Stabilised columnar mesophases formed by 1: 1 mixtures of hexaalkoxytriphenylenes with a hexaphenyltriphenylene-based polymer

Research output: Contribution to journalArticle

  • Authors:
  • Sholto R. Mclaren
  • Daniel J. Tate
  • Owen R. Lozman
  • Georg H. Mehl
  • Richard J. Bushby

Abstract

The synthesis is reported for a main chain polymer in which the repeat units are 2,3,6,7,10,11-hexaphenyltriphenylene moieties linked through flexible dodecyl chains. In compositions with a series of 2,3,6,7,10,11-hexakis(alkoxy)triphenylenes (HATn) this new polymer forms stable hexagonal columnar liquid crystal phases. These are investigated in detail using optical polarised microscopy (OPM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). In these mixtures, suppression of crystallisation and enhancement of the clearing temperatures leads to very wide liquid crystal ranges: much wider than those for the HATn materials on their own. For the longer chain HATn compounds (n = 12-16) a columnar rectangular phase is also observed. The enhancement of the liquid crystal phase range is attributed to stabilising complementary polytopic interactions between the planar aromatic moieties.

Bibliographical metadata

Original languageEnglish
Pages (from-to)5754-5763
Number of pages10
JournalJournal of Materials Chemistry C
Volume3
Issue number22
DOIs
StatePublished - 14 Jun 2015