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Porous organosilicon fibers and preparation method thereof

A silicone and fiber technology, applied in the field of porous silicone fiber and its preparation, can solve the problems of high density, low porosity, heat protection, heat preservation, and limited sound insulation effect, and achieve low density, high porosity, insulation good sound effect

Inactive Publication Date: 2010-11-03
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microporous structure can be obtained by high temperature treatment of organosilicon crosslinked polymers, such as the microporous organosilicon fiber disclosed in Chinese patent ZL200810030437.4 and its preparation method. Silicone polymer does not melt to form a large number of micropores in the fiber, but the material obtained by this method only contains micropores, does not contain mesopores, has low porosity, high density, and limited heat resistance, heat preservation and sound insulation effects

Method used

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  • Porous organosilicon fibers and preparation method thereof
  • Porous organosilicon fibers and preparation method thereof
  • Porous organosilicon fibers and preparation method thereof

Examples

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Embodiment 1

[0025] The porous polycarbosilane fibers of this embodiment have a chemical structure of an organic polymer with Si-C as the main chain, in a felt shape, with an average fiber diameter of 2.0 μm and a porosity of 85vol% (mesopores are 60vol%, micropores is 25vol%), and the specific surface area is 1500m 2 / g.

[0026] Preparation: (1) Dissolve 4.0g polycarbosilane in 5mL xylene to make a dilute solution with a concentration of 0.8g / mL, and add 3.0mL dimethyl sulfoxide dropwise while stirring to precipitate macromolecular polysilane and form Electrospinnable suspensions. (2) Use a syringe pump to inject the suspension into a metal nozzle with an inner diameter of 1.0mm at the extrusion speed of 0.010mL / min for electrospinning, wherein the positive voltage applied to the metal nozzle is 30kV, and the metal nozzle and The distance between the grounded receiving aluminum plates is 25 cm, and the electrospun fibers with a diameter of about 2.0 μm are collected on the receiving pl...

Embodiment 2

[0028] The porous polycarbosilane fibers of the present embodiment have a chemical structure of an organic polymer with Si-C as the main chain, in a felt shape, with an average fiber diameter of 4.0 μm and a porosity of 90vol% (mesopores are 70vol%, micropores 20vol%), the specific surface area is 1000m 2 / g.

[0029] Preparation: The only difference from Example 1 is that in step (1), 4.0 g of polycarbosilane was dissolved in 8 mL of tetrahydrofuran to prepare a dilute solution with a concentration of 0.5 g / mL.

Embodiment 3

[0031] The porous polycarbosilane fibers of the present embodiment have a chemical structure of an organic polymer with Si-C as the main chain, in a felt shape, with an average fiber diameter of 0.5 μm and a porosity of 88vol% (mesopores are 63vol%, micropores is 25vol%), and the specific surface area is 2000m 2 / g.

[0032] Preparation: The only difference from Example 1 is that in step (1), 4.0 g of polycarbosilane was dissolved in 4 mL of benzene to prepare a dilute solution with a concentration of 1.0 g / mL.

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Abstract

The invention discloses porous organosilicon fibers and a preparation method thereof. The chemical structure of the organosilicon fibers is organic polymer, the main chain of which is Si-C or Si-N, the fibers are felty, the diameter of the fibers is 0.5-4.0 mu m, the fibers are rich in mesopores and micropores, the porosity is greater than 80vol%, and the specific surface area is 1000-2000 m<2> / g. The preparation method is characterized in that organosilicon polymer suspension solution which can spin electrically is prepared by utilizing a precipitation fractionation principle, electrostatic spinning of the extremely dilute organosilicon polymer solution is realized, a large number of the mesopores are introduced, and then a large number of the micropores are introduced through an air non-melting cross-linking mechanism, a high-temperature small-molecule escaping mechanism and a high-temperature setting effect, thus obtaining the porous organosilicon polymer fibers the apertures of which have a wider distribution range. The porous organosilicon polymer fibers are rich in the mesopores and the micropores, have high heat resistance, stable apertures and good flexibility and have good application prospects in the fields such as energy storage, environment control, medical health, heat insulation and noise elimination and the like.

Description

technical field [0001] The invention relates to a porous material and a preparation method thereof, in particular to a porous organic silicon fiber and a preparation method thereof. Background technique [0002] Macroporous (pore diameter > 50nm) and mesoporous (2nm < pore diameter ≤ 50nm) materials are mainly used as catalyst carriers, filtering macromolecular substances, heat insulation, heat preservation, sound insulation materials, etc., while microporous materials (pore diameter ≤ 2nm) are mostly used It is used in the fields of adsorption, separation of small molecular substances and energy storage. Materials with both mesopores and micropores will take into account the advantages of both, and show good application prospects in the fields of adsorption catalysis, gas energy storage, thermal insulation and noise reduction. [0003] There are many preparation methods for mesoporous organic polymer materials, including self-assembly method, template method, adding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/76D01D1/02D01D5/00D01D10/02B01J32/00B01J31/06B01J35/10B01J35/06
Inventor 楚增勇程海峰王军邢欣周永江郑文伟王应德阎佳张东玖
Owner NAT UNIV OF DEFENSE TECH