Abstract
Studies of micromolecular transport (using acetone, dioxane and methylene chloride as penetrants) in a uniaxially oriented polymer (cellulose acetate) are described. The usual penetration rate measurements were supplemented by information about penetrant concentration and differential swelling stress distribution from colored tracer and birefringence profiles. Attention was focussed particularly on the difference in transport behavior when penetration occurs unidimensionally along or across the axis of preferred molecular orientation and its interpretation in terms of differences in the viscoelastic behavior of the polymer-penetrant system, on the basis of a simplified but physically meaningful model. Detailed interpretation of the transport behavior of methylene chloride (MC), which exhibits the most marked directional dependence, is described and it is shown that the progressively weaker directional dependence of acetone and dioxane transport can be understood on the same basis.
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