Molecular motion and orientation distributions in melt-processed, fully aromatic liquid crystalline polyesters from [formula omitted] NMR

Fully-aromatic thermotropic liquid crystalline polymers (LCP) containing 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid (HNA) were studied with 1 H NMR. A two- or three-parameter nematic director distribution in molten or nearly molten samples was obtained via rigorous simulation of wide...

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Bibliographic Details
Published inSolid state nuclear magnetic resonance Vol. 12; no. 2; pp. 97 - 112
Main Authors Gentzler, Michael, Patil, Siddharth, Reimer, Jeffrey A., Denn, Morton M.
Format Journal Article
LanguageEnglish
Published Elsevier Inc 01.09.1998
Subjects
Liquid crystal polymer
Molecular motion
Orientation distribution
Molecular motion
Orientation distribution
Liquid crystal polymer
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Summary:Fully-aromatic thermotropic liquid crystalline polymers (LCP) containing 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid (HNA) were studied with 1 H NMR. A two- or three-parameter nematic director distribution in molten or nearly molten samples was obtained via rigorous simulation of wideline spectral lineshapes. This methodology was further employed to yield the chain director distribution in macroscopic sections derived from a frozen contraction flow. In addition, the dynamic conformation of polymer chains through the melting transition was monitored via lineshape analysis of samples having (bulk) isotropic director distributions. Extension of rigorous 1 H NMR spectral deconvolution to recently developed solid-state NMR imaging sequences is discussed.
ISSN:0926-2040
1527-3326
DOI:10.1016/S0926-2040(98)00056-3