Non-Aqueous Interfacial Polycondensation: A Novel Technique for the Encapsulation of Water-Soluble Solids

Bernd J. Hessbrugge and Atul M. Vaidya
University of Strathclyde, Department of Chemical Engineering, 75 Montrose St., Glasgow G1, 1XJ, United Kingdom
J. Chem. Educ., 1997, 74 (11), p 1322
DOI: 10.1021/ed074p1322
Publication Date (Web): November 1, 1997

Abstract

The encapsulation of water soluble solids, such as salts, in solvent resistant and mechanically robust polymers is a task fraught with difficulties. Conventional encapsulation techniques are unsuitable either due to the limited chemical stability of the encapsulates or the problems imposed by the water soluble nature of the encapsulates. This article describes a novel encapsulation technique. The method, a variant of conventional interfacial polycondensation, well known through the demonstration called the "Nylon Rope Trick", involves the creation of an interface between two mutually immiscible organic liquids at which the polycondensation reaction between an acid dichloride and a polyfunctional amine takes place to produce a highly solvent resistant coating of a polyamide around the encapsulates which are surrounded by the more polar reactant.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Organic Chemistry

Keywords (Subject):

Separation Science
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  • Received: August 03, 2009

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