Synthesis and characterization of liquid crystalline copolysiloxanes containing azobenzene dyes and 1,3-dioxane based mesogenic side groups

Ging Ho Hsiue*, Jiunn Shyang Wen, Chain-Shu Hsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The synthesis and characterization of nine side-chain liquid crystalline copolysiloxanes containing trans-5-(n-undecanyl)-2-(4-cyanophenyl)-1,3-dioxane and 4-(alkanyloxyphenylazo)benzonitrile side groups are presented. The azobenzene dye contents in the copolymers range from about 5 to 20 wt.-%. The nature of the mesophase exhibited by the copolysiloxanes depends very much on the dye concentration. Three copolysiloxanes which contain about 5 wt.-% azobenzene dye, display a smectic A phase while the other six copolysiloxanes which contain more then 10 wt.-% azobenzene dye, exhibit a nematic phase. All the obtained copolysiloxanes show a very low glass transition temperature and a very wide temperature range of mesophase.

Original languageEnglish
Pages (from-to)141-148
Number of pages8
JournalPolymer Bulletin
Volume30
Issue number2
DOIs
StatePublished - 1 Feb 1993

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