Abstract
It has been found that sudden changes in atmospheric vapor pressure of swelling agents result in a transient increase in mechanical damping in polymers. The effect was observed on both raising and lowering the vapor pressure. The systems investigated were: cellulose (paper)–water; cellulose (paper)–ammonia; gelatin–water; nylon 66–water; cellulose acetate–acetone; poly(vinyl acetate)-acetone; rubber hydrochloride–chloroform; and polystyrene–benzene. The damping was measured with a low-frequency torsional pendulum. The results suggest that the transient damping effect is associated with diffusion processes taking place in the sample during attainment of equilibrium.
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