Abstract
Abstract A considerable structural difference exists between Hevea latex films vulcanized after drying and those vulcanized in the latex state. Since these two types of films differ considerably in water vapor permeability and sorption, a careful study has been made of these phenomena. The weight of water permeating an uncompounded film was inversely proportional to the thickness of the film over a wide range of thicknesses, and directly proportional to Δp, the vapor pressure difference across the film, except at very high values of Δp. However, films cast from vulcanized latex were much more permeable to water vapor, sorbed considerably less water, and had a greater negative temperature dependence of permeability than uncompounded or dry vulcanized films. These experiments indicate that diffusion takes place in prevulcanized films by an activated diffusion through capillary holes and in dry vulcanized films by an activated diffusion through the polymer itself or the adsorption layer.
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