Heidrun Schütz

Preparation and Properties of Novel Cationically Active Oligo-p-Methoxystyryl-Silica Composites

Abstract The preparation of cationically active oligo-p-methoxystyrene-silica composites by cationic interfacial polymerization is described. In addition to the effective preparation of the interfacial initiator, p-methoxybenzylium-hydrogen sulfate-silica, and p-methoxybenzylium-trifluoroacetate-silica, a procedure to yield new kinds of composites is reported. The outstanding properties of the “living” oligo-p-methoxy-styryl-hydrogen sulfate-silica is demonstrated by means of zeta potential measurements, solid-state 13C-NMR spectroscopy, UV/Vis spectroscopy, and electron scanning microscopy.

Reaction Composites from Polyfunctional Macromolecules and Inorganic Solids

Abstract For special applications of composite materials, particularly for biomedical uses, the interface between polymer and solid should have a less ordered molecular architecture in order to confer the mobility needed for reactions of ions and low molecular weight agents. Therefore, composites were obtained by controlled reaction of macromolecules, mainly polyepoxides derived from polybutadiene, with glass ceramics which are biocompatible and bioactive. Direct linking of the reacting components by covalent bonds has been demonstrated by IR and NMR spectroscopy using model reactions with silica and other oxides.

Polymeric Nitrofuran Derivatives. II. Chemical Modification of Functionalized Resins with Nitrofuran Derivatives

Abstract Polymeric nitrofuran derivatives have been synthesized by chemical modification of macroporous styrene-divinylbenzene copolymers with low molecular weight nitrofurans. The 5-nitrofuryl groups are covalently attached to the polymeric carrier by azomethine, ester, N-alkyl, and sulfamide links, respectively. Comparative hydrolysis studies and biological tests of the modified resins suggested that the polymeric carrier-bound nitrofurans are antimicrobially active. The polymeric nitrofurans have been characterized by IR and “C-solid-NMR spectroscopy”.