Improving Liquid Crystal Alignment Ability and UV Sensitivity in Photodecomposition Polyimide Film

Liquid Crystal Alignment with a Photo-Crosslinkable and Solvent-Soluble Polyimide Film

P - 64 : UV - Light - Modified Polyimide Films for Liquid - Crystal Alignment

Infrared, UV-visible and X-ray photoelectron spectroscopy measurements indicate that bondbreaking and oxidation occur during broadband UVillumination of the polyimide film in the air. Surface tension and polarity are increased based on the measurements of contact angles. No obvious morphology change has been observed through atomic force microscopy analysis. While the polarized UVlight generate...

Ultraviolet light induced changes in polyimide liquid-crystal alignment films

Ultraviolet light induced changes in polyimide liquid-crystal alignment films were investigated. Infrared, UV-visible, x-ray photoelectron spectroscopy, and electron-spin-resonance measurements indicated that bond breaking and subsequent oxidation reactions occur in polyimide films ~SE7210, OCG284, DuPont 2555 and 2540! during the broadband UV illumination in air. Mechanical rubbing has no effe...

Characterization of Liquid Crystal Alignment on Rubbed Polyimide Film by Grazing-Incidence X-Ray Diffraction

We developed a new method for characterizing molecular distribution in very thin liquid crystal layer (5–40 nm) evaporated onto rubbed polyimide film used by grazing-incidence X-ray diffraction (GIXD). The diffraction peaks corresponding to intermolecular correlation perpendicular to longitudinal axis of liquid crystal molecule and the clear anisotropic distribution of liquid crystal molecules ...

Zenithal alignment of liquid crystal on homeotropic polyimide film irradiated by ion beam

We investigate the pretilt characteristics of a nematic liquid crystal [LC] in terms of ion beam exposure conditions on the homeotropic polyimide alignment layer. The pretilt angle of LCs in the case of high-energy ion beam treatment was decreased considerably almost the same to that of the homogenous alignment layer though we used homeotropic polyimide film at first. Increasing irradiating ene...