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Method for preparing polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as template

A bacterial cellulose and nano-conductive technology, which is applied in the field of preparation of polypyrrole-coated bacterial cellulose nano-conductive composite materials, can solve the problems of low electrical conductivity, poor mechanical properties, and limited polypyrrole in composite materials, and achieve excellent mechanical properties. Performance, low cost, evenly distributed effect

Active Publication Date: 2011-10-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on conductive polymer nanoconductive composites based on bacterial cellulose, and the latest reports have the disadvantage of low electrical conductivity of synthetic composites (③. D. Müller, C. R. Rambo, D. O. S. Recouvreux, L. M. Porto , G. M. O. Barra. Chemical in situ polymerization of polypyrrole on bacterial cellulose nanofibers. Synth. Met., 2011, 161,106-111. )
Polypyrrole is one of the most promising conductive polymers at present. It has the advantages of high conductivity, easy access to raw materials, controllable structure and properties, simple synthesis, and good environmental stability. However, it has poor mechanical properties and poor processability. Difficulties limit the application of polypyrrole

Method used

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  • Method for preparing polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as template
  • Method for preparing polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as template
  • Method for preparing polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as template

Examples

Experimental program
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Embodiment 1

[0024] Implementation example 1: the preparation method of polypyrrole-coated bacterial cellulose nano-conductive composite material of the present invention may further comprise the steps:

[0025] In the first step, soak the native dynamically fermented bacterial cellulose nanofibers in deionized water and boil for 3 h, then add 1 mol / L NaOH solution and boil for 90 min, then wash with deionized water until neutral, centrifuge for 20 min Prepare 80% wet bacterial cellulose (stored in a refrigerator at 4°C);

[0026] In the second step, weigh 0.49 g (or 0.24 g, 2.42 g, 4.85 g) of wet bacterial cellulose, add 3 mL of deionized water, and stir to disperse the bacterial cellulose evenly;

[0027] In the third step, add pyrrole (1 mL) and DMF (1.5 mL) to the suspension in the second step in turn, and stir to make the pyrrole fully diffuse into the bacterial cellulose network;

[0028] In the fourth step, the reaction system in the third step was cooled and kept at 0°C, and a mix...

Embodiment 2

[0030] Implementation example 2: the preparation method of polypyrrole-coated bacterial cellulose nano-conductive composite material of the present invention may further comprise the steps:

[0031] In the first step, soak the native dynamically fermented bacterial cellulose nanofibers in deionized water and boil for 3 h, then add 1 mol / L NaOH solution and boil for 90 min, then wash with deionized water until neutral, centrifuge for 20 min Prepare 80% wet bacterial cellulose (stored in a refrigerator at 4°C);

[0032] In the second step, weigh 0.49 g of wet bacterial cellulose, add deionized water (3 mL), and stir to disperse the bacterial cellulose evenly;

[0033] In the third step, add pyrrole (1 mL) and DMF (1.5 mL) to the suspension in the second step in turn, and stir to make the pyrrole fully diffuse into the bacterial cellulose network;

[0034]In the fourth step, the reaction system in the third step was cooled and kept at 0°C, and a mixture of FeCl3 (1.14 g or 0.57 ...

Embodiment 3

[0036] Implementation example 3: the preparation method of polypyrrole-coated bacterial cellulose nano-conductive composite material of the present invention comprises the following steps:

[0037] In the first step, soak the native dynamically fermented bacterial cellulose nanofibers in deionized water and boil for 3 h, then add 1 mol / L NaOH solution and boil for 90 min, then wash with deionized water until neutral, centrifuge for 20 min Prepare 80% wet bacterial cellulose (stored in a refrigerator at 4°C);

[0038] In the second step, weigh 0.49 g of wet bacterial cellulose, add deionized water (3 mL), and stir to disperse the bacterial cellulose evenly;

[0039] In the third step, add pyrrole (1 mL) and DMF (1.5 mL, or 0 mL, 3 mL, 4.5 mL, 6 mL) to the suspension in the second step, and stir to make the pyrrole fully diffuse into the bacterial cellulose network;

[0040] In the fourth step, the reaction system in the third step was cooled and kept at 0°C, and a mixture of F...

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Abstract

The invention discloses a method for preparing a polypyrrole coated bacterial cellulose nanometer electric-conduction composite material by utilizing bacterial cellulose as a template; impurity removal is carried out on protogenetic dynamically-fermented bacterial cellulose nanometer fiber, so as to obtain moist bacterial cellulose after pretreatment; the moist bacterial cellulose is arranged in deionized water for uniform dispersion; dimethylformamide and pyrrole monomers are added and stirred to enable the pyrrole monomer to be fully dispersed into a bacterial cellulose network; and a mixed solution of oxidant and doping agent is added for carrying out in-situ oxidation polymerization, and an obtained crude product is washed by acetone (ethanol), deionized water and hydrochloric acid solution sequentially and repeatedly, and then is frozen and dried, so as to obtain a finished product. The nanometer electric-conduction composite material obtained by the invention has higher electric conduction efficiency, lower cost, mild reaction and low toxicity.

Description

technical field [0001] The invention belongs to the technology of in-situ polymerizing and coating nano-conductive polymers on nanofibers, and in particular relates to a preparation method of polypyrrole-coated bacterial cellulose nano-conductive composite materials. Background technique [0002] With the development of economy, social progress and population growth, the world's energy consumption is increasing, while fossil energy is limited and environmental pollution is serious, the development of clean, efficient and sustainable new energy has become a very urgent task . Proton Exchange Membrane (Proton Exchange Membrane, PEM) Fuel Cell (Fuel Cell, FC) is such a new energy source, which uses renewable hydrogen energy and can achieve zero emissions. PEMFC is characterized by fast start-up speed, low operating temperature (~70-90°C), high specific power, simple structure, convenient maintenance and environmental friendliness. It can be used in electric vehicles, mobile co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/04C08L1/02C08G73/06
Inventor 唐卫华王欢欢唐键周培培孙东平
Owner NANJING UNIV OF SCI & TECH
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