Anales CIDEPINT 1996
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Examinando Anales CIDEPINT 1996 por Autor "Amalvy, Javier Ignacio"
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Acceso Abierto Dilute-solution viscosimetry and solution properties of colloidal polymers(1996) Amalvy, Javier IgnacioThe intrinsic viscosities of a terpolymer of methyl methacrylate, ethyl acrylate and methacrylic acid, prepared by semicontinuous emulsión polymerization (látex) were measured in acetone and THF at different temperatures. Data were analyzed with the aid of the equations of Huggins, Kraemer, Martín, Schulz-Blaschke and an equation recently suggested by Rao. Relationships between different parameters were also considered The effects of low-molecular weight and water-soluble compounds on the intrinsic viscosities were observed for uncleaned samples of látex as compared to samples purified, by single precipitation or by dissolution and precipitation from THF. Solvent powers and effects of degree of purification and temperature on viscosity are discussed. Polymer-solvents interactions are discussed in terms of the acceptor / donor properties of the solvents. - Artículo
Acceso Abierto Recent developments in miniemulsion polymerization(1996) Aizpurua, I.; Amalvy, Javier Ignacio; Baralidiaran, M. J.; de la Cal, J. C.; Asua, J. M.Some developments in miniemulsion polymerization aiming at taking advantage of its unique mechanisms minimizing the drawbacks of this technique are discussed. The discussion ineludes preparation of highly concentrated latexes, miniemulsion polymerization in continuous stirred tank reactors (CSTRs), and elimination of the low molecular weight hydrophobe.