Thermal Stability of New Sorption Materials Based on
Polysiloxanes

L. K. Neudachina^a,*, A. Ya. Golub^a, E. M. Gorbunova^a, and Yu. G. Yatluk^b,**

^aDivision of Analytical Chemistry, Gorki Ural State University, pr. Lenina 51, Yekaterinburg, 620083 Russia

*e-mail: Ludmila.Neudachina@usu.ru

^bPostovsky Institute of Organic Synthesis, Ural Branch, Russian Academy of Sciences,
ul. Akademicheskaya 22, Yekaterinburg, 620990 Russia

**e-mail: yatluk@ios.uran.ru

Received December 10, 2010

Abstract—The thermal stability of the unmodified, aminated, and thiocarbamoylated polysiloxanes has been
studied. The siloxane matrix is stable in the temperature range up to 800C. For the first time, mass spectrometry
has been applied to the analysis of the composition of the gaseous products of thermal decomposition of the
studied polysiloxanes. It has been shown that, in the process of thermal decomposition, the terminal functional
groups are detached and oxidized. Water, ammonia, nitrogen, carbon, and sulfur (in the case of thiourea-mod-
ified sorbent) oxides are formed predominantly. The quantitative removal of functional groups during heating
up to 800C has been confirmed by IR spectroscopy. A mechanism of thermal decomposition of polysiloxane
xerogels has been proposed. It has been found that adsorption of platinum increases the thermal stability of the
samples.

Keywords: polysiloxane, sol–gel synthesis, thermal destruction, thermogravimetry

DOI: 10.1134/S1087659611060137

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