Phase structures, transition behavior and surface alignment in polymers containing rigid rod-like backbones with flexible side chains, 3. The even-odd effect on phase transitions in combined liquid crystal polyesters

✍ Scribed by Jason J. Ge; Paul S. Honigfort; Rong-Ming Ho; Shy-Yeu Wang; Frank W. Harris; Stephen Z. D. Cheng

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 217 KB
• Volume: 200
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/(sici)1521-3935(19990101)200:1<31::aid-macp31>3.0.co;2-l

✦ Synopsis

Nevertheless, this sequence does not represent a case of thermodynamic equilibrium. The K O and K T (s) phases in PEFBP(n = 9 and 11)s and the S A phase in PEBFP(n = 8 and 10)s are characteristics of the evenodd effect observed in this series of combined LC polyesters. The number of methylene units in the side chains thus plays a critical role in the formation of phase order and transition behavior in a way quite different from the common even-odd effect seen in main-chain LC polymers. Furthermore, this effect also indicates that the 4-cyanobiphenyl groups in the side chains are incorporated with the main-chain backbones to form the liquid crystal and crystal phases.