title: Order parameters <P2>, <P4>, and <P6> of aligned nematic liquid-crystalline polymer as determined by numerical simulation of electron paramagnetic resonance spectra.
abstract: High rank order parameters may comprise substantial information about molecular orientational distribution of liquid-crystalline materials. There are few experimental procedures targeted at the determination of high rank order parameters. We suggest a procedure for the determination of order parameters of a spin probe by numerical simulation of electron paramagnetic resonance (EPR) spectra. The procedure is based on revealing the molecular orientation axis of a spin probe. Order parameters <P(2)>, <P(4)>, and <P(6)> of the spin probe in aligned liquid-crystalline polymer have been measured by the suggested procedure. It was shown that the procedure gives more reliable and complete characteristics of molecular order than does polarized UV-visible spectroscopy.
authors.affiliation: Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Leninskiye gory, 1/3, Russia. ya.tatiana@gmail.com
authors.forename: T S
authors.initials: TS
authors.lastname: Yankova
authors.forename: A Yu
authors.initials: AY
authors.lastname: Bobrovsky
authors.forename: A Kh
authors.initials: AKh
authors.lastname: Vorobiev