Effects of monomer structure on the morphology of polymer network and the electro‐optical property of reverse‐mode polymer‐stabilized cholesteric texture

Abstract

The morphologies of the polymer networks in the polymer network/LC composite of reverse-mode polymer-stabilized cholesteric texture (PSCT) films was observed. The polymer network/LC composite was prepared from photopolymerization of the acrylate monomers, which had rod-like rigid cores in monomer/LC mixture. The effects of the structure of the acrylate monomers on the morphology of polymer network were studied. The acrylate monomer without flexible pacers between the acrylate functional groups and the rigid core formed rice-grain-like polymer network with poor orientation. The acrylate monomer with flexible pacers formed fiber-like polymer network with better orientation. Meanwhile, the effects of morphology of polymer network on the electro-optical property of reverse-mode PSCT films were also investigated.

Applications and Degradation of Proteins Used as Tissue Engineering Materials

“…When implanted in vivo , these scaffolds retained their structural integrity over 1 month [119]. The electrospun silk fibroin/gelatin blend nanofibers showed excellent mechanical properties and good biocompatibility with human umbilical vein endothelium cells and mouse fibroblasts, which would be a good implant for blood vessel engineering application [120]. …”

22.4: Multi‐stable LCD with Dual‐frequency Reverse‐mode Polymer Stabilized Cholesteric Texture

“…Polymer Stabilized Cholesteric Texture (PSCT) has the advantages of polarizer-free, wide viewing angle, and bistable characteristics [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In such a device, low transmission is achieved by light scattering with focal conic (FC) state of cholesteric liquid crystal (ChLC).…”

Bistable switching of polymer stabilized cholesteric liquid crystals between transparent and scattering modes

“…Switching from scattering to clear (or reflective) states is defined as "normal mode" [3,16,17] and switching from reflective to scattering state as "reverse mode". [3,18,19] The operation mode (normal or reverse) is dictated primarily by the sample preparation conditions. Application of an electric field during photopolymerization aligns the polymer networks normal direction to the cell in the planar geometry.…”

“…[3,18,19] The operation mode (normal or reverse) is dictated primarily by the sample preparation conditions. Application of an electric field during photopolymerization aligns the polymer networks normal direction to the cell in the planar geometry.…”

“…The reflection of light from CLCs is naturally circularly polarized. If unpolarized incident light is exposed to the right-handed (RH) CLC, RH circularly polarized light (CPL) is reflected, whereas opposite handedness left-handed CPL is transmitted.A CLC can be prepared to be reflective or scattering [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] when the alignment is planar in the ground state (0 V). When the CLC is prepared from a positive dielectric anisotropy (+Δε) nematic liquid crystal host, the CLC can be switched to optically transparent by an applied electric field that orients the liquid crystal molecules into the homeotropic orientation.…”