Permeation Control of Oxygen Plasma-pretreated Expanded Poly(tetrafluoroethylene) Films Grafted with Acrylic Acid

摘要

A film of expanded poly(tetrafluoroethylene) abbreviated here as ePTFE shows no permeabilities in aqueous solutions because of its hydrophobicity. However, the film of ePTFE grafted with acrylic acid (ePTFE-g-PAA) by the combined use of oxygen plasma treatment and photografting gains excellent permeabiities of some hydrophilic solutes maintaining considerably high mechanical strength. In addition, the permeation of insulin through the ePTFE-g-PAA film can be controlled by controlled by the pH change in the medium. Using the enzymatic reaction of glucose oxidase with glucose, we have controlled the permeation of insulin through the ePTFE-g-PAA film.