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A kind of powdery polystyrene airgel and its preparation method and application

A polystyrene and aerogel technology, applied in chemical instruments and methods, and other chemical processes, can solve problems such as limited application prospects, wide particle size distribution, and poor sphericity, so as to expand the application range and simplify the application process , good effect of monodispersity

Active Publication Date: 2016-04-06
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For each sol in growth, whether it is the number of molecules participating in the reaction or the way of covalent stacking of reacting molecules into balls, there is strong randomness and poor controllability, which leads to the ubiquity of current organic aerogels. Obvious common defects, namely poor sphericity and wide particle size distribution
And the aerogels prepared by this method are usually massive, which greatly limits its application prospects

Method used

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  • A kind of powdery polystyrene airgel and its preparation method and application
  • A kind of powdery polystyrene airgel and its preparation method and application
  • A kind of powdery polystyrene airgel and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1: the preparation of a kind of powdery polystyrene airgel

[0050] (1) Add 18.3g of P123 (purchased from Aladdin Reagent Company) and 160ml of distilled water into a 250ml four-necked flask, and stir until P123 is completely dissolved to obtain an aqueous solution of P123.

[0051](2) Nitrogen was blown into the obtained solution. After 30 minutes, 4.0 g of St monomer (produced by Shanghai Reagent Factory) and 0.4 g of pre-crosslinking agent DVB (purchased from Aladdin Reagent Company) were mixed, and the obtained solution was added dropwise with a 10 ml syringe. After the solution was uniformly dispersed by mechanical stirring, the reaction temperature was set at 70°C, and after the temperature stabilized, 0.04g of AIBN was added, stirred and heated to reflux at a stirring rate of 270r / min, and free radical polymerization was carried out for 3h.

[0052] (3) After the reaction is completed, add the obtained microemulsion into 500ml of methanol, let it stand...

Embodiment 2

[0060] Embodiment 2: the preparation of a kind of powdery polystyrene airgel

[0061] (1) Add 12.4g of P123 and 160ml of distilled water into a 250ml four-necked flask, and stir until P123 is completely dissolved to obtain an aqueous solution of P123.

[0062] (2) Introduce nitrogen gas into the obtained solution. After 30 minutes, mix 4.0g St monomer with 0.4g pre-crosslinking agent DVB, add the obtained solution dropwise with a 10ml syringe, mechanically stir and disperse evenly, and set the reaction temperature to 70 ℃, after the temperature stabilized, 0.04g AIBN was added, stirred and heated to reflux at a stirring rate of 270r / min, and free radical polymerization was carried out for 3h.

[0063] (3) After the reaction is completed, add the obtained emulsion into 500ml of methanol, let it stand until the white flocs are separated from the supernatant, centrifuge the flocs, wash and dry at 50°C for 12 hours to obtain monodisperse pre-crosslinked PS nanospheres.

[0064] ...

Embodiment 3

[0069] Embodiment 3: the preparation of a kind of powdery polystyrene airgel

[0070] (1) Add 8.7g of P123 and 160ml of distilled water into a 250ml four-necked flask, and stir until P123 is completely dissolved to obtain an aqueous solution of P123.

[0071] (2) Introduce nitrogen gas into the obtained solution. After 30 minutes, mix 4.0g St monomer with 0.4g pre-crosslinking agent DVB, add the obtained solution dropwise with a 10ml syringe, mechanically stir and disperse evenly, and set the reaction temperature to 70 ℃, after the temperature stabilized, 0.04g AIBN was added, stirred and heated to reflux at a stirring rate of 270r / min, and free radical polymerization was carried out for 3h.

[0072] (3) After the reaction is completed, add the obtained emulsion into 500ml of methanol, let it stand until the white flocs are separated from the supernatant, centrifuge the flocs, wash and dry at 50°C for 12 hours to obtain monodisperse pre-crosslinked PS nanospheres.

[0073] (...

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Abstract

The invention belongs to the technical field of an aerogel material and discloses a powdery polystyrene aerogel, as well as a preparation method and an application thereof. The powdery polystyrene aerogel has a grain size of 0.4-4.0mu m and is formed by monodispersed pre-crosslinked PS nanometer balls of which the nanometer built unit has a grain size of 30-160nm by means of covalent stacking; the specific surface area is 201-608 m<2> / g; the total pore volume is 0.08-0.26 cm<3> / g. The polystyrene aerogel disclosed by the invention has a novel and specific monodispersed nanometer ball network unit, the grain size is 20-220 nm; the PDIs are all below 0.08, so that the nanometer network structure can be precisely built, and the inside of the ball is rich in three-dimensional network type micropores, thereby being beneficial to full utilization of the space and generation of new performances. The aerogel obtained in the invention is micron-level powder, can be directly used without being ball-milled in lots of application fields, has enlarged application range, and is beneficial to simplification of an application technique.

Description

technical field [0001] The invention belongs to the technical field of airgel materials, in particular to a powdered polystyrene airgel and its preparation method and application. Background technique [0002] Organic airgel is a new class of materials with a three-dimensional nano-network structure. The structural advantages such as interconnected pores have broad application prospects in the fields of adsorption, separation, energy, catalysis, and the environment. However, the current design concept of the nanoparticle network unit of organic aerogels is based on the solification reaction, which is essentially the polycondensation reaction of organic small molecular monomers or the random crosslinking reaction of macromolecular chains. For each sol in growth, whether it is the number of molecules participating in the reaction or the way of covalent stacking of reacting molecules into balls, there is strong randomness and poor controllability, which leads to the ubiquity o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/08C08F212/08C08F8/12C08F2/24C08J3/24B01J20/26
Inventor 吴丁财许静符若文
Owner SUN YAT SEN UNIV