Thermal stability of new sorption materials based on polysiloxanes |
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| Authors: | L K Neudachina A Ya Golub E M Gorbunova Yu G Yatluk |
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| Affiliation: | 1.Division of Analytical Chemistry,Gorki Ural State University,Yekaterinburg,Russia;2.Postovsky Institute of Organic Synthesis, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia |
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| 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 800°C. 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-modified sorbent) oxides are formed predominantly. The quantitative removal of
functional groups during heating up to 800°C 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. |
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