The alcohol, 2(S)-[2(S)-methylbutyloxy]propanol (l), containing two centres of chirality was used as a chiral building block to prepare two series of new FLCs. The first series, 4-{2(S)-[2(S)-methylbutyloxy]propoxy)phenyl 4-n-alkoxybenzoate (7-lo), exhibits monotropic S,* and S, phases at or below room temperature. The second series, 4,4-{2(S)-[2(S)-methylbutylbutoxy]propoxy}biphenyl 4-n-alkoxybenzoate (11-15), possesses enantiotropic S,* and N* phases. The S z phase temperature range is up to 37°C. The spontaneous polarization of 22-32 n C cn-' was measured in the series of the FLCs 11-15. The comparison experiments indicate that the dipoles of the two chiral centres in the alcohol 1 add in the S$ phase so that the Ps value of the new FLCs are enhanced.
Two products were isolated at a result of esterification of acrylic acid with 4-[4-(nhydroxyundecanyloxy)phenyl] benzoic acid (5). One is 4-[4-(n-acryloloxy-undecanyloxy)phenyl] benzoic acid (6), and tile other is 4-{4-[n-(3-acryloloxy-propionyloxy)undecanyloxy]phenyl}benzoic acid (7) which contains two molecules of acrylic acid. Compound 7 is obtained unexpectedly and still unknown in the literature. Its identification is confirmed by the isolation and characterization of the monomer 9. The mesogenic monomers 8 and 9 which were synthesized from 4-hydroxyphenyl 2(S)-[2(S)-methylbutoxy]propionate (4) and the corresponding acrylates 6 and 7 exhibit the enantiotropic Sc* and Sa phases. The Sc* phase temperature range is up to 31 C. The spontaneous polarization and response time for the monomers 8 and 9 is 97 and 16 nC/cm 2 as well as 90 and 64 Its respectively. It is the liquid crystal side chain polymer 11, not 1D, which is switchable in the presence of an electric field. The spontaneous polarization of 36 nC/cm e and the response time of 3.1 ms is obtained from the new polyacrylate.
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