Engineering the chemical structure of H-shaped reactive molecules for negative dispersion of retardation

Abstract

Five kinds of H-shaped reactive monomers with different central likage groups were newly designed and synthesized for obtaining the negative dispersion of retardation. The H-shaped molecules were mixed with cylindrical...

Effect of intra-cyclohexane rings in H-shaped reactive molecules on the negative dispersion of optical retardation

“…The LC242-HRM2 mixture showed PD when the We should note that the conversion from PD to ND of R in was shown at a smaller concentration of HRM2 compared to the HRM1 mixture. 17 In our previous paper, 5 kinds of the H-shaped RM were mixed with LC242 and ND of R in was observed when a benzene or a naphthalene moiety was substituted at the central imine linkage. The HRM1 molecule in Fig.…”

“…With further mixing of HRM2 over 80 wt%, the orientation was slightly degraded.The pure LC242 sample was UV-polymerized at 30 °C and showed a homogeneous orientation and a clear contrast with rotating between crossed polarizers. The data of the LC242-HRM1 mixture is described in the previous paper 17. The LC242-HRM2 mixture showed a homogenous planar orientation at room temperature up to 70 wt% HRM2.…”

“…In our previous publications, the dispersion of retardation was mainly MSDE Paper explained as the difference of the absorption wavelength along the n e and n o direction. 17 Although this is very important information for development of ND materials, there was no report on this issue. In this paper, we tried to answer this question by experimental investigation and theoretical calculation of the retardation dispersion using the HRM1 and HRM2 materials.…”

“…As described above, the PD-ND conversion of LC242 + HRM1 was shown when the HRM1 concentration was over 85 wt%. 17 On the other hand, the conversion of LC242 + HRM2 was shown when HRM2 was over 50 wt% [Fig. 4(b)].…”

“…Recently, our group has reported new kinds of H-shaped reactive molecules (HRM) showing ND of retardation. 17 In the previous study, we varied the chemical structure of the linkage groups in HRM and investigated their effect on the dispersion of retardation. Although ND of retardation was observed in some mixtures, the critical concentration for ND of retardation was over 85 wt%.…”