Synthese anionique de polymeres comportant une fonction vinylsilane a l'une ou aux deux extremites de la chaine macromoleculaire

The reaction of vinyldimethylchlorosilane with a living polymer (ω or α,ω carbanionic) leads under certain conditions to the quantitative formation of a vinylsilane group to one or two ends of the macromolecular chain.     

Aggregation of sensitizing dyes in solution and their adsorption onto silver halides

The formation of dye dimers and higher aggregates in solution as a function of dye structure and environmental variables are considered. These factors, together with silver halide composition and crystal habit, are also examined in regard to their influence on surface spectra, dye orientation and forces involved in adsorption of dyes at silver halide substrates.     

Etude de la reaction d'addition de polystyrenes ω-vinylsilane avec une molecule-modele des α,ω-dihydrogeno-polydimethylsiloxanes

Three-block copolymers polystyrene-polydimethylsiloxane-polystyrene can be obtained by a hydrosilylation reaction between α,ω-dihydrogeno polydimethylsiloxane and ω-vinylsilane polystyrene molecules.The purpose of the present investigation was to establish by use of a model system, the optical conditions for the synthesis of three-block and multiblock copolymers: reaction temperature and concentrations of reactants and catalyst.     

Polymerization of Cyclic Imino Ethers. X. Kinetics,Chain Transfer,and Repolymerization

The main conclusions in studies on polymerization catalysts and the nature of chain transfer in the polymerization of cyclic imino ethers were that there is extensive chain transfer in the 2-alkyl oxazolines to produce polymer with a reactive end. Toward the end of polymerization, these chain-transferred molecules repolymerize back on the active center producing a multibranched star polymer. A theory for the data was developed.     

Messung der Kompression von gequollenen Polystyrol-Netzwerken in einer Richtung

Ohne Zusammenfassung     

Prozessüberwachung eines chromatographischen Verfahrens der Kerntechnik

A chromatographic separation can be controlled only by the determination of the separated component concentration in the column effluent. This control is implemented by an in-line scintillation counting procedure during an extraction chromatographic purification of predecontaminated Th-containing fuel solutions from Np and Pu. In addition, the throughput ofthe process feed solution is determined, and the measuring signals of both determinations are used by appropriated control circuits to regulate the process operation and to perceive the process incidents.