Accession Number : ADA256128


Title :   Characterization of Cholesteric Cyclic Siloxane Liquid Crystalline Materials


Descriptive Note : Interim rept. Jul 1989-Jun 1991


Corporate Author : WRIGHT LAB WRIGHT-PATTERSON AFB OH


Personal Author(s) : Bunning, Timothy J ; Klei, Herbert E ; Samulski, Edward T ; Adams, W W ; Crane, R L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a256128.pdf


Report Date : Nov 1991


Pagination or Media Count : 72


Abstract : The preliminary investigation of a new type of a liquid crystalline material is described. These cyclic cholesteric siloxanes exhibit selective reflection which can be varied from the UV to the NIR by changing composition. DSC, TGA, SEK, TEM, UV-VIS-NIR spectroscopy, and polarized optical microscopy (POM) were used to obtain preliminary information on the thermal, optical and macroscopic packing behavior as it related to possible optical applications of these materials. Considerable effort was also employed in examining the wide- angle and small-angle X-ray scattering (WAXS and SAXS) patterns obtained from these materials in a variety of forms including film, fiber, and powder samples. Liquid Crystal, X-Ray Diffraction, Cholesteric, Electron Microscopy, Siloxane Smectic, Spectroscopy.


Descriptors :   *MATERIALS , *LIQUID CRYSTALS , *X RAY SCATTERING , *WIDE ANGLES , ANGLES , OPTICAL EQUIPMENT , SCATTERING , ANNEALING , FIBERS , X RAY DIFFRACTION , CRYSTALS , X RAYS , CHOLESTEROL , ORGANIC MATERIALS , ANISOTROPY , DIFFRACTION , ELECTRONS , ELECTRON MICROSCOPY , MICROSCOPY , SILOXANES , BULK MATERIALS , BEHAVIOR , MOLECULAR STRUCTURE , PATTERNS , REFLECTION , FILMS , POWDERS , STABILITY , SPECTROSCOPY , LIQUIDS , THERMODYNAMICS


Subject Categories : Organic Chemistry
      Crystallography
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE