Absorption of low molecular weight compounds in aqueous dispersions of polymer‐oligomer particles, 2. A two step swelling process of polymer particles giving an enormous increase in absorption capacity

Abstract

A novel method for preparation of stable emulsions of slightly water soluble compounds is described. The method implies that the slightly water soluble compound diffuses through water and becomes absorbed into polymer particles which in a previous step have been brought to absorb a water insoluble, relatively low molecular weight compound. By this two step swelling process the polymer particles can be brought to absorb more than 100 times their own volume of the low molecular weight compounds to form stable o/w emulsions of the latter, with high oil content, and with a droplet size and size distribution which is completely determined by the size of the polymer particles in the latex applied initially. Monodisperse emulsions with large droplet size could easily be prepared. When the slightly water soluble compound added in the second step is a vinyl monomer which may subsequently be polymerized, the method represents a seed technique which is especially favourable for preparation of latexes with large particles size, including monodisperse latexes, with high solid content.

Production of micron-sized monodispersed polymer particles by seeded polymerization for the dispersion of highly monomer-swollen particles prepared with submicron-sized polymer seed particles utilizing the dynamic swelling method

“…In a previous article, 8 the absorption rate of styrene into 1.84 m-sized PS particle utilizing DSM was discussed using a following eq. (2), which was suggested by Ugelstad et al [11][12][13][14] dV m dt…”

An Unexpected Molecular Imprinting Effect for a Polyaromatic Hydrocarbon, Anthracene, Using Uniform Size Ethylene Dimethacrylate Particles

“…Uniformly sized EDMA polymer particles were prepared through a typical multi-step swelling and polymerization method [16]. First, polystyrene seed particles used as shape templates were prepared by an emulsifier-free emulsion polymerization method, as reported elsewhere [17].…”

Uniform-Sized Molecularly Imprinted Polymer Material for Propranolol. Recognition of Propranolol and Its Metabolites

“…Preparation of uniformly sized, macroporous, molecularly imprinted polymer beads as well as non-imprinted polymer beads by a multi-step swelling and polymerization method was carried out as follows. A water dispersion of the uniformly sized, polystyrene seed particles (0.497 g ml -1 ), 0.17 ml, was admixed with a micro-emulsion prepared from 0.48 ml of dibutyl phthalate as activating solvent 20 , 0.02 g of sodium dodecyl sulfate and 5 ml of distilled water by sonication. This first-step swelling was carried out at room temperature for 15 h with stirring at 125 rpm until micro oil droplets were completely disappeared.…”