Preparation and Characterization of Acetic Acid-Functionalized Fe3O4@SiO2 Nanoparticles as an Efficient Nanocatalyst for the Synthesis of Nitrones in Water

Silicon - Magnetic materials grafted with acetic acid (Fe3O4@SiO2COOH MNPs) were successfully prepared from the incorporation of bromoacetic acid as a functional group on the surface of magnetite...     

电视发射机改造(二)北广10kW电视发射机改造中使用的固态化推动级

本文介绍了北广10kW电视发射机改造中固态化推动级的电路原理及技术指标。     

Polymeric compositions from mixtures of amine-containing polymers

The properties of aqueous acetic-acid solutions of chitosan and copolyacrylmethacrylate Eudragit E, which contains tertiary amines, were studied. It was shown that monophasic solutions in a common solvent in a certain pH range that enabled the degree of protonation of the amines and the conditions for chemical cross-linking of chitosan to be controlled could be prepared by using amine-containing polymers with different types of amines. IR spectroscopy of films formed from solutions of combined chitosan and Eudragit E showed that the functional groups of the studied amine-containing polymers did not interact. The ability to change the degree of swelling and the solubility of the films by adding a bifunctional reagent that reacted only with primary amines was demonstrated.