Time Relaxation of the Light Transmission of PDLC films

Effect of Curing Process on the Dynamic Response of Polymer Dispersed Liquid Crystal Films

“…The irradiation dose of 105 kGy for EB irradiation corresponds to a maximum conversion of the acrylic double bonds with only a slight difference between the two cases. Figure 3 clearly shows that the relaxation time after application of an electric pulse is shorter for the EB‐cured film, which can be explained by the more homogeneous dispersion of LC domain dimensions and shapes in the EB‐case 22…”

“…Figure 3 clearly shows that the relaxation time after application of an electric pulse is shorter for the EB-cured film, which can be explained by the more homogeneous dispersion of LC domain dimensions and shapes in the EB-case. [22] Comparison of the Experimental Data with Theory The optical response of PDLC films can be described by a simple model based on a minimization of the total electrical and elastical energy of the nematic LC droplets (domains) dispersed in the polymer matrix. This model is based on the assumption that the internal configuration of the LC droplets is not significantly altered under the application of an external electrical field, and that only the droplet director changes its direction with the applied field.…”

Temperature Controlled Mechanical Reinforcement of Polyacrylate Films Containing Nematic Liquid Crystals

“…Polymerization and crosslinking reactions of monomer/LC mixtures may introduce phase separation processes that are likely to govern sample morphologies of the obtained polymer/LC films. Phase diagrams of monomeric TPGDA/E7, as well as from the corresponding UV-and EB-cured systems, were determined using several analytical techniques, such as light microscopy, differential scanning calorimetry, and light scattering, showing a one-phase region for both cured systems below 30 wt.% of LC, and a broad biphasic nematic + isotropic region above this concentration [36][37][38].…”