Summary
Rigid rod copolyesters derived from 2,5-bis(pentyloxy)terephthaloyl dichloride (3), 4,4′-dihy-droxybiphenyl (4) and trans-1,4-dihydroxycyclohexane (5) were synthesized and their thermal behavior analysed. The structures were characterized by 1H-NMR, GPC and elemental analyses; their thermal behavior was studied by DSC measurements, microscopy under polarized light and thermogravimetric analyses. The composition of the copolyesters with 30, 50 and 70 mol % 5 was not as expected, due to the differing reactivities of the diols 4 and 5 during the polycondensation. This led to the existence of two species of polyesters from one reaction mixture. The higher the content of 5 in the polymer, the lower the molecular weight. By increasing the amount of 5, the thermal stabilities and melting points decrease drastically, whereas the solubility increases. The copolyesters 6a-g show only a low ability to form fibres which are brittle and break very easily.
Similar content being viewed by others
References
G. KO\MEHL, B. LUNDT (1994) Polym. Bull. (Berlin) 33: 497
G. KOßMEHL, B. LUNDT, in press
G. KOßMEHL, B. LUNDT, in press
H. R. DICKE, R. W. LENZ (1985) Angew. Chem. 131: 95
TH. SCHLEEH, G. KO\MEHL, G. HINRICHSEN (1990) Makromol. Chem. 191: 1075
H. R. KRICHELDORF, J. ENGELHARDT B. WEEGEN-SCHULZ (1991) Makromol. Chem. 192: 645
H. R. KRICHELDORF, B. WEEGEN-SCHULZ, J. ENGELHARDT (1990) Makromol. Chem. 192: 631
H. R. KRICHELDORF, J. ENGELHARDT. (1990) J. Polym. Sci.: Part A: Polym. Chem. 28: 2335
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ko\mehl, G., Lundt, B. Alkoxy-substituted liquid-crystalline aromatic copolyesters. Polymer Bulletin 34, 503–508 (1995). https://doi.org/10.1007/BF00423344
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00423344