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Method for preparing polythiofuran in water-based medium

A polythiophene and water-based technology, applied in the field of polythiophene preparation, can solve problems such as environmental pollution and hindering the application and development of polythiophene, and achieve the effect of smooth polymerization reaction and improved solubility

Inactive Publication Date: 2011-02-16
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above methods involve the use of a large amount of organic solvents, which inevitably produces environmental pollution, which will hinder the application and development of polythiophene with the increasingly stringent emission regulations on organic solvents.
Therefore, there is an increasing need to develop a method that can carry out the polymerization of thiophene in a more environmentally friendly medium, thereby solving the environmental pollution problem caused by the use of organic solvents in the prior art methods

Method used

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  • Method for preparing polythiofuran in water-based medium
  • Method for preparing polythiofuran in water-based medium
  • Method for preparing polythiofuran in water-based medium

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Preparation of Polythiophene in Aqueous Medium (Method 1)

[0049] In a clean three-necked flask, add 30 mL of deionized water, 1.64 g (0.0045 mol) of cetyltrimethylammonium bromide and 2.5 mL (0.031 mol) of thiophene, and ultrasonicate for 30 minutes to make the system uniform. Dissolve 8.26g (0.036mol) of ammonium persulfate in 20mL of deionized water, drop it into a three-neck flask, heat it to 70°C while stirring, condense and reflux, and react for 24 hours, the system turns black. The reacted mixed system was filtered, washed with methanol / water (volume ratio 1:1) until the washing liquid was colorless, and lyophilized to obtain 1.43 g of black powder (yield 53.8%).

Embodiment 2

[0051] Preparation of Polythiophene in Aqueous Medium (Method 2)

[0052] In a clean three-neck flask, add 30 mL of deionized water, 1.45 g (0.0045 mol) of tetra-n-butylammonium bromide and 2.5 mL (0.031 mol) of thiophene, and ultrasonicate for 30 minutes to make the system uniform. Dissolve 8.26g (0.036mol) of ammonium persulfate in 20mL of deionized water, drop it into a three-neck flask, heat it to 70°C while stirring, condense and reflux, and react for 24 hours, the system turns black. The reacted mixed system was filtered, washed with methanol / water (volume ratio 1:1) until the washing liquid was colorless, and lyophilized to obtain 1.38 g of black powder (yield 52.2%).

Embodiment 3

[0054] Preparation of Polythiophene in Aqueous Medium (Method 3)

[0055] In a clean three-necked flask, add 30 mL of deionized water, 1.2 mL (0.0045 mol) of polyethylene glycol 300 and 2.5 mL (0.031 mol) of thiophene, and ultrasonicate for 30 minutes to make the system uniform. Dissolve 8.26g (0.036mol) of ammonium persulfate in 20mL of deionized water, drop it into a three-neck flask, heat it to 70°C while stirring, condense and reflux, and react for 24 hours, the system turns black. The reacted mixed system was filtered, washed with methanol / water (volume ratio 1:1) until the washing liquid was colorless, and freeze-dried to obtain 0.94 g of black powder (yield 35.5%).

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Abstract

The invention relates to a method for preparing polythiophene. In the method, the following components are adopted: a) thiophene with structure as shown in the following formula (I), b) at least one water soluble oxidant, c) if necessary, one or more reductants which can constitute a water soluble oxidation-reduction system with the component b), d) at least one phase transfer catalyst, and e) ifnecessary, one or more surfactants, which occurs a polymerization reaction in a water-based medium. The method has the advantages of simple operation, available reagents and reduced environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing polythiophene, in particular to a method for preparing polythiophene in a water-based medium. Background technique [0002] Since polythiophene was successfully prepared for the first time in 1980, as an important class of conjugated conductive polymers in nonlinear optical devices (Japanese patent JP10319451), electromagnetic shielding materials (Chinese patent 1949962), conductive coatings (Chinese patent CN1175610), photovoltaic cells ( European patent EP1079397), microwave absorbing material (World Intellectual Property Organization WO9301247), imaging material (European patent EP1398336), electroluminescent material (Chinese patent CN1740266) and other aspects have a wide range of applications. [0003] Polymerization of thiophene can be achieved in many ways, mainly in the following three ways: (1) electrochemical polymerization, (2) metal-catalyzed coupling reaction, (3) chemical oxidation polymeri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G61/12
Inventor 刘正平刘若尘黄俐研
Owner BEIJING NORMAL UNIVERSITY