Preparation of Latex Carriers for Controlled Release by Concentrated Emulsion Polymerization

Authored by: Kyu-Jun Kim , Eli Ruckenstein

Concentrated Emulsion Polymerization

Print publication date:  April  2019
Online publication date:  March  2019

Print ISBN: 9780367134556
eBook ISBN: 9780429026577
Adobe ISBN:

10.1201/9780429026577-19

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Abstract

Spherical latexes of submicron diameter containing a model hydrophobic herbicide, namely, 2-(2,4-dichlorophenoxy)-propionic acid, were prepared by the concentrated emulsion polymerization method. A mixture of styrene, herbicide, and initiator was dispersed into a small amount of water (6% by volume based on the entire emulsion) containing surfactant, at room temperature. The heating at 40°C of the foam-like gel thus obtained led to the formation of latexes containing the herbicide. It was found that the model herbicide dispersed in the polymer latex was released to water over a period of several weeks and that the amount released was strongly dependent upon temperature and latex concentration in water.

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