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Morphology-controllable magnetic polymer microspheres and preparation method thereof

A technology of polymer and polymer solution, applied in the field of electrospinning, can solve the problems of reduced specific surface area, reduced group, small diameter, etc., and achieves the effects of mild reaction conditions, simple operation and low cost

Inactive Publication Date: 2018-01-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the most difficult problems facing polymer magnetic microspheres at present is the relationship between magnetism and particle size of polymer microspheres: the easiest way to enhance the magnetic properties of polymer magnetic microspheres is to increase the diameter of the microspheres, but when the diameter of the microspheres changes Larger, its specific surface area will decrease, which in turn will lead to a decrease in the number of groups available for functionalization on its surface
Although the small diameter microspheres have a large specific surface area, their magnetism is weak, and a large external magnetic field needs to be applied.
Therefore, the current problem to be solved is to prepare polymer magnetic microspheres with small diameter and strong magnetism.

Method used

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  • Morphology-controllable magnetic polymer microspheres and preparation method thereof
  • Morphology-controllable magnetic polymer microspheres and preparation method thereof
  • Morphology-controllable magnetic polymer microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Prepare polyacrylonitrile magnetic microspheres under the conditions of polyacrylonitrile (PAN) solution mass volume fraction 3%, voltage 12KV, spray rate 0.3ml / h, receiving distance 10cm, needle inner diameter 0.5mm, solvothermal reaction time 4h .

[0030] (1) Dissolve 0.09 g of polyacrylonitrile in 3 ml of N,N-dimethylformamide (DMF), stir until the solution is clear, and obtain a spinning solution with a mass fraction of 3%.

[0031] (2) The above solution is electrostatically sprayed using an electrospinning device. The electrostatic spraying conditions are: voltage 12KV, spray rate 0.3ml / h, receiving distance 10cm, needle inner diameter 0.5mm, and collect the resulting product with tin foil, such as figure 1 Shown is the SEM image of the prepared polymer microspheres.

[0032] (3) Put 0.1g of diethylene glycol (DEG) into a beaker, place the beaker in a water bath at 80°C for stirring and heating, weigh 0.5g of anhydrous ferric chloride, and add it to DE...

Embodiment 2

[0033] Example 2: Polyacrylonitrile magnetic microspheres were prepared under the conditions of 4% PAN solution mass volume fraction, voltage 12KV, spray rate 0.4ml / h, receiving distance 10cm, needle inner diameter 0.5mm, and solvothermal reaction time 10h.

[0034] (1) Dissolve 0.12g of PAN in 3ml of DMF, stir until the solution is clear, and obtain a spinning solution with a mass fraction of 4%.

[0035] (2) The above solution was electrostatically sprayed using an electrospinning device. The electrostatic spraying conditions were: voltage 12KV, spray rate 0.4ml / h, receiving distance 10cm, needle inner diameter 0.5mm, and collected the product with tinfoil.

[0036] (3) Put 0.01g of diethylene glycol (DEG) into a beaker, place the beaker in a water bath at 80°C for stirring and heating, weigh 0.06g of anhydrous ferric chloride, add it into DEG under continuous stirring to form a homogeneous phase solution, and then weighed 0.35g of anhydrous sodium acetate and added to the o...

Embodiment 3

[0037] Example 3 The polyacrylonitrile magnetic microspheres were prepared under the parameter conditions of 5% PAN solution mass volume fraction, voltage 12KV, spray rate 0.3ml / h, receiving distance 10cm, needle inner diameter 0.5mm, and solvothermal reaction time 14h.

[0038] (1) Dissolve 0.15 g of PAN in 3 ml of DMF and stir until the solution is clear to obtain a spinning solution with a mass fraction of 5%.

[0039] (2) The above solution was electrostatically sprayed using an electrospinning device. The electrostatic spraying conditions were: voltage 12KV, spray rate 0.3ml / h, receiving distance 10cm, needle inner diameter 0.5mm, and collected the product with tinfoil.

[0040] (3) Put 0.0060g of diethylene glycol (DEG) into a beaker, place the beaker in a water bath at 80°C for stirring and heating, weigh 0.0300g of anhydrous ferric chloride, add it into DEG under continuous stirring to form a homogeneous phase solution, and then weighed 0.0600g of anhydrous sodium acet...

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Abstract

The invention discloses a method for preparing magnetic polymer microspheres with controllable morphologies. The method mainly comprises the following steps: preparing a polymer solution; then preparing the polymer microspheres by electrostatic spraying; and then reacting the components at high temperature so that the surfaces of the polymer microspheres are coated with the ferroferric oxide magnetic nanoparticles to obtain the magnetic polymer microspheres. The method is used for preparing the polymer microspheres with different morphologies by controlling the electrostatic spraying process conditions, and then the surfaces of the polymer microspheres are coated with the generated magnetic Fe3O4 having different masses, so that the magnetic polymer microspheres with different morphologiesand controllable magnetic intensity can be obtained. The preparation method with controlled morphology has simple process, and can easily realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrospinning, and in particular relates to the preparation of magnetic polymer microspheres with controllable morphology. Background technique [0002] As a new type of functional material, polymer magnetic microspheres are an organic-inorganic composite material composed of magnetic nanoparticles and polymer framework materials, and have many unique physical and chemical properties. On the one hand, due to the magnetic orientation of the composite nanoparticles on the microspheres, the polymer magnetic microspheres can move with the change of the external magnetic field, so that the microspheres can be quickly integrated with the system. On the other hand, the organic surface of the framework material of polymer microspheres can be modified by chemical methods, so that the surface is rich in a large number of functional groups (such as -OH, -NH 2 , -COOH, -SH, -CHO), so that the magnetic microspheres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02H01F1/42C08L33/20C08K3/22
Inventor 冯章启李家城代宇
Owner NANJING UNIV OF SCI & TECH