Minimization of free volume. Alignment of triptycenes in liquid crystals and stretched polymers.

TitleMinimization of free volume. Alignment of triptycenes in liquid crystals and stretched polymers.
Publication TypeJournal Article
Year of Publication2001
AuthorsLong, TM, Swager, TM
JournalAdvanced Materials (Weinheim, Germany)
Volume13
Pagination601–604
ISSN0935-9648
Keywordspentylcyclohexylbenzonitrile liq crystal triptycene host supramol ordering, triptycene host supramol alignment polyvinyl chloride free vol minimization
Abstract

Two triptycene derivs. were incorporated into a polyvinyl chloride (PVC) film or into the nematic phase of 4-(trans-4-pentylcyclohexyl)benzonitrile. The supramol. alignment taking place was visualized by polarized UV-vis and IR spectroscopy. The director axis of the nematic liq. crystal or the stretching direction of the polymer film are parallel to the the long axis of the guest mol. The degree of alignment for the 2 triptycene derivs. was detd. via the aspect ratio in comparison to anthracene. The alignment provided by the uniaxial PVC film was lower than that for the LC. A threading mechanism was proposed for the supramol. arrangement based on the minimization of the free vol. [on SciFinder(R)]

DOI10.1002/1521-4095(200104)13:8<601::AID-ADMA601>3.0.CO;2-V