Authors

M. A. Qaddoura;K. D. Belfield

Comments

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Abbreviated Journal Title

Materials

Keywords

liquid crystalline texture; nematic phase; smectic phase; N-ALKOXYBENZOIC ACIDS; SIDE-CHAIN; NEMATIC PHASE; MOLECULAR-STRUCTURE; BENZOIC-ACIDS; POLYSILOXANES; TRANSITIONS; COMPLEXES; BEHAVIOR; SUBSTITUENTS; Materials Science, Multidisciplinary

Abstract

The liquid crystalline dimer of 4-(4-pentenyloxy) benzoic acid, a member of the n-alkoxybenzoic acid homologous series, was synthesized using potassium carbonate supported on alumina as catalyst. The acid dimer complex exhibited three mesophases; identified as nematic, smectic X1 and smectic X2. Phase transition temperatures and the corresponding enthalpies were recorded using differential scanning calorimetry upon both heating and cooling. The mesophases were identified by detailed texture observations by variable temperature polarized light microscopy. The nematic phase was distinguished by a fluid Schlieren texture and defect points (four and two brushes) while the smectic phases were distinguished by rigid marble and mosaic textures, respectively.

Journal Title

Materials

Volume

3

Issue/Number

2

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

827

Last Page

840

WOS Identifier

WOS:000298240300006

ISSN

1996-1944

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