Thermal, Mechanical, and Acoustic Properties of Polydimethylsiloxane Filled with Hollow Glass Microspheres

Materials

Leonid M. Dorogin¹  Ilya M. Sosnin¹  Rünno Lõhmus²  Sergei Vlassov²  Martin Timusk²  Artis Linarts³  Veronika Zadin⁴  Tauno Tiirats⁴  Andreas Kyritsakis⁴  Sven Oras⁵ 

[1] Institute of Advanced Systems for Data Transmission, ITMO University, Kronverskiy pr., 49, 197101 Saint-Petersburg, Russia;Institute of Physics, University of Tartu, W. Ostwaldi Str. 1, 50412 Tartu, Estonia;Institute of Technical Physics, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3/7, 1048 Riga, Latvia;Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia;Tartu College, Tallinn University of Technology, Puiestee 78, 51008 Tartu, Estonia;

关键词: PDMS;    hollow glass microspheres;    thermal conductivity;    sound insulation;   

DOI  :  10.3390/ma15051652

来源: DOAJ

【 摘 要 】

Polydimethylsiloxane (PDMS) is the most widely used silicon-based polymer due to its versatility and its various attractive properties. The fabrication of PDMS involves liquid phase cross-linking to obtain hydrophobic and mechanically flexible material in the final solid form. This allows to add various fillers to affect the properties of the resulting material. PDMS has a relatively low Thermal Conductivity (TC), in the order of 0.2 W/mK, which makes it attractive for thermal insulation applications such as sealing in construction. Although a further decrease in the TC of PDMS can be highly beneficial for such applications, most research on the thermal properties of PDMS composites have focused on fillers that increase the TC rather than decrease it. In the present work, we propose a simple and reliable method for making a PDMS-based composite material with significantly improved thermal insulation properties, by adding hollow glass microspheres (HGMs) to the mixture of the liquid base and the cross-linker (10:1 ratio), followed by degassing and heat-assisted crosslinking. We obtained a 31% reduction of thermal conductivity and a 60% increase in the elastic modulus of samples with HGM content of 17% by weight. At the same time, the sound insulation capacity of the PDMS-HGM composite is slightly decreased in comparison to pure PDMS, as a result of its lower density. Finally, the wettability of the samples had no dependence on HGM content.

【 授权许可】

Unknown