Effects of Curing Conditions on Electrooptical Properties of Polymer-Stabilized Liquid Crystal Pi Cells

Abstract

Recent (HI, x n ) data on rotational Yb and Hf nuclei are used to describe the motivations and techniques for pushing discrete-line spectroscopy to the realm of the weakly populated yrast and non-yrast states. Three aspects of these studies are discussed: extraction of moments of inertia in different aligned bands, observation and understanding of high-frequency band crossings, and dependence of feeding patterns on nuclear structure.

Effects of Composition and Polymerization Conditions on the Electro-Optic Performance of Liquid Crystal–Polymer Composites Doped with Ferroelectric Nanoparticles

“…The stabilization of an LC by a polymer network formed in the field-off state is well-known to result in higher driving voltages. Yet, a decrease in the driving voltage because of enhanced curing temperature was found by other researchers [ 25 , 26 , 27 , 28 , 29 , 30 ] and attributed to either larger pore sizes [ 25 ] or a lower fractal dimension of the network formed at elevated temperatures [ 29 , 30 ]. A voltage applied during the curing process was found in previous works to promote fast switching [ 31 ] or to imprint a bias effect on the switching behavior [ 32 ].…”

“…Many applications are feasible, owing to the huge variety of LC mesophases and the versatility of network morphologies [ 24 ]. In addition to different electro-optic properties of the LC, varying properties of the composites depending on the ratio of LC and polymer contents, varying orientational orders of the polymer, and different crosslinking densities, the conditions during polymer formation can influence the network morphology and the resulting behavior of the composites dramatically [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. The stabilization of an LC by a polymer network formed in the field-off state is well-known to result in higher driving voltages.…”

Trapping of defect point to improve response time via controlled azimuthal anchoring in a vertically aligned liquid crystal cell with polymer wall

“…A voltage of 3.6 V rms greater than the Freedericksz transition threshold (V th ) was then applied to the cell so that the reactive mesogen monomer and LC could be reoriented with a slight tilt angle from the surface in response to the electric field. In the presence of an electric field, the cell was exposed to UV light and thus the monomers were polymerized with a constant tilt angle at the surfaces through a photo-induced monomer diffusion process under optimal monomer weight per cent and UV curing conditions [10,[19][20][21][22]. Consequently, in the absence of an electric field, the LCs in the bulk relax to the original VA state while the surfaces have some defined pretilt angles.…”

Improved Nucleation and Transition by Plasma Treatments for Fast Response Optically-Compensated-Bend Displays

“…In order to promote a faster splay-to-bend transition, we introduced the partial irregularity in the liquid crystal alignment by atmospheric pressure plasma beam treatments. The effects on the increase in the number of bend nucleus sites were evaluated using the π cells constructed by a pair of polyimide (PI) alignment lm substrates rubbed in parallel angles [8,9]. The overall transition time has been signicantly reduced by the plasma beam bombardments of the PI alignment lms.…”