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Vlassov et al - Thermal conductivity of PDMS filled with hollow glass microspheres PRE-PRINT.pdf (1.02 MB)

Thermal Conductivity of PDMS Filled with Hollow Glass Microspheres

submitted on 07.12.2020, 17:48 and posted on 08.12.2020, 13:18 by Sergei Vlassov, Sven Oras, Martin Timusk, Vahur Zadin, Ilja Sosnin, Rünno Lõhmus, Leonid M. Dorogin
Polydimethylsiloxane (PDMS) is the most widely used silicon-based polymer due to its versatility and the range of attractive properties. Fabrication of PDMS involves liquid phase cross-linking to obtain hydrophobic and mechanically flexible material in the final solid form. This gives opportunity to add various fillers to affect the properties of resulting material. In the present work, we describe simple and reliable method of making a PDMS-based composite material with significantly improved thermal insulation properties by adding hollow glass microspheres (HGMs) to the mixture of liquid base and cross-linker (10:1 ratio) followed by degassing and heat-assisted crosslinking. We obtained 31% reduction of thermal conductivity for samples with HGMs content of 20% by mass. At the same time, sound insulation capacity slightly decreased as a result of lower density of PDMS-HGMs composite in comparison to pure PDMS. The wettability of the samples had no dependence on HGMs content.


Russian Science Foundation project grant 18-19-00645 "Adhesion of polymer-based soft materials: from liquid to solid"

Estonian Centre of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts, ZEBE, grant 2014-2020.4.01.15-0016 funded by the European Regional Development Fund

ERA Chair MATTER from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 856705


Email Address of Submitting Author


Institute of Physics, University of Tartu



ORCID For Submitting Author


Declaration of Conflict of Interest

No conflict of interests