Synthesis of liquid crystalline polysiloxanes containing naphthalene-based mesogens and chiral side chains

Chain-Shu Hsu*, Yi Jing Leu

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The synthesis and characterization of side-chain liquid crystalline polysiloxanes containing (2S)-2-chloro-4-methylpentyl 4-[(6-alkanyloxynaphthyl-2-yl)carbonyloxy]benzoate and (2S,3S-2-chloro-3-methylpentyl 4-[(6-alkanyloxynaphthyl-2yl)carbonyloxy]benzoate side groups are presented. All of the obtained polymers reveal respectively an enantiotropic smectic A phase. The phase transition temperatures of the obtained polymers depend on the spacer length. As the spacer length increases the glass transition temperature decreases while the isotropization temperature increases. The thermal stability of the obtained polymers increases as the spacer length increases. All of the obtained polymers present no chiral smectic C phase. The result seems to demonstrate that incorporation of a naphthalene ring in the mesogenic core decreases the tendency to form a chiral smectic C phase.

Original languageEnglish
Pages (from-to)83-95
Number of pages13
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume300
DOIs
StatePublished - 1 Jan 1997

Keywords

  • Naphthalene-based mesogen
  • Polysiloxane
  • Side-chain liquid crystalline polymer

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