Orientation dynamics of main-chain liquid crystal polymers. 2. Structure and kinetics in a magnetic field

J. S. Moore, Samuel I Stupp

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Abstract

Several aspects of molecular organization and dynamics in liquid crystal polymers have been revealed by orientation kinetics in a magnetic field. The technique used was pulsed broad-line proton NMR, and the polymers were liquid crystal copolymers synthesized in our laboratory. Interestingly, isothermal aging before application of the magnetic field leads to a drastic reduction in orientation time, reflecting the nonequilibrium nature of the mesophase structure. The fitting of data to a theoretical model of the orientation process plus other observations leads to the following conclusions. The liquid crystal fluid either is multiphasic or contains an interphase region in which chain segments have greater mobility and perhaps less order. At least for samples in nonequilibrium states, experimental results could be consistent with segments of a single chain traversing various orientationally ordered domains. This type of molecular organization may be viewed as a liquid fringed micelle.

Original languageEnglish
Pages (from-to)282-293
Number of pages12
JournalMacromolecules
Volume20
Issue number2
Publication statusPublished - 1987

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Liquid crystal polymers
Magnetic fields
Liquid Crystals
Kinetics
Micelles
Liquid crystals
Protons
Copolymers
Aging of materials
Nuclear magnetic resonance
Fluids
Liquids
liquid crystal polymer

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Orientation dynamics of main-chain liquid crystal polymers. 2. Structure and kinetics in a magnetic field. / Moore, J. S.; Stupp, Samuel I.

In: Macromolecules, Vol. 20, No. 2, 1987, p. 282-293.

Research output: Contribution to journalArticle

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