Further characterization of the structure and the thermal transitions of poly(p-oxybenzoate-co-p-phenylene isophthalate) polymers
Article first published online: 10 MAR 2003
Copyright © 1990 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 40, Issue 9-10, pages 1499–1510, 5 - 20 November 1990
How to Cite
Tsai, H.-B., Lee, C., Chang, N.-S., Chen, M.-S. and Chang, S.-J. (1990), Further characterization of the structure and the thermal transitions of poly(p-oxybenzoate-co-p-phenylene isophthalate) polymers. J. Appl. Polym. Sci., 40: 1499–1510. doi: 10.1002/app.1990.070400907
- Issue published online: 10 MAR 2003
- Article first published online: 10 MAR 2003
- Manuscript Accepted: 2 OCT 1989
- Manuscript Received: 2 MAR 1989
A series of poly(p-oxybenzoate-co-p-phenylene isophthalate)s were prepared by melt polycondensation of p-acotoxybenzoic acid, p-phenylene diacetate, and isophthalic acid followed by solid-state polymerization. The solid-state polymerization not only increased the molecular weight, but also annealed the copolyesters. The thermal stability, liquid crystallinity, thermal properties, and solid-state crystallinity of these copolyesters were investigated by TGA, polarized microscope, DSC, and wide-angle X-ray diffraction, respectively. It was found that copolyesters with HBA content of 50, 60, and 70 mol % showed explicit melt birefringence at 370°C and thus exhibited liquid crystalline state. The effect of annealing during solid-state polymerization on the thermal properties was discussed. The effect of copolymerization on their crystallinity was interpreted with X-ray diffraction qualitatively.