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Description:

シリコーンは疎水性が高いため、ゾル－ゲル法でモノリス型マクロ多孔体を作製する際には、これまで界面活性剤を使用する必要があった。不純物である界面活性剤は乾燥前に完全除去する必要があり、洗浄には大量の溶媒と時間を要する問題が存在した。本研究では、原料として用いるケイ素アルコキシドの組成を工夫することで、界面活性剤を使用しない作製法に成功した。得られたモノリスは、80%の単軸圧縮や大幅な曲げ後にも元の形状を回復し、高い撥水性を示した。室温における熱伝導率は約0.035 W m−1 K−1であり、60%まで圧縮してもこの熱伝導率は変わらなかった。狭い空間における断熱応用が期待される。

Description:

Due to the highly hydrophobic nature of silicone, it has been necessary to use a surfactant in the preparation of monolithic macroporous materials using the sol-gel method. The unwanted surfactant must be completely removed before drying, and washing requires a large amount of solvent and time. In this study, a surfactant-free preparation method was developed by modifying the composition of the silicon alkoxide used as raw material. The obtained monoliths recovered their original shape even after 80% uniaxial compression and significant bending, and exhibited high water repellency. The thermal conductivity at room temperature was about 0.035 W m-1 K-1, which did not change even after 60% compression. It is expected to be used for thermal insulation in confined spaces.

Rights:

• In Copyright
  This is a pre-copyedited, author-produced version of an article accepted for publication in Bulletin of the Chemical Society of Japan following peer review. The version of record Gen Hayase, Surfactant-Free Aqueous Fabrication of Macroporous Silicone Monoliths for Flexible Thermal Insulation, Bulletin of the Chemical Society of Japan, Volume 94, Issue 9, September 2021, Pages 2210–2215 is available online at: https://doi.org/10.1246/bcsj.20210189

Keyword: porous monoliths, silicone, thermal insulation

Date published: 2021-09-15

Publisher: The Chemical Society of Japan

Journal:

• Bulletin of the Chemical Society of Japan (ISSN: 13480634) vol. 94 issue. 9 p. 2210-2215

Funding:

• Ministry of Education, Culture, Sports, Science and Technology

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4664

First published URL: https://doi.org/10.1246/bcsj.20210189

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Updated at: 2024-08-20 16:30:26 +0900

Published on MDR: 2024-08-20 16:30:26 +0900