DTIC ADA096032: Study of Polymeric Nematic Phases pdf

DTIC ADA096032: Study of Polymeric Nematic Phases

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An experimental determination of the persistence length of an aromatic polyamide-hydrazide, X-500, was undertaken to compare values obtained by light scattering, intrinsic viscosity, and small angle x-ray diffraction. Corrections for molecular weight heterogeneity are well known and should be applied. The status of the treatment excluded volume effects for non-gaussian wormlike chains is not currently adequate. We were unsuccessful in an attempt to obtain experimental values of the entropy changes at the crystal-nematic and nematic-isotropic transitions for a thermotropic nematic polymer. This arose from the difficulty in identifying the nematic phase in highly viscous thermotropic polymers. Investigations of flow instabilities created by an electric field indicates this procedure may furnish a convenient conformatory test for thermotropic nematic phases. (Author

• Creator/s: Defense Technical Information Center
• Date: 2/12/1981
• Year: 1981
• Book Topics/Themes: DTIC Archive, Krigbaum, W R, DUKE UNIV DURHAM N C DEPT OF CHEMISTRY, *LIGHT SCATTERING, *MOLECULAR WEIGHT, *POLYAMIDE PLASTICS, *X RAY DIFFRACTION, ANGLES, POLYMERS, COMPARISON, ELECTRIC FIELDS, PHASE, LIQUID CRYSTALS, LIQUID PHASES, LENGTH, ISOTROPISM, TRANSITIONS, AROMATIC COMPOUNDS, VALUE

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