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One-pot synthesis of polymer-reinforced silica aerogels from high internal phase emulsion templates.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.jcis.2020.03.118
Qin Wang 1 , Heng Yu 1 , Zeyu Zhang 1 , Yongliang Zhao 2 , Haitao Wang 1
Affiliation  

HYPOTHESIS Conventional strategies for strengthening silica aerogels through polymer modification always lead to a significant density increase and an obvious sacrifice of thermal insulation performance. In this work, we propose a facile one-pot method for the preparation of polymer-reinforced silica aerogels via polymerization of water-in-oil high internal phase emulsion (HIPE) templates. EXPERIMENTS Hyperbranched vinyl-modified polyethoxysiloxane (VPEOS) is used as both emulsion stabilizer and silica source. FT-IR spectra of VPEOS are recorded to confirm the successful incorporation of vinyl groups. The pore structure of polymer-functionalized silica aerogels is characterized by a scanning electron microscope (SEM), nitrogen adsorption-desorption and mercury intrusion porosimetry. FINDINGS The Young's modulus is increased from 0.69 to 19.28 MPa, nearly 28 times that of unmodified silica aerogels. Moreover, the silica aerogels present a superhydrophobicity with a water contact angle of 152.4° and good thermal insulation. The superior performance properties of the polymer-reinforced silica aerogels over pure silica aerogels may guarantee their wide applications in energy and aerospace fields.

中文翻译:

从高内相乳液模板一锅法合成聚合物增强的二氧化硅气凝胶。

假设通过聚合物改性来增强二氧化硅气凝胶的常规策略始终会导致密度显着增加,并显着降低隔热性能。在这项工作中,我们提出了一种通过油包水高内相乳液(HIPE)模板聚合制备聚合物增强的二氧化硅气凝胶的简便的一锅法。实验超支化乙烯基改性聚乙氧基硅氧烷(VPEOS)既用作乳液稳定剂,又用作二氧化硅源。记录VPEOS的FT-IR光谱以确认乙烯基的成功结合。聚合物功能化二氧化硅气凝胶的孔结构通过扫描电子显微镜(SEM),氮吸附-解吸和压汞法进行表征。结果杨氏模量从0.69增加到19。28 MPa,几乎是未改性二氧化硅气凝胶的28倍。此外,二氧化硅气凝胶具有超疏水性,水接触角为152.4°,并且具有良好的隔热性。聚合物增强的二氧化硅气凝胶优于纯二氧化硅气凝胶的优异性能可以保证其在能源和航空航天领域的广泛应用。
更新日期:2020-03-31
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