In this study, a novel approach of silica-PVA hybrid aerogel synthesis is presented based on the simultaneous sol-gel reaction of the silica precursor tertramethoxysilane (TMOS) and thermally impacted non-solvent induced phase separation of polyvinyl alcohol (PVA). The method based on: (1) water from PVA solution is required for hydrolysis of TMOS; (2) methanol from TMOS solution, is a non-solvent for PVA. In the result of sol-gel reaction, phase separation and drying during extraction with supercritical CO₂, the hybrid SiO₂-PVA aerogels were obtained. Results indicated that, incorporation of the silica network into the PVA network caused an increase of the specific surface area up to 618 m²/g from 38.3–110 m²/g for pure PVA. The Young's modulus was associated with the bulk density. The obtained hybrid SiO₂-PVA aerogels are a result of two phenomena – the chemical reaction of silica precursor (sol-gel process) and the physical transformation in PVA solution (phase separation).

在这项研究中，基于二氧化硅前体四甲氧基硅烷（TMOS）的同时溶胶-凝胶反应和热影响的非溶剂诱导的聚乙烯醇（PVA）的相分离，提出了一种二氧化硅-PVA混合气凝胶合成的新方法。该方法基于：（1）TMOS的水解需要PVA溶液中的水；（2）来自TMOS溶液的甲醇，是PVA的非溶剂。通过溶胶-凝胶反应，相分离和超临界CO ₂萃取过程中的干燥，得到了SiO ₂ -PVA杂化气凝胶。结果表明，将二氧化硅网络并入PVA网络会导致比表面积从38.3–110 m ²增加到618 m ² / g/ g表示纯PVA。杨氏模量与堆积密度有关。获得的SiO ₂ -PVA杂化气凝胶是两种现象的结果-二氧化硅前体的化学反应（溶胶-凝胶法）和PVA溶液中的物理转变（相分离）。