Chemisorption and thermal decomposition of polyvinylpyrrolidone adsorbed by pyrogenic silica as model of surface reactions on atmospheric microparticles

  • V. A. Pokrovskiy Інститут хімії поверхні НАН України
  • V. M. Bogatyrov Інститут хімії поверхні НАН України

Анотація

Thermal decomposition of polyvinylpyrrolidone (PVP) in bulk and adsorbed on ultra-fine silica surface was studied as a model of thermal transformation of anthropogenic environmental pollutants on the surface of atmospheric micro-particles,

Three stages of polymer decomposition with maxima at 150, 280 and 360°C were observed for bulk samples of PVP of average molecular mass about 10 000. Pyrrolidone (m/z 85) was the main product resulting from elimination of side groups in main polymer chain. Rupture of main chain itself resulting in elimination of vinylpyrrolidone (m/z 111) was the main process at high temperature and occurred in single stage with maximum at 360°C.

Thermal decomposition of PVP thin layers on the surface of ultra-fine pyrogenic silica was also studied. Samples were obtained by adsorption of PVP on Aerosil A-300 surface and contained 5.8, 16.9 and 29.3 mass % of polymer. Unlike to silica-free samples, only two maxima of 85 m/z elimination (at 120 and 360 °C) were observed, majority of pyrrolidone being produced during the high-temperature stage. Details of polymer decomposition depended essentially upon portion of adsorbed PVP. The conclusion was done that adsorption slows down the conformation exchange and effects the process of polymer decomposition.

Посилання

An Association between air pollution and mortality in six US cities / D W Dockery, C.A. Pope, X. Up et al. // N. Eng. J. Med. - 1995,- V. 329 - P. 1753-1759.

Pokrovskiy V.A. Temperature-programmed desorption mass spectrometry (TPD MS) of dispersed oxides// Adsorption Science & Technology - 1997,- V. 14, N 5 - P. 301 - 317.

Temperature-programmed desorption mass spectrometry of chemically modified disperse oxides as models of industrial aerosols / V.A. Pokrovskiy, R. Zenobi, V.M. Bogatyr’ov, V.M. Gunko // Environ. Sci. & Pollut. Res. - 1998. - V. 5, N 3. - P. 192

The ozone-depleting volatile organic compounds in Antarctic ice / V.I. Bogillo, V.A. Pokrovskiy, О. V. Kuraev, P.F. Gozhyk // Environ. Sci. & Pollut. Res. - 1998,- V. 5, N3.-P. 136.

Temperature-programmed desorption mass spectrometry of carbonized silica surface / V.A. Pokrovskiy, R. Leboda, V.V. Turov, D. Charmas, J. Ryczkowski // Carbon. - 1998. -N 17. - P. 1039-1047.

Pokrovskiy V.A., Bogillo V.I., Dabrowski A.. Adsorption and Chemisorption of Organic Pollutants on the Solid Aerosols Surface //Adsorption and its Application in Industry and Environmental Protection. - V. 2. (Studies in Surface Science and Catalysis. - V. 120B). - A, Dabrowski, Ed. - Amsterdam: Elsevier, 1998. - P. 571-634.

Pokrovskiy V.A. Temperature-programmed desorption mass spectrometry // Proceedings of the 28th International Vacuum Microbalance Techniques Conference. -Kiev, 1999. - P. 22-24.

Gunko V.V., Leboda R., Pokrovskiy V.A. Pathways for decomposition of phenylethanol bound to silica surface // Polish J Chem. - 1999. - V. 73. - P. 1345-1356.

TPD MS Investigation of Carbonized Silica Synthesized from Phenylethanole / V.A. Pokrovskiy, R. Leboda, B. Charmas, C.J. Ryczkowski // In: material Oil Pollution International Conference ( Poland, August 29 - September 3, 1999). - P. 84 - 89.

Influence of Carbonization and Porosity on the Characteristics of the Interphasial Layers of the Water in Aqueous Suspensions of Dispersed Particles / R. Leboda, V.A. Pokrovskiy // Material Oil Pollution International Conference. (Poland, August 29 - September 3, 1999). - P. 71-75.

Pokrovskiy V.A Temperature-programmed desorption mass spectrometry // Journal of Thermal Analysis and Calorimetry. - 2000, - V. 62,- P. 407-415.

Опубліковано
2001-06-10
Як цитувати
Pokrovskiy, V. A., & Bogatyrov, V. M. (2001). Chemisorption and thermal decomposition of polyvinylpyrrolidone adsorbed by pyrogenic silica as model of surface reactions on atmospheric microparticles. Поверхня, (4-6), 348-356. вилучено із http://surfacezbir.com.ua/index.php/surface/article/view/72