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2 Polish Journal of Chemistry

2 2008

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Preparation and Characterization of Porous Polymer Composites Filled with Chemically Modified Silicas

Bolbukh Y. M., Tertykh V. A., Kuzema P. O., Gawdzik B.

Polish Journal of Chemistry

2008

Vol. 82, nr 1-2

17-24

Effect of the silica filler with varied concentration of surface trimethylsilyl and silicon hydride groups on porosity and solvent resistance of divinylbenzene-styrene (DVB-St) and divinylbenzene-di(methacryloyloxymethyl)naphthalene (DVB-DMN) copolymers was studied by adsorption of p-chloroaniline. Filling with silica was shown to increase considerably solvent resistance of DVB-St copolymer, and the filler surface chemistry was found to affect essentially its porosity. Introducing of modified silicas may both increase and decrease solvent resistance of DVB-DMN copolymer, and overall functionalization of filler surface with trimethylsilyl or trimethylsilyl (20%) and silicon hydride (80%) groups have maximum effect on porosity of this copolymer.

Interaction of Pyridoxine with Hydrophilic-Hydrophobic Highly Dispersed Silica

Laguta I., Kuzema P. O.

Polish Journal of Chemistry

2008

Vol. 82, nr 1-2

85-92

Interaction of pyridoxine with hydrophilic-hydrophobic highly dispersed silica surface in aqueous solution has been investigated. It has been found that absorption on partially hydrophobized silica increases reaching the maximum at 12% of surface trimethylsilylation as opposed to the unmodified silica. The increase in adsorption was attributed to stabilization of pyridoxine adsorption complexes on silica surface due to additional hydrophobic and dispersive interactions with grafted trimethylsilyl groups.