Anisotropic network formation by the photopolymerization of new monomers derived from 4‐hydroxybenzenethiol

Abstract

New polymerizable difunctional liquid crystals of monomers derived from 4-hydroxybenzenethiol were synthesized, characterized, and photopolymerized by the formation of anisotropic films. These films were obtained by the irradiation of the monomers in the mesophase with UV light before they were macroscopically oriented in glasses treated on the surface with polyimide and uniaxially rubbed. The monomers showed smectic and nematic mesophases. The thin films, uniaxially oriented, were optically transparent. The orientation was verified by IR dichroism, which showed a preferential order of mesogens.

Studies on electro‐optical properties of polymer matrix/LC/SiO2 nanoparticles composites

“…As a result, the agglomerates formed a rather strong network21, 22 in LC layers as shown in Figure 6, which shows the scheme of the inside structure of the sample in three different states. The hydrogen bonds between the SiO 2 particles surface OH groups and the LC molecules14 resulted in an effective interaction (a high anchoring strength) of the LC molecules with the SiO 2 particle surface. Therefore, a larger electric field was required to reorient LC droplets along the direction of the applied electric filed, which implied that the greater the SiO 2 nanoparticles content, the larger were the V th and V dr .…”

“…The polymerization‐induced phase‐separation (PIPS) method12–14 was used for the sample preparation. At first, SLC 7011‐100/TMHA/BDDA/SiO 2 nanoparticles composites were prepared (LC/monomers = 4/1 wt %, TMHA/BDDA = 4/1 wt %), 2.0 wt % of irgacure 651 was added as a UV‐curing photoinitiator.…”

Effect of a chiral dopant on the electro‐optical properties of polymer‐dispersed liquid‐crystal films

“…The following method5–7 was used for the sample preparation. At first, an SLC 7011‐100/BAOH/BHPA/CB15/photoinitiator composite was prepared.…”