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Monodisperse polymer porous microsphere and preparation method thereof

A technology of porous microspheres and polymers, which is applied in the field of monodisperse polymer porous microspheres and their preparation, can solve the problems of pore collapse, difficulty in removing templates completely, and difficulty in realizing individual regulation of polymer porous microspheres, and achieves macropore size. The effect of size

Active Publication Date: 2021-06-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the problems that the prior art is difficult to realize the separate regulation and control of the particle size and pore size of polymer porous microspheres, it is difficult to prepare a pore structure with a large pore size, and it is easy to cause pore collapse by relying on template pore formation, and provides a monodisperse polymer porous microsphere Microspheres and their preparation methods to achieve low-cost preparation of large-pore, monodisperse polymer porous microspheres, while avoiding the problems of difficult template removal and pore collapse, and to achieve independent regulation of particle size and pore size

Method used

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  • Monodisperse polymer porous microsphere and preparation method thereof
  • Monodisperse polymer porous microsphere and preparation method thereof
  • Monodisperse polymer porous microsphere and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0057] In this embodiment, monodisperse polystyrene (PS) solid microspheres are used as the particles of polymer A, and polyvinylpyrrolidone (PVP) is used as polymer B to prepare monodisperse PS porous microspheres, which specifically include the following steps :

[0058] (1) Preparation of blend

[0059] Weigh 3.0g of PVP, measure 30mL of distilled water, dissolve PVP in water to form a PVP aqueous solution; weigh 0.9g of monodisperse PS solid microspheres with a particle size of 10.0±0.2μm, and fully disperse the PS solid microspheres in the PVP aqueous solution , and then dry the water to obtain the PS solid microsphere / PVP blend.

[0060] (2) High-pressure fluid foaming

[0061] Place the PS solid microsphere / PVP blend obtained in step (1) in an autoclave, feed carbon dioxide into the autoclave as a foaming agent, control the pressure in the autoclave to 30MPa and the temperature to 60°C, and maintain the aforementioned pressure and temperature Condition 1h, the foamin...

Embodiment 2

[0066] In this embodiment, monodisperse PS solid microspheres are used as the particles of polymer A, and PVP is used as polymer B to prepare monodisperse PS porous microspheres, which specifically include the following steps:

[0067] (1) Preparation of blend

[0068] Weigh 3.0g of PVP, measure 30mL of distilled water, dissolve PVP in water to form a PVP aqueous solution; weigh 0.9g of monodisperse PS solid microspheres with a particle size of 10.0±0.2μm, and fully disperse the PS solid microspheres in the PVP aqueous solution , and then dry the water to obtain the PS solid microsphere / PVP blend.

[0069] (2) High-pressure fluid foaming

[0070] Place the PS solid microsphere / PVP blend obtained in step (1) in an autoclave, feed nitrogen into the autoclave as a foaming agent, control the pressure in the autoclave to be 3MPa, and the temperature to be room temperature, and maintain the aforementioned pressure and temperature conditions After 24 hours, the foaming agent reache...

Embodiment 3

[0075] In this example, monodisperse PS solid microspheres are used as the particles of polymer A, and PVP is used as polymer B to prepare monodisperse PS porous microspheres. The PS porous microspheres have a hierarchical porous structure, specifically including the following step:

[0076] (1) Preparation of blend

[0077] Weigh 3.0g of PVP, measure 30mL of distilled water, dissolve PVP in water to form a PVP aqueous solution; weigh 0.9g of monodisperse PS solid microspheres with a particle size of 500.0±5.0μm, and fully disperse the PS solid microspheres in the PVP aqueous solution , and then dry the water to obtain the PS solid microsphere / PVP blend.

[0078] (2) High-pressure fluid foaming

[0079] Place the PS solid microsphere / PVP blend obtained in step (1) in an autoclave, feed nitrogen into the autoclave as a foaming agent, control the pressure in the autoclave to 15MPa, and the temperature to 100°C, and maintain the aforementioned pressure and temperature Conditio...

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Abstract

The invention provides a monodisperse polymer porous microsphere and a preparation method thereof, the porous microsphere takes a thermoplastic polymer as a matrix, the interior and the surface of the porous microsphere have pore structures, and the preparation method comprises the following steps: (1) preparing a blend of particles of a polymer A and a polymer B, or a blend of particles of the polymer A, the polymer B and a functional filler, (2) foaming the obtained blend by adopting a pressure relief method or a temperature rise method, and (3) placing the obtained foamed material in an etching solvent, etching to remove the polymer B, and carrying out solid-liquid separation, washing and drying to obtain the monodisperse polymer porous microspheres. According to the method, low-cost preparation of the large-aperture monodisperse polymer porous microspheres can be realized, meanwhile, the problems that a template is difficult to completely remove and a pore channel collapses can be avoided, and independent regulation and control of the particle size and the aperture can be realized.

Description

technical field [0001] The invention belongs to the field of polymer porous microspheres, and relates to monodisperse polymer porous microspheres and a preparation method thereof. Background technique [0002] Polymer porous microspheres refer to polymer microspheres with pores on the surface, or on the surface and inside. Compared with polymer solid microspheres, polymer porous microspheres have lower density and higher specific surface area, making them widely favored in the fields of biomedicine, catalysis, and wastewater treatment. The pore structure on the surface of polymer porous microspheres can also change the surface roughness and light scattering properties of the microspheres. At present, the literature has reported the application of polymer porous microspheres in the fields of sustained drug release, photoelectric materials, and superphilic / hydrophobic materials. [0003] In the prior art, the methods for preparing polymer porous microspheres mainly include p...

Claims

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Application Information

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IPC IPC(8): C08L39/06C08L25/06C08L71/02C08L33/12C08L29/04C08L23/12C08L67/04C08L77/02C08L75/04C08J9/12C08J9/14
CPCC08J9/122C08J9/141C08J2203/06C08J2339/06C08J2425/06C08J2205/05C08J2371/02C08J2433/12C08J2329/04C08J2203/14C08J2325/06C08J2423/12C08J2467/04C08J2377/02C08J2475/04
Inventor 廖霞吕翠芳邹芳芳李光宪
Owner SICHUAN UNIV
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