Optimal ionic strength for nonionically initiated polymerization

Autor:	Marta E. Dobrowolska, Ger J. M. Koper
Rok vydání:	2014
Předmět:	Gold for Gold Chemistry Osmolar Concentration Nucleation Ionic bonding Emulsion polymerization Natural development General Chemistry Condensed Matter Physics Microspheres Polymerization Ion Solvent Open Access Surface-Active Agents Chemical engineering Ionic strength Polymer chemistry
Zdroj:	Soft Matter, 2014,10
ISSN:	1744-6848 1744-683X
DOI:	10.1039/c3sm51998h
Popis:	Surfactant-free emulsion polymerization involving a nonionic, and hence uncharged initiator presents a new approach towards environmentally friendly procedures to synthesize latex particles. Under optimal solvent conditions, notably pH and ionic strength, the latex particles are stabilized by the natural development of ionic charge at the surface of the particles. We emphasize that the present process does not at all involve the addition of stabilizers such as surfactants or the creation of surface-active species from ionic initiators. The width of the size distribution is found to vary strongly with experimental conditions, notably the ionic strength and to a much lesser extent pH. The phenomenon is explained by a critical ionic strength dependence of the aggregation of the just nucleated primary particles into larger secondary particles, the so-called “coagulative nucleation” step.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eeff92acdaced75ce6856db653b74ebd https://doi.org/10.1039/c3sm51998h Zobrazit plný text záznamu