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

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

Helgee, Bertil, 1947 (author): Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),Chalmers tekniska högskola,Chalmers University of Technology,University of Gothenburg

Komitov, Lachezar, 1944 (author): Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU),University of Gothenburg

(creator_code:org_t)

Informa UK Limited, 2005
2005
English.
In: Liquid Crystals. - : Informa UK Limited. - 0267-8292 .- 1366-5855. ; 32:9, s. 1139-1150

Related links:: https://gup.ub.gu.se...; show more...; https://doi.org/10.1...; https://research.cha...; show less...

Abstract Subject headings

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.

NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP -- Kemi -- Polymerkemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Polymer Chemistry (hsv//eng)
NATURVETENSKAP -- Kemi -- Organisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Organic Chemistry (hsv//eng)

By the author/editor: Olsson, Nils, 19 ...; Helgee, Bertil, ...; Andersson, Gunna ...; Komitov, Lacheza ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Polymer Chemistr ...

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Organic Chemistr ...

By the university: University of Gothenburg; Chalmers University of Technology

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