Abstract
An apparatus for measurement of dynamic mechanical properties of a polymer immersed in a liquid medium has been developed in this laboratory. The apparatus is based upon modification of the Vibron Viscoelastometer DDV-II. The viscoelastic properties of fibers immersed in liquids are of primary concern in textile processing. The dynamic mechanical properties of poly-(ethylene terephthalate) fibers immersed in dyeing media, such as water and tetrachloroethylene, were measured. The glass transition temperatures of polyester immersed in these dyeing media were significantly depressed from the dry glass transition temperature. A relationship between viscoelastic properties above the glass transition temperature of polyester fibers in tetrachloroethylene and the rate of disperse dyeing from tetrachloroethylene is proposed. The relationship is interpreted in terms of dye diffusion controlled by segmental mobility of amorphous regions of the polymer.
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