Synthesis and characterization of side-chain liquid crystalline polysiloxanes containing (S)-2-methyl-1-butyl [6-(4-alkenyloxyphenyl)-carbonyloxy]naphthylene-2-carboxylate and (S)-2-methyl-1-butyl 6-[(4-alkenyloxy-biphenyl)-4′-carbonyloxy]naphthalene-2-carboxylate side groups

Chain-Shu Hsu*, Li Jen Shih

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The synthesis of side-chain liquid crystalline polysiloxanes containing either (S)-2-methyl-1-butyl [6-(4-hydroxyphenyl)carbonyloxy]naphthalene-2-carboxylate or (S)-2-methyl-1-butyl 6-[(4-hydroxybiphenyl)-4′-carbonyloxy]naphthalene-2-carboxylate moiety as mesogenic units and aliphatic spacers containing respectively three to eleven methylene units is presented. Differentical scanning calorimetry, optical polarizing microscopy, and X-ray diffraction measurements reveal smectic mesomorphism for all polymers. Most of the obtained polymers display only an enantiotropic smectic A phase. The temperature range of the mesophase formed increases with an increase in the spacer length. All of the synthesized polymers reveal no chiral smectic C phase. The experimental results demonstrate that incorporation of a naphthalene ring in the mesogenic core decreases dramatically the tendency to form a chiral smectic C phase.

Original languageEnglish
Pages (from-to)185-191
Number of pages7
JournalJournal of Polymer Research
Volume3
Issue number3
DOIs
StatePublished - 1 Jan 1996

Keywords

  • Liquid crystalline polymer
  • Naphthalene-based mesogen
  • Polysiloxane

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