Hostname: page-component-78c5997874-g7gxr Total loading time: 0 Render date: 2024-11-02T23:36:47.822Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanical and Electrical Properties of Heat-Treated Ladder Polymer Fiber

Published online by Cambridge University Press:  25 February 2011

C. S. Wang ,
C. Y-C Lee  and
F. E. Arnold
C. S. Wang
Affiliation:
University of Dayton Research Institute, 300 College Park Drive, Dayton, OH 45469–0168
C. Y-C Lee
Affiliation:
Materials Directorate, Wright Laboratory, Wright-Patterson Air Force Base, OH 45433–6533
F. E. Arnold
Affiliation:
Materials Directorate, Wright Laboratory, Wright-Patterson Air Force Base, OH 45433–6533
Get access

Abstract

The ladder polymer poly[(7-oxo-7H, 10H-benz(d, e)imidazo(4', 5':5, 6)-benzimidazo(2, l-a)isoquinoline-3, 4:10, ll-tetrayl)-10-carbonyl] (BBL) was synthesized in polyphosphoric acid (PPA) at a concentration of 15% by weight. The polymer had an intrinsic viscosity of 8.75 dl/g in methanesulfonic acid (MSA) at 30°C. Highly oriented BBL fiber was spun by a dry-jet wet-spin process with a spin-draw-ratio of 8 to 1. After neutralization, the fiber exhibited a phosphoms content below the detectable limit (0.04%) by elemental analysis. This fiber, after a heat treatment at 300°C for 30 seconds under tension, showed a Young's modulus of 120 GPa, a tensile strength of 830 MPa and a compressive strength of 410 MPa. The fiber was also heat-treated at temperatures from 100°C to 600°C at 50°C increments for electrical conductivity measurements. It was found that room temperature DC conductivity of the BBL fiber increased dramatically from 2×10−8 S/cm with 100°C heat treatment to 3×10−4 S/cm with 350°C heat treatment and then decreased to 6×10−7 S/cm with 600°C heat treatment. The enhanced conductivity of heat-treated BBL fiber is believed due to the improved structural order in the BBL fiber and the thermally excited charge carriers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 747
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Electronic Properties of Polymers and Related Compounds, Solid-State Sciences 63, 2 (1985), edited by Kuzmany, J., Mehring, M. and Roth, S..Google Scholar
2. Cao, Y., Smith, P. and Heeger, A. J., Polymer, 32, 1210 (1991).Google Scholar
3. Kim, O. K., J. Polym. Sci.: Polym. Lett., 20, 662 (1982); Mol. Cryst. Liq. Cryst., 105, 161 (1984).Google Scholar
4. Jenekhe, S. A., ACS Polym. Mat. Sci. Eng., 60, 419, (1989).Google Scholar
5. Jenekhe, A. J., J. Polym. Sci.: Part B: Polym. Phys., 26, 201 (1988).Google Scholar
6. Belaish, I., Rettori, C., Davidov, D., McLean, M. R., Dalton, L. and Nalwa, H., in The Materials Science and Engineering of Rigid-Rod Polymers, edited by Adams, W. W., Eby, R. K. and McLemore, D. E. (Mater. Res. Soc. Proc. 134, Pittsburgh, PA 1989) pp. 689–695.Google Scholar
7. Coter, F., Belaish, Y., Davidov, D., Dalton, L. R., Ehrenfreund, E., McLean, M. R. and Nalwa, H. S., Synth. Met. 29, E471 (1989).Google Scholar
8. Arnold, F. E. and Van Deusen, R. L., Macromolecular Synthesis, 7 31 (1979).Google Scholar
9. Wang, C. S., Bai, S. J. and Rice, B. P., ACS Polym. Mat. Sci. Eng., 61, 550 (1989).Google Scholar
10. Krause, S. J., Haddock, T. B., Vezie, D. L., Lenhert, P. G., Hwang, W. F., Price, G. E., Helminiak, T. E., O'brien, J. F. and Adams, W. W., Polymer, 29, 1354 (1988).Google Scholar
11. Dalton, L. R., Thomson, J. and Nalwa, H. S. Polymer, 28, 543 (1987).Google Scholar