Preparation method of aerogel based on double network structure design

Abstract

The invention discloses a preparation method of an aerogel based on a double network structure design. The method comprises the steps that a sodium alginate is added by a one-step or two-step method by radical polymerization to form a gel solution of a polyacrylamide chemical cross-linking network interpenetrating sodium alginate structure, gel is extruded into a coagulation bath to form microspheres or fiber and other forms, at the same time, calcium alginate ion cross-linking is formed through ion exchange, and finally a double-network structure hydrogel interlocking chemical cross-linking and ion cross-linking is formed. After washing with water and freeze-drying, finally an aerogel is obtained. The aerogel exhibits a microscopic multi-layered pore structure with large pore nested mesopores and micropores. According to the preparation method of the aerogel based on the double network structure design, the sodium alginate and acrylamide are utilized to prepare the composite aerogel,the application of an aerogel material in actual production is expanded, and moreover theerogel material has outstanding characteristics of economy, environmental protection, biocompatibility, degradation and the like compared with other aerogel materials, not only can be processed into microspheres, massive structure, but also can directly be processed into fiber morphology.

Description

technical field

[0001] The invention belongs to the field of materials, in particular to a preparation method and application of sodium alginate and acrylamide composite airgel. Background technique

[0002] Aerogels are nanoporous materials. Because of its low thermal conductivity, low density, high porosity, and large specific surface area, it is widely used in adsorbents, insulating materials, and other fields. Polymer-based aerogels can be designed into multilayer structures and have advantages over other aerogels, such as silica aerogels, carbon nanotube aerogels, resorcinol-formaldehyde aerogels, and algae, etc. Biopolymer aerogels are widely available, reproducible, low-cost, and non-toxic; therefore, they are receiving increasing attention.

[0003] Polymer aerogels are prepared by using chemical or physical cross-linked networks, which can be regulated by multi-level structures to produce a wider range of properties; biomass aerogels are more versatile because of ...

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