The effect of coagulant on the structure and properties of poly(p-phenylene benzobisthiazole) fibers [PBZT]
Article first published online: 10 MAR 2003
Copyright © 1990 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 40, Issue 5-6, pages 823–833, 5 - 20 September 1990
How to Cite
Rakas, M. A. and Farris, R. J. (1990), The effect of coagulant on the structure and properties of poly(p-phenylene benzobisthiazole) fibers [PBZT]. J. Appl. Polym. Sci., 40: 823–833. doi: 10.1002/app.1990.070400518
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 21 JUN 1989
- Manuscript Received: 3 OCT 1988
Fibers spun from anisotropic solutions of a lyotropic rigid-rod polymer, poly(para-phenylene benzobisthiazole) [PBZT], were coagulated into homogeneous nonsolvents including a solution of 18% iodine/82% ethanol, ethanol, and water. The effect of these coagulants on the structure and mechanical properties of the PBZT fibers was studied. Structural and mechanical studies were performed on as-spun fibers. Wide-angle X-ray diffraction techniques have shown that fibers coagulated in the presence of iodine anions had d-spacings that were unique, as well as d-spacings that were characteristic of PBZT or iodine anions. Tensile and shear properties were highest in a fiber having a spin/draw ratio of 3 which contained 19.5% iodine species by weight. For these fibers, an average tensile strength of 2.2 GPa and a torsional modulus of 1.14 GPa was recorded. For fibers having this spin/draw ratio, and undergoing no post-processing heat treatment or tension drying, these values are much higher than would be expected.