Synthesis of polymer particles and nanocapsules stabilized with PEO/PPO containing polymerizable surfactants in miniemulsion
ABSTRACT We describe the miniemulsion polymerization of vinyl monomers stabilized in the presence of the polymerizable anionic surfactant Tego XP-1008 and the polymerizable nonionic surfactant Tego XP-1007. Different amounts of polymerizable surfactants and various types of initiators were used to investigate the size and the stability of the final latex particles by transmission electron microscopy and dynamic light-scattering measurements. The grafting of the polymerizable surfactants onto the surface of the latex particles was checked by NMR and XPS measurements and was found to be efficient. Finally, polymerizations of appropriate formulations containing divinylbenzene with the polymerizable surfactant Tego XP-1008 in the presence of a larger amount of hydrophobic agent produced nanocapsules.
- SourceAvailable from: Katharina Landfester[Show abstract] [Hide abstract]
ABSTRACT: The purpose of this highlight is to demonstrate the importance of the surface functionalization of nanoparticles toward the design of high-tech (nano)materials. These (nano)materials are “nano-tools” for the already established interdisciplinary research fields of nanoscience and nanotechnology, which find an enormous variety of applications in different areas. In many cases, the particle-forming material, shape, and size determine the applicability of the desired nanoparticle. Nevertheless, in most of the cases other parameters must also be accurately adjusted to transform those nano-objects into functional nanoparticles, such as dispersibility, stability, reactivity, ability to recognize (or to be recognized by) other systems, and the interaction between these parameters and a matrix or dispersing medium. Most of these parameters are mainly depending on the surface characteristics of the nanoparticles. Thus, this highlight focuses not only on the importance of the surface functionalization of the nanoparticles to render them applicable, but also on the different strategies to design and obtain surface-functionalized nanoparticles (SF-NPs) and on their successful exploitation in materials science, formulation of organic–inorganic hybrid nanostructures and bio-applications.Current Organic Chemistry 05/2013; 17(9):900-912. · 3.04 Impact Factor
- Current Organic Chemistry 05/2013; 17(9):891 - 891. · 3.04 Impact Factor
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ABSTRACT: Two types of hybrid acrylic nanoparticles based on biodegradable and biocompatible polymers, cellulose ester and poly(ε-caprolactone), were produced via miniemulsification through high-pressure homogenization. An efficient emulsification procedure was first devised to yield high-solids-content polymer–monomer waterborne miniemulsions, and the fundamental parameters governing the stability of these composite miniemulsions were assessed. In addition, strategies to control the droplet size were investigated upon varying several experimental parameters such as the interfacial tension between the organic and the aqueous phase, the organic phase viscosity and the nature/concentration of surfactant. A series of thermally initiated polymerizations were then performed to produce nanosized hybrid particles.Colloid and Polymer Science 11/2013; · 2.16 Impact Factor