Catalytic activity of cationic latices prepared according to the shot-growth method

Cationic latices as cocatalyst in the cobaltphthalocyanine-catalyzed oxidation of 2-mercaptoethanol

“…However, these results are in contrast with those obtained by Twigt et al [39], whose preparation technique had a large effect on the catalytic properties. Styrene/qVP latices prepared by shot-growth emulsion polymerization exhibited 10 times higher activity than latices, prepared by batch emulsion copolymerization, despite of a 2 times lower surface charge density.…”

Cationic Polymer Nanoparticles and Nanogels: From Synthesis to Biotechnological Applications

“…The best picture of the surface of a latex particle is a bare polymer surface (hydrophobic or hydrophilic depending on the polymer(s) used in the polymerization reaction) with some bound ionic groups distributed randomly on it. In some cases, a complete characterization of the surface charge density is carried out using the conductometric titration of amine on cationic ,,− or amphoteric − latexes. In a few cases, the surface charge density is examined using 1 H NMR, conductometry, and spectroscopy methods (UV, fluorescence). , Whereas the first method only provides semiquantitative information on the overall surface charge density, the latter two were more accurate and suitable for discriminating amidine (coming from the initiator) and amine (arising from the cationic monomer) surface ionic groups .…”

“…In the first case, cationic latexes promote hydrolyses and oxidation of organic compounds in aqueous dispersions by concentrating reactants and catalysis into the small volume of the latex phase and by increasing the intrinsic rate constants . However, in the second case, cationic latexes are used as simple supports, which exhibit a high surface area due to the small particle size. ,,− Polymer colloids were used as catalyst supports for the air oxidations of phenols, mercaptans, and alkyl aromatic hydrocarbons, for various oxidations of alkenes, and for the decarboxylation of 6-nitrobenzisoxazole-1-carboxylate. , …”

Research progress on the preparation and application of monodisperse cationic polymer latex particles

“…Moreover, research results of the Schork group11 and Forcada group12 indicated that surfactant‐free copolymerization of conventional monomers with functional monomers could reduce the particle size in comparison with homopolymers of conventional monomers. Several publications have reported emulsion copolymerization of hydrophobic monomers in combination with hydrophilic monomers 13–16. In the present review, we focus mainly on recent developments in the preparation of monodisperse polymer latex particles with cationic groups on the surface, and on the applications of cationic polymer latex particles.…”