002] Polypyrrole is neither soluble in water nor soluble in most organic solvents. Because of this special property, polypyrrole has been widely used in many aspects. Polypyrrole can be used in biology, ion detection, supercapacitor and antistatic materials. And the modified electrode of photoelectrochemical cell and the electrode material of storage battery. It can also be used as electromagnetic shielding material and gas separation membrane material for electrolytic capacitors, electrocatalysis, and conductive polymer composite materials. The biggest advantage of microcapsules prepared with polypyrrole as the shell material is that polypyrrole microcapsules can be p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G61/12
Inventor 刘天晴周国强王元有
Owner YANGZHOU UNIV
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