The cholesteric induction of (E, E)-1,4-bis(4-alkyl-2- hydroxystyryl)benzene substituent 2,3-O-(isopropylidene)-(L)-threitol
Date Issued
2009
Date
2009
Author(s)
Huang, Wan-Ting
Abstract
The cholesteric phase may be induced by the chiral dopants, which were dissolved in nematic liquid crystal. We have synthesized a series of 2,3-O-Isopropylidene-(L)-threitol derivative, modified with the oligophenylenevinylene (OPV) substituent at 2,3-position as mesogenic group. Here we modified the OPV moiety by alkylation, expecting the mesogenic group would have better alignment within the nematic liquid crystal. compared with previous results of non-alkylated OPV substituent, cholesteric phase appears when mesogenicroup with alkylation. We have successfully induced the cholesteric phase by the chiral dopants, and HTP of the chiral dopants is up to 12.
Subjects
cholesteric phase
helical twisting power
HTP
Type
thesis
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