Premium
Synthesis and thermotropic properties of novel side‐chain dimer liquid crystalline polymers
Author(s) -
Scheerder Jurgen,
Marcelis Antonius T. M.,
Achten Remko,
Sudhölter Ernst J. R.
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20000801)201:12<1303::aid-macp1303>3.0.co;2-b
Subject(s) - thermotropic crystal , mesogen , side chain , liquid crystal , polymer , monomer , polymer chemistry , materials science , dimer , lyotropic , liquid crystalline , chemistry , organic chemistry , composite material , optoelectronics
A new class of side‐chain liquid crystalline polymers with polymethacrylate or polyether backbones and two different mesogenic moieties in one side‐chain, i.e. a biphenyl group and a cholesterol group, have been synthesized. The thermotropic behavior of both, the monomeric precursors and the polymers, has been investigated. The monomers exhibit smectic A and chiral nematic phases and the polymers exhibit smectic A mesophases. For both, monomers and polymers, the isotropization temperatures and the corresponding dimensionless entropy changes ΔS/R depend on the parity of the spacer between the two mesogens. Replacement of the biphenyl group in the polymethacrylates by a phenyl group lowers the isotropization temperatures, but the smectic A phase is retained.