Thermal Desorption Mass Spectrometry

Category: Ukrainean-polish sympozium

THERMAL DESORPTION MASS SPECTROMETRY

OF POLYMERS ADSORBED ON PYROGENIC SILICA

V. M. Bogatyr’ov, V. A. Pokrovskiy

Institute for surface chemistry, National Academy of Sciences  of Ukraine Prospekt Nauki 31, 252022 Kyiv, Ukraine

Specific features of thermal decomposition of polydimethylsiloxane (PDMS) and polyvinylpyrrolidone (PVP) adsorbed on the surface of ultrafine pyrogenic silica were investigated in the present study by means of temperature-programmed desorption mass spectrometry.

PDMS and PVP containing silica samples were synthesized with concentrations of adsorbed polymer from 2 to 10 mcmole/m2. Mixed oxides containing admixtures of P, Ti, Al, Cr and Zn oxides were also used to clarify effect of solid matrix active sites on thermal decomposition of polymer.

Different to initial PVP for which three main stages of decomposition were observed silica containing PVP demonstrated only two stages with maxima at 120 and 360 °Ñ. Evolution of pyrrolydone molecule at low temperature correlate with amount of adsorbed polymer. At the stage of intense decomposition of main chain of PVP with maximum in the region of 360 °Ñ the parallel evolution was observed of pyrrolydone (85 m/z) and vynilpyrrolidone (111 m/z). Contribution of peak intensities of those two compounds changed linearly in the row of polymer concentrations.

For the silica-PDMS containing samples preferential formation and evolution of hexamethylcyclotrisiloxane (207 m/z) as a main product of thermal decomposition was observed, with wide maximum in the interval of 400-500°Ñ. Shape of this maximum depends upon oxide structure and composition Thus, interaction of macromolecules with surface sites of solid matrix demonstrated essential influence on the process of thermal decomposition of adsorbed polymers.

Authors acknowledge Science and Technology Center in Ukraine for financial support (Grant 1068).



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