Producción de látex híbridos acrílicos/alquídicos

In this work, the production of high solids content hybrid acrylic/alkyd latexes by miniemulsion polymerization is discussed. First, the miniemulsification procedure to achieve colloidally stable hybrid nanodroplets is presented. Next, the efficient nucleation of most nanodroplets during the polymerization, avoiding other nucleation mechanisms is presented. Finally, the key aspects to control the polymer architecture as well as the particle morphology are analyzed.Fil: Goikoetxea, Monika. Universidad del País Vasco; EspañaFil: Minari, Roque Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Beristain, Itxaso. Universidad del País Vasco; EspañaFil: Paulis, María. Universidad del País Vasco; EspañaFil: Asua, José M.. Universidad del País Vasco; EspañaFil: Barandiaran, María J.. Universidad del País Vasco; Españ

Continuous miniemulsification for the industrialization of miniemulsion polymerization

Miniemulsion polymerization allows the synthesis of a broad range of materials, which are not obtainable by means of other polymerization processes in dispersed media such as conventional emulsion polymerization. However, the industrial implementation of the miniemulsion polymerization is being hindered by the miniemulsification process, which may require long times leading to unacceptable process times. This work explores the feasibility of using a continuous miniemulsification system that includes a static mixer and a high pressure homogenizer in series, in both loop arrangement and single pass. The proposed system allows the production at high rates, of high solids content miniemulsions containing a very viscous organic phase.Fil: Goikoetxea, Monika. Universidad del Pais Vasco; EspañaFil: Beristain, Itxaso. Universidad del Pais Vasco; EspañaFil: Minari, Roque Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química (i); Argentina. Universidad del Pais Vasco; EspañaFil: Paulis, María. Universidad del Pais Vasco; EspañaFil: Barandiaran, María. Universidad del Pais Vasco; EspañaFil: Asua, José. Universidad del Pais Vasco; Españ

A New Strategy to Improve Alkyd/Acrylic Compatibilization in Waterborne Hybrid Dispersions

Grafting of alkyd resin to the acrylic polymer is needed to fully exploit the possibilities of these hybrids; but in the current technology, grafting is accompanied by an important reduction of the unsaturated groups of the alkyds, which adversely affects the curing of the film and its properties. A novel strategy that overcomes these limitations is presented. The strategy is based on the use of alkyd resin functionalized with methacrylic groups, that substantially improved the incorporation of the resin to the growing acrylic polymer chain, and the polymer particle homogeneity, without decreasing the degree of unsaturation in the alkyd resin.Fil: Goikoetxea, Monika. Universidad del Pais Vasco; EspañaFil: Minari, Roque Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química (i); Argentina. Universidad del Pais Vasco; EspañaFil: Beristain, Itxaso. Universidad del Pais Vasco; EspañaFil: Paulis, María. Universidad del Pais Vasco; EspañaFil: Barandiaran, María. Universidad del Pais Vasco; EspañaFil: Asua, José M.. Universidad del Pais Vasco; Españ

Post-polymerization of waterborne alkyd/acrylics. Effect on polymer architecture and particle morphology

The limiting conversion commonly attained in the synthesis of waterborne alkyd/acrylic hybrid latexes hinders their industrialization. In the first part of this work, the mechanisms causing the limiting conversion are studied and post-polymerization conditions to efficiently remove the residual monomer determined. Both the polymer architecture and the particle morphology were modified. Therefore, in the second part the mechanisms involved in this modification were investigated in an attempt to transform a potential threat for the material properties in an opportunity to expand the range of properties achievable.Fil: Minari, Roque Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química. Universidad Nacional del Litoral. Instituto de Desarrollo Tecnológico para la Industria Química; ArgentinaFil: Goikoetxea, Monika. Universidad del País Vasco; EspañaFil: Beristain, Itxaso. Universidad del País Vasco; EspañaFil: Paulis, María. Universidad del País Vasco; EspañaFil: Barandiaran, María J.. Universidad del País Vasco; EspañaFil: Asua, José M.. Universidad del País Vasco; Españ

Transformation of waterborne hybrid polymer particles into films: Morphology development and modelling

Films cast from multiphase polymer particles have the potential to combine the properties of their components synergistically. The properties of the film depend on the hybrid polymer architecture and the film morphology. However, how the polymer microstructure and particle morphology are transformed during film formation to determine the film morphology is not well understood. Here, using waterborne alkyd-acrylic nanocomposite particles in a case study, it was found that phase migration leading to the formation of aggregates occurred during film formation. A coarse-grained Monte Carlo model was developed to account for the effects of polymer microstructure and particle morphology on the morphology of the film. The model was validated by comparing its predictions with the observed effects, and then used to explore combinations of polymer microstructure and particle morphology not attainable with the system used as a case study. Significantly, the compatibility of the phases was found to have a greater influence than the morphology of the particles in determining the film structure.Fil: Goikoetxea, Monika. Universidad del Pais Vasco; EspañaFil: Reyes, Yuri. Universidad del Pais Vasco; EspañaFil: de Las Heras Alarcón, Carolina. University of Surrey; Reino UnidoFil: Minari, Roque Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Desarrollo Tecnológico para la Industria Química (i); Argentina. Universidad del Pais Vasco; EspañaFil: Beristain, Itxaso. Universidad del Pais Vasco; EspañaFil: Paulis, María. Universidad del Pais Vasco; EspañaFil: Barandiaran, María. Universidad del Pais Vasco; EspañaFil: Keddie, Joseph L.. University of Surrey; Reino UnidoFil: Asua, José M.. Universidad del Pais Vasco; Españ