A free impinging-jets microreactor was used for synthesizing rhabdophane-structured LaPO 4 sols. The rheological behavior was investigated for the sols obtained both by reagents mixing in a microreactor, and by pouring the initial solutions together and mixing them on a magnetic stirrer. Lanthanum phosphate sols obtained by two ways are structured systems characterized by deformation behavior accompanied by shear liquefaction. Some discovered anomalies were found to be associated with flow nonequilibrium at low shear rates, which indirectly indicates stronger binding of particles in the structure of samples obtained by the microreactor synthesis.
The surface properties of aqueous solutions of carboxylcontaining polymers were studied using homo-and copolymers of acrylic and N-vinylaminosuccinic acids with other vinyl monomers as an example. The influence of molecular weight, degree of ionization of carboxyl groups and monomer composition on the surface activity of the (co)polymers is considered. The possibility of inverting known regularities while ignoring the peculiarities of the conformational state of the polymer macromolecules in solution and in the adsorption layer, ignoring the tendency of the polymer to conformational rearrangements and ignoring the rate of this process is discussed.
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