化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (9) : 250-252.

开发与应用

SiO₂/纤维素复合气凝胶的制备及性能研究

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作者信息 +

Preparation of SiO₂/cellulose composite aerogel and exploration of their property

Shan Youna^1,2, Jing Zhijiao¹, Ge Xuesong¹, Wu Lin³, Jiang Yijun¹

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文章历史 +

Received
2017-05-11
Issue Date	Revised Date
2018-11-05	2017-05-11

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摘要

采用纤维素为原料,氢氧化锂(LiOH)/尿素/水(H₂O)体系为溶剂,硅酸钠(Na₂SiO₃)为硅源,在纤维素凝胶骨架中原位合成纳米二氧化硅(SiO₂),制得SiO₂/纤维素复合气凝胶,并考察了SiO₂对其结构和性能的影响。结果表明,SiO₂/纤维素复合气凝胶不仅保持了纯纤维素气凝胶的骨架结构,同时SiO₂显著增加了气凝胶的比表面积,改善了力学性能,在SiO₂用量为47.27%(wt,质量分数)条件下,SiO₂/纤维素复合气凝胶的比表面积高达528m²/g,压缩模量为6.18MPa。

Abstract

SiO₂/cellulose composite aerogels were prepared by in-situ formation of nano-silica (SiO₂) in cellulose gel matrix using cellulose as the raw material,LiOH/urea/H₂O system as the solvent and Na₂SiO₃ as the precursor.The effect of SiO₂ on the structure and properties of aerogels were studied.The results showed that composite aerogels not only kept the porous structure of pure cellulose aerogel,but also increased the specific surface area of aerogels and improved their mechanical property.When the dose of SiO₂ in composite aerogels was up to 47.27wt%,the specific surface area was up to 528m²/g and the compressive strength was 6.18MPa.

关键词

纤维素 / 纳米SiO₂ / 复合气凝胶 / 比表面积 / 力学性能

Key words

cellulose / nano-SiO₂ / composite aerogel / specific surface area / mechanical property

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SiO₂/纤维素复合气凝胶的制备及性能研究[J]. 化工新型材料, 2018, 46(9): 250-252 DOI:

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