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Published December 1988 | Published
Journal Article Open

Free boundary problems in controlled release pharmaceuticals: II. swelling-controlled release

Abstract

A problem in controlled release pharmaceutical systems is formulated and studied. The device modeled is a polymer matrix containing an initially immobilized drug. The release of the drug is achieved by countercurrent diffusion through a penetrant solvent with the release rate being determined by the rate of diffusion of the solvent in the polymer. The mathematical theory yields a free boundary problem which is studied in various asymptotic regimes.

Additional Information

©1988 Society for Industrial and Applied Mathematics. Received by the editors September 10, 1986; accepted for publication (in revised form) September 16, 1987. [D.S.C] was supported in part by U.S. Army Research Office (Durham) under contract DAAG29-85-K-0092, by the National Science Foundation under grant DMS-8706642, and by the Department of Energy under grant 7405/ENG-36 at the Center for Nonlinear Studies at Los Alamos. [T.E] was supported in part by the Air Force Office of Scientific Research under grant AFOSR85-0150 and the National Science Foundation under grant DMS-8701302.

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August 22, 2023
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