Abstract
AbstractConcentrated solutions of Acrilan 16 and 1656, Creslan 58 and 61, Orlon 42, and several experimental acrylic copolymers were prepared by dissolution of the staple fibers in 60% ZnCl2. The solutions were investigated rheologically. It was shown that a 3.5‐power relationship between the log of the Newtonian viscosity and the log of the molecular weight held for these solutions. Their elastic behavior as exhibited by the Barus effect was shown to be a function of shear stress and independent of molecular weight or composition. The ZnCl2 solutions of the acrylic fibers were spun under a harsh and a mild condition of coagulation. On physical and beinding properties of the fibers, mild coagulation has an effect similar to an increase in the content of the minor component of the copolymer. The loop properties and shrinkage of Turbo‐stretched fibers are shown to be mainly functions of their composition.
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