Antiferroelectric achiral mesogenic polymer

Ferroelectricity in Achiral Liquid‐Crystal Systems

“…Motivated by this potential application we exploited the electrostatic force, together with other secondary interactions, to selectively attach capsules onto a surface as a model of drug delivery and targeting. Using microcontact printing [5] and LbL assembly techniques, Hammond and co-workers have developed a polymer-on-polymer stamping (POPS) procedure using strong and weak polyions to fabricate patterned polyelectrolyte multilayers, which have been used as templates for charged-particle assembly. [6] Through this procedure, patterned micrometer-scale functional structures can be created on top of a polyelectrolyte platform formed on different substrates, such as metals, oxides, and plastics.…”

“…[5,6] Of particular interest is the fact that neither of the two components, by themselves, manifested this behavior. The mixtures show antiferroelectric polarization hysteresis curves in the smectic C phase and, after undergoing a poling process by cooling to the glassy state, revealed high pyroelectric responsesÐof potential interest for applications such as IR or piezo-detectors.…”

“…In accordance with our previous work, [5,6] the same nomenclature is used: PMnRm where P denotes the backbone polymer; Mn is a methacrylate group with n methylene units as the aliphatic spacer; Rm is a rigid resorcylphenylimine group core (R) possessing an alkoxy flying tail with m methylene units located in the para position and bonded to Mn. The composites consist of the side chain polymer PM6R12 and different monomers, such as M4R5, M4R6, and M4R8 (homologs of the M6R12 monomer), mixed in a 2:1 molar ratio.…”

“…Although the studied sample of our previous papers, [5,6] PM6R8-33, manifests a clear antiferroelectric behavior, the new composites show pronounced ferroelectric switching, a phenomenon that needs to be reviewed. We will give the piezoelectric coefficient d 31 , pyroelectric coefficient c, and spontaneous polarization P s for the composites studied herein.…”

“…The measurements were carried out on cooling under a DC bias field of E = 10 V lm ±1 , which corresponds to the saturation voltage. It is important to note that, as well as in the case of antiferroelectrics mixtures, [5,6] the pyroelectric signal is negligible when individual components are taken separately. On transition from the clearing point to the bilayer smectic C2 phase, c increased from 0.02 nC cm ±2 K to 4 nC cm ±2 K. The small signal response in the isotropic phase might be understood as being induced by the electric-field-and temperaturedependent polarization effect.…”