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Polymerization of Vinyl Monomers on the High Disperse Aluminum-Containing Silica

Levytska S., Grebenyuk A., Brei V.

Polish Journal of Chemistry

2003

Vol. 77 / nr 5

547-556

The interaction of vinyl monomers (styrene, butyl vinyl ether, N-vinylpyrrolidinone, vinyltrimethylsilane, methyl acrylate, vinyl acetate, and vinylacetonitrile) vapours with aluminoaerosil surface has been studied by IR spectroscopy, thermal gravimetry, field ionization mass-spectrometry, and by quantum chemical simulations. The Bronsted acidic sites of the oxide (Í0 _ -3.0) were found to be capable to initiate an oligomerization of butyl-vinyl ether, styrene and N-vinylpyrrolidinone, whereas the monomers containing electron acceptor substituents (methyl acrylate, vinyl acetate, and vinylacetonitrile) are sorbed only in a physical way. The method of vapour phase oligomerization at temperatures 30-120_C has been shown to be a suitable way to produce disperse composite materials with a great content of organic matter (40-60 wt. %). Experimental and calculated absorption spectra support the idea on the formation of both monomeric and oligomeric protonated species due to adsorption of vinyl monomers on the surface of aluminum-containing silica unlike on that of pure silica.