A new series of siloxane liquid crystalline dimers exhibiting the antiferroelectric phase

Olsson, Nils,1970Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg (författare)

In this paper, we report the study of a new series of symmetric chiral liquid crystalline siloxane dimers, their related monomers, and two of those monomers with heptamethyltrisiloxane attached. All the dimers coupled with a trisiloxane show the SmCA phase, which in several cases has a large tilt angle greater than 40° over a wide temperature range, as well as high spontaneous polarisation in the field-induced ferroelectric state. Spacer lengths of 3-6 and 11 carbons between the siloxane central unit and the mesogenic cores were used. Monomers with 3-6 carbons in the spacer showed only orthogonal phases while the monomer with an 11-carbon spacer, as well as the monomers with siloxane attached, have a high tilt angle ferroelectric phase. The materials were characterized by means of DSC, NMR, X-ray diffraction, electro-optical methods (tilt angle and texture characterization) and polarization measurements.

Helgee, Bertil,1947Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Chalmers tekniska högskola,Chalmers University of Technology,University of Gothenburg(Swepub:gu)xhelbe (författare)
Andersson, GunnarGöteborgs universitet,University of Gothenburg (författare)
Komitov, Lachezar,1944Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg(Swepub:gu)xkomla (författare)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

Av författaren/redakt...: Olsson, Nils, 19 ...; Helgee, Bertil, ...; Andersson, Gunna ...; Komitov, Lacheza ...

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