Polar smectic phases in quasi-bent-core liquid crystals with hockey-stick-shaped mesogen: synthesis and crossover mesomorphism
- Authors
- Choi, E-Joon; Kim, Hye-Jin; Kang, Seung-Chang; Kim, Dae-Yoon; Jeong, Kwang-Un; Lee, You-Jin; Yu, Chang-Jae; Kim, Jae-Hoon
- Issue Date
- 14-Nov-2019
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Polar symmetry; hockey-stick liquid crystals; mesophase polymorphism; interdigitated bilayer structure; uniform texture
- Citation
- LIQUID CRYSTALS, v.46, no.13-14, pp 2042 - 2056
- Pages
- 15
- Journal Title
- LIQUID CRYSTALS
- Volume
- 46
- Number
- 13-14
- Start Page
- 2042
- End Page
- 2056
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28196
- DOI
- 10.1080/02678292.2019.1630492
- ISSN
- 0267-8292
1366-5855
- Abstract
- New hockey-stick-shaped liquid crystals (HSLCs) have been designed and synthesised. By extreme shortening of one 'arm' in the HSLCs, we have constructed the pronounced overall hockey-stick-shaped molecular conformation of these materials, and called the pseudo-rod-like (PRL) molecules with hockey-stick-shaped mesogen. The chemical structures were identified using spectroscopy and elemental analysis. The mesomorphic behaviour was investigated by polarising optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffractometry (XRD), and via electro-optical experiments. As a result, in spite of the PRL molecules, the various mesomorphic polymorphism, the interdigitated bi-layered structure and macroscopic polarity were found. Similar to up-to-date HSLCs, the quasi-bent-core LCs showed a transition from the synclinic SmC phase (SmCs) to anticlinic SmC (SmCa) phase, and exhibited SmA-type (N-CybA) and SmC-type (N-CybC) cybotactic nematic phases. At the same time, similar to practical rod-like LCs, the PRL molecules showed good surface alignment behaviour under planar boundary conditions. [GRAPHICS] .
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