Concentration effects in pseudomatrix synthesis and phase separation of cationic

2019-08-14 08:53:17

separation concentration nanoparticles Ser sols

责任者: Litmanovich, O.E.;Marmuzov, G.V.;Litmanovich, A.A.;Papisov, I.M. 单位: MADI, Moscow, 125319, Russian Federation 来源出处: Vysokomolekularnye Soedineniya. Ser.A Ser.B Ser.C - Kratkie Soobshcheniya,2004,46(8):1374-1382 摘要: Effects of the concentration of a cationic polyelectrolyte, poly(1,2-dimethyl-5-vinylpyridinium methyl sulfate), on the mean size of copper nanoparticles arising from the reduction of copper ions in an aqueous solution, the composition of macromolecule-particle complexes, and the phase separation behavior of sols of polymer-metal nanocomposites are studied. A reduction in the polymer concentration in the reaction medium leads to a less uniform distribution of metal nanoparticles among polycations. At the initial stage of phase separation of these sols, metal nanoparticles are redistributed almost uniformly among macromolecules. However, a decrease in the concentration of free macromolecules in the dispersion medium to a certain level brings about disproportionation of nanoparticle distribution among polycations and formation of flocci. 关键词: Polyelectrolytes;Sols;Plastics fillers;Phase separation;Nanostructured materials;Copper;Polymer sols;Polycations;Filled polymers