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Fabrication and Characterization of MSQ Aerogel Coating on ePTFE Thin Films for Cable Sheaths

School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Pan Asia Microvent Tech (Jiangsu) Corporation & Zhejiang University Micro-nano-porous Materials United Research Development Center, Changzhou 213100, China
Author to whom correspondence should be addressed.
Academic Editors: Eng. Carlos A. García-González and Luísa Durães
Molecules 2019, 24(7), 1246;
Received: 28 February 2019 / Revised: 26 March 2019 / Accepted: 27 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Engineering of Aerogels and Their Applications)
PDF [15273 KB, uploaded 30 March 2019]


With methylsilsesquioxane (MSQ) aerogels synthesized by the sol-gel method as a raw material and Si-Ti sol as a binder, an alcohol-based aerogel slurry consisting of only MSQ aerogel and Si-Ti sol was prepared and coated on expanded polytetrafluoroethylene (ePTFE) to form an MSQ aerogel coating layer, followed by low-temperature heat treatment. The effect of Si-Ti sol content on the microstructure of the MSQ aerogel coating layer was investigated, and the properties of a typical MSQ aerogel-layer-coated ePTFE film were evaluated. The results show that Si-Ti sol has an important role in terms of film-forming capability, surface smoothness, flexibility, and powder dropping of the MSQ aerogel coating layer. With a Si-Ti sol of 10.5 wt.% content as a binder and after heat treatment at 170 °C for 30 min, the coated ePTFE flexible thin film with a layer thickness of 30 μm shows high uniformity, integrity, and electrical insulation properties, with an elongation at break decrease over 130%, a thermal conductivity of 0.1753 W/(m·K) at 25 °C, a dielectric constant of 16.5674, and a dielectric loss of 0.06369, which can be promisingly applied in cable sheaths. View Full-Text
Keywords: MSQ aerogel; ePTFE; aerogel coating; cable sheath MSQ aerogel; ePTFE; aerogel coating; cable sheath

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Guo, X.; Bai, S.; Shan, J.; Lei, W.; Ding, R.; Zhang, Y.; Yang, H. Fabrication and Characterization of MSQ Aerogel Coating on ePTFE Thin Films for Cable Sheaths. Molecules 2019, 24, 1246.

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