Double-network phase change aerogel and preparation method thereof

Abstract

The invention discloses a double-network phase change aerogel and a preparation method thereof. The double-network phase change aerogel is prepared through emulsion polymerization. The prepared phase-change aerogel not only reserves rich pore structures of aerogel, but also realizes dual functions of a phase change material and an aerogel material, so a basis is provided for more functionalizationpurposes. The phase change aerogel can effectively realize the immobilization of PEG; a phase change temperature can be regulated and controlled by the molecular weight of PEG; phase change enthalpyreaches 90 J / g or above; a specific surface area reaches 230 m<2> / g or above; an aperture ratio reaches 90% or above; a heat-resistant temperature reaches 350 DEG C or above. The phase change aerogelcan be applied to the fields of intelligent textiles, heat preservation and insulation materials, protective materials, intelligent adsorbents, industrial waste heat utilization and the like. Based onthe regulation and control mechanism of the chemical structure and the morphological structure of the phase change aerogel, different dual-network immobilization components can be selected to realizemore functions in optical and electrical aspects and other aspects.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a double-network phase-change airgel and a preparation method thereof. Background technique [0002] Phase change aerogels are usually prepared with phase change materials as the core, which are fixed in the pore structure of the existing airgel, and the phase change materials are fixed in the airgel to undergo a phase change. For PEG-like solid-liquid phase change materials, the airgel restricts the flow of the phase change material so as to avoid the leakage of the phase change material and increase the storage stability and long-term performance of the phase change material. [0003] In recent years, there have been patents for preparing composite phase change materials using airgel as a matrix. Patent No. CN107617396A uses airgel microspheres as a template, and immerses airgel microspheres in molten state phase change materials. , cooling and solidification to obtain pha...

AI Technical Summary

Problems solved by technology

At present, the vacuum impregnation method is generally used for phase change aerogels. The phase change material is fixed in the pores of the airgel by capillary action through the vacuum degree formed by the vacuum drying oven. It is made by physical adsorption in steps, and the distribution of the phase change material is insufficient. Disadvantages such as uniformity, limited adsorption capacity, and closed pores

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