Ferroelectric liquid crystals from bent-core molecules with vinyl end groups
- Authors
- Kwon, SS; Kim, TS; Lee, CK; Shin, ST; Oh, LT; Choi, EJ; Kim, SY; Chien, LC
- Issue Date
- 20-Mar-2003
- Publisher
- KOREAN CHEMICAL SOC
- Keywords
- banana-shaped liquid crystal; switchable smectic C; spontaneous polarization; ferroelectric properties; bent-core molecule
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.24, no.3, pp 274 - 278
- Pages
- 5
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 24
- Number
- 3
- Start Page
- 274
- End Page
- 278
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/27030
- ISSN
- 0253-2964
1229-5949
- Abstract
- New banana-shaped achiral compounds, 1,3-phenylene bis [4-14-(alkenyloxy) phenyliminomethyl}benzoate]s were synthesized by varying the length of alkenyl group; their ferroelectric properties, are described. The smectic mesophases, including a switchable chiral smectic C (Sm C*) phase, were characterized by differential scanning calorimetry, polarizing optical microscopy and triangular wave method. The presence of vinyl groups at the terminals of linear side wings in the banana-shaped achiral molecules containing Schiffs base mesogen induced a decrease in melting temperature and formation of the switchable Sm C* phase in the melt. The smectic phases having the octenyloxy group such as (CH2)(6)CH=CH2 showed ferroelctric switching, and their values of spontaneous polarization on reversal of an applied electric field were 120 nC/cm(2) (X=H) and 225 nC/cm(2) (X=F), respectively. We could obtain ferroelectric phases by controlling the number of carbon atom in alkenyloxy chain of a bent-core molecule.
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