90 ppm corresponds to the methylene attached to the oxygen in the alkyl chains of the mesogenic unit
and to the methynic proton b'.
Figure 4 presents the molecular model of the mesogenic unit of HBA-ETP (37, 38) and Fig.
The dimensions of the mesogenic unit have been used for the determination of the mean length and diameter of the rigid rods of HBA-ETP.
The diol monomer was designed to carry the mesogenic unit, which was selected to be the cyanobiphenyl group to produce materials with a strong dipole positioned along the long axis of the mesogenic unit.
In these polymers the mesogenic units are separated from the main chain by spacers of nine methylene units.
Blumstein, "Mematic and chlosteric thermotropic polyesters with azoxybenzene mesogenic units
and flexible spacers in the main chain, " J.
In this study, we synthesized a novel LC dicarboxylic acid curing agent (DACA), which is composed of 2,6-naphthalene and 1,4-phenylene mesogenic units
It has been indicated that the degree of overlapping between two mesogenic units
depends on their spacer lengths.
Liquid crystalline epoxies, which contain rigid mesogenic units
in place of the kinked and flexible structure of bisphenol-A, can be cured so that the resulting network has a liquid crystalline structure consisting of ordered domains of various sizes.
5A is less than two side-chains plus the backbone, suggesting an interdigitation of,the mesogenic units
between adjacent layers with on overlap of [nearly equal to] 12A, a distance that corresponds roughly to the molecular length of the mesogenic core.
The LCP containing triad aromatic ester type mesogenic units
, TR-4,6, however, revealed poor adhesion toward the PBT matrix.
Using DSC and 13C-NMR spectroscopy, we have studied, monomer sequence changes in a polyblends of PBT with a TLCP (TR4) consisting of triad aromatic ester type mesogenic units
and tetramethylene spacers along the main chain.