Annealing effects on the thermal properties of liquid crystalline polyurethanes
Article first published online: 10 MAR 2003
Copyright © 1994 John Wiley & Sons, Inc.
Journal of Polymer Science Part A: Polymer Chemistry
Volume 32, Issue 13, pages 2559–2563, October 1994
How to Cite
Szczepaniak, B., Frisch, K. C., Penczek, P. and Rudnik, E. (1994), Annealing effects on the thermal properties of liquid crystalline polyurethanes. J. Polym. Sci. A Polym. Chem., 32: 2559–2563. doi: 10.1002/pola.1994.080321319
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 12 APR 1994
- Manuscript Received: 19 OCT 1992
- main-chain liquid crystalline polymers;
- thermotropic polyurethane;
- annealing effect
This work is a continuation of our earlier investigations of liquid crystalline polyurethanes prepared from 4,4′-bis(2-hydroxyethoxy) biphenyl (BHBP), 2,4-tolylene diisocyanate (TDI), and poly (oxytetramethylene) diols (PTMO). The annealing effects on the thermal properties of the investigation polyurethanes are presented for three samples with the same BHBP content, different flexible spacer length, and different molecular weight of the polyurethanes. The annealed polyurethanes were investigated by means of DSC, and polarizing microscopy. The results of the thermal analysis show that the temperatures of phase transitions depend on the annealing temperature and time. These dependences are different for different molecular weights. © 1994 John Wiley & Sons, Inc.