Method for preparing aerogel

An aerogel and hydrogel technology, applied in the field of preparation of β-cyclodextrin-based polymer aerogels, can solve problems such as few reports, and achieve the effects of low cost, flexible and simple process, and large specific surface area.

Active Publication Date: 2017-06-13
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the development and

Method used

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  • Method for preparing aerogel
  • Method for preparing aerogel
  • Method for preparing aerogel

Examples

Experimental program
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Embodiment 1

[0029] (1) An appropriate amount of β-cyclodextrin was completely dissolved in deionized water at 90°C, recrystallized twice, and then dried at 105°C to constant weight.

[0030] (2) Weigh 2 g of recrystallized and dried β-cyclodextrin, and simultaneously weigh an appropriate amount of epichlorohydrin, sodium hydroxide and polyethylene glycol in proportion. Add β-cyclodextrin into the sodium hydroxide solution, stir magnetically at 55-60°C until completely dissolved; then add polyethylene glycol into the solution, stir magnetically at 55-60°C until completely dissolved; finally Add epichlorohydrin dropwise, and stir magnetically at 55-60° C. until a hydrogel is formed. In the above solution system, the ratio of the amount of glucose units of β-cyclodextrin to the amount of epichlorohydrin is 1:1, the ratio of the amount of matter of polyethylene glycol to β-cyclodextrin is 1:3, The ratio of epichlorohydrin to sodium hydroxide is 1:1, the molecular weight of polyethylene glyco...

Embodiment 2

[0034] In this example, the molecular weight of polyethylene glycol is 1000; the ratio of the glucose unit of β-cyclodextrin to the amount of epichlorohydrin is 1:2; the rest of the treatment is the same as that of Example 1.

Embodiment 3

[0036] In this embodiment, the ratio of the amount of substances of β-cyclodextrin glucose unit to epichlorohydrin is 1:2; the ratio of the amount of substances of polyethylene glycol to β-cyclodextrin is 1:4; the rest The processing is the same as in Example 1.

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Abstract

The invention discloses a method for preparing aerogel with beta-cyclodextrin polymers. The method includes sequentially adding secondarily re-crystallized beta-cyclodextrin, polyethylene glycol and epichlorohydrin into sodium hydroxide solution and carrying out stirring reaction until hydrogel is formed; carrying out cold storage and soaking treatment on the hydrogel; carrying out freezing and freeze-drying treatment on the hydrogel to obtain the aerogel. The method has the advantages that processes are flexible, simple and convenient and are low in cost and short in gelation time; the polyethylene glycol is used as a soft-segment polymer, accordingly, the properties of the aerogel with the beta-cyclodextrin polymers further can be regulated and controlled, the apparent density of the aerogel prepared by the aid of the method can be regulated and controlled in the range of 0.1-0.7 g/cm<3>, and the aerogel is of a stable gel skeleton structure; the aerogel is high in porosity and has large specific surface areas and basic three-dimensional network structures, the catalytic, recognition, inclusion and sustained-release capacity of cyclodextrin can be kept, and the aerogel has specific adsorption capacity for aromatic organic matters such as toluene and aniline.

Description

[0001] Technical field: [0002] The invention relates to gel material technology, in particular to a method for preparing aerogel based on beta-cyclodextrin polymer. [0003] Background technique: [0004] Airgel is currently the lightest condensed material among synthetic materials. The hydrogel undergoes a specific drying process to remove the solvent of the network structure and keep the network skeleton structure from collapsing. In addition to the extremely low apparent density, airgel also has the characteristics of high porosity, high specific surface area, and extremely low thermal conductivity. Due to these special structures and excellent characteristics, it has broad application prospects in many fields , such as thermal insulation materials, sound insulation materials, optical devices, supercapacitors, etc. In addition, aerogels also have applications in aerospace, adsorbents, catalysis, and life sciences. [0005] β-cyclodextrin is a truncated cone-shaped cyclic ...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08G81/00C08B37/16
CPCC08B37/0012C08G81/00C08J9/28C08J2305/16C08J2387/00
Inventor 刘泽华徐力武伟高嘉雯周文琴贾盼
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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