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Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid-Rod Aromatic Poly(amic ethyl ester)s

Title data

Neuber, Christian ; Schmidt, Hans-Werner ; Giesa, Reiner:
Polyimide Fibers Obtained by Spinning Lyotropic Solutions of Rigid-Rod Aromatic Poly(amic ethyl ester)s.
In: Macromolecular Materials and Engineering. Vol. 291 (November 2006) Issue 11 . - pp. 1315-1326.
ISSN 1438-7492
DOI: https://doi.org/10.1002/mame.200600256

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Summary: Fibers were spun from a lyotropic solution of a high-molecular-weight ( = 5.89 g · dL-1), rigid-rod, fully aromatic polyimide precursor polymer in a dry-jet, wet-spinning process in NMP. Acetone was identified as the coagulant of choice since fibers could be drawn extensively in this solvent, resulting in improved mechanical properties (tensile modulus: E = 17 GPa, strength at break: break = 400 MPa, elongation at break: break = 5.3%) and orientation, which was shown by WAXS patterns. SEM images showed a layered, skin-core morphology without any visible fibrillation. Additional processing of these fibers by step-wise hot-drawing up to 400 °C under tension rendered oriented polyimide fibers with excellent mechanical properties. (E = 68 GPa, break = 700 MPa, break = 1%). An analysis of the WAXS diffraction patterns showed an improved orientation of the fibers in the axial and lateral directions; however, probably due to the CF3 side groups, the lateral distance was still too large for crystallization. SEM images of these imidized fibers showed, for the first time, a fibrillar morphology in addition to the typical, skin-core, sheet-like morphology.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I > Chair Macromolecular Chemistry I - Univ.-Prof. Dr. Hans-Werner Schmidt
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Collaborative Research Centers, Research Unit
Research Institutions > Collaborative Research Centers, Research Unit > SFB 481 Komplexe Makromolekül- und Hybridsysteme in inneren und äußeren Feldern
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 30 Jun 2015 07:53
Last Modified: 30 Jun 2015 07:53
URI: https://eref.uni-bayreuth.de/id/eprint/1360