Thermotropic liquid crystals of main-chain polyesters having a mesogenic 4,4′-biphenyldicarboxylate unit. 8. X-ray analyses of structural change on SA to SC transition

✍ Scribed by Junji Watanabe; Manabu Hayashi; Masatoshi Tokita

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 504 KB
• Volume: 30
• Category: Article
• ISSN: 1381-5148
• DOI: 10.1016/1381-5148(96)00027-2

✦ Synopsis

We have prepared main-chain liquid crystalline copolyesters made from biphenyldicarboxylic acid as a mesogenic component and a certain mixture of 2-methylbutanediol and hexanediol as spacer components. These copolymers exhibit the novel polymorphism with the smectic A as a higher temperature mesophase and the smectic C phase as a lower temperature one. The transition behavior of smectic A to smectic C has been examined by X-ray diffraction method and the layered structure of smectic C phase has been described by a comparison with the preceding smectic A structure.