Studies on Dry Spinning of Polyurethane-Urea Elastomers: Theory and Experiment

Studies on Dry Spinning of Polyurethane-Urea Elastomers: Theory and Experiment Numerical computations of the fundamental equations for dry spinning were carried out for various spinning conditions of polyurethane-urea elastomers. Steady-state solutions obtained give the spinline cross sectional area, spinline temperature, spinning tension, spinline deflection and solvent concentration profile within a filament. These are described as a function of the distance measured downward from the spinneret. Dry spinning experiments were conducted for the binary component system of polyurethane-urea and dimethylfomamide solvent. The spinning variables were changed mainly in terms of throughout, take-up speed, ambient temperature and so on. Good linear correlations between theory and experiment were obtained for the solvent concentration in a filament and the spinline deflection. On the other hand, tensile tests and molecular orientation measurements for as-spun fibers were carried out to obtain a relationship of the fiber properties to the output variables from computations. The stresses at the 100% and 300% elongations in the stress-strain curves, respectively, were found to become large proportionally with increase of the calculated stresses at the take-up point. This may be related to the molecular orientation of as-spun fibers, especially the orientation of hard segments. It was found that the simulation program of dry spinning is very useful in finding http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Polymer Engineering de Gruyter

Studies on Dry Spinning of Polyurethane-Urea Elastomers: Theory and Experiment

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Publisher
de Gruyter
Copyright
Copyright © 1986 by the
ISSN
0334-6447
eISSN
2191-0340
D.O.I.
10.1515/POLYENG.1986.6.1-4.237
Publisher site
See Article on Publisher Site

Abstract

Numerical computations of the fundamental equations for dry spinning were carried out for various spinning conditions of polyurethane-urea elastomers. Steady-state solutions obtained give the spinline cross sectional area, spinline temperature, spinning tension, spinline deflection and solvent concentration profile within a filament. These are described as a function of the distance measured downward from the spinneret. Dry spinning experiments were conducted for the binary component system of polyurethane-urea and dimethylfomamide solvent. The spinning variables were changed mainly in terms of throughout, take-up speed, ambient temperature and so on. Good linear correlations between theory and experiment were obtained for the solvent concentration in a filament and the spinline deflection. On the other hand, tensile tests and molecular orientation measurements for as-spun fibers were carried out to obtain a relationship of the fiber properties to the output variables from computations. The stresses at the 100% and 300% elongations in the stress-strain curves, respectively, were found to become large proportionally with increase of the calculated stresses at the take-up point. This may be related to the molecular orientation of as-spun fibers, especially the orientation of hard segments. It was found that the simulation program of dry spinning is very useful in finding

Journal

Journal of Polymer Engineeringde Gruyter

Published: Dec 1, 1986

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