Segregated liquid crystalline dendritic supermolecules - multipedes based on pentaerythritol scaffolds

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Abstract

A group of chiral nematic multipedal materials based on pentaerythritol containing two types of mesogenic sub-units were synthesised. The presence of different types of mesogens, the topology of the attachment to the core (end-on and side-on) and the chemical nature of the linking connection to the PE scaffold (ether, ester and tetramethyldisiloxane moieties) were used to tailor the mesomorphic properties. The related uniform tetramers have also been studied. The materials were characterised by a variety of techniques including H-1, C-13, Si-29 NMR spectroscopy, SEC, MALDI-TOF MS, DSC and POM. The crystalline state was found to be suppressed for most of the materials once they had experienced a first isotropisation process; all exhibited glass transitions near room temperature and accompanying wide temperature range mesophases. The parent supramolecular system carrving just terminally appended mesogens exhibited the smectic A phase, whereas the alternative parent material carrying only laterally attached chiral mesogens exhibited the chiral nematic phase.

Original languageEnglish
Pages (from-to)2727-2739
Number of pages13
JournalJournal of Materials Chemistry
Volume13
Issue number11
DOIs
Publication statusPublished - Nov 2003

Keywords

  • CHOLESTERIC POLYMER NETWORKS
  • MICRO-SEGREGATION
  • COLUMNAR MESOPHASES
  • SELF-ORGANIZATION
  • SIDE-CHAIN
  • DESIGN
  • MOLECULES
  • TWIN

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