It is shown that the addition of 2 to 6 wt.%of a chiral dopant (CD) to a series of nematic copolymers (Pn) induces blue and cholesteric mesophases. The mesomorphic behaviour of various CD + Pn mixtures is investigated by polarized optical microscopy and the phase transition temperatures are determined by DSC measurements. Deuterium NMR spectra are recorded as a function of temperature within the mesophases and the spectral line shapes characteristic of different local orientational order parameters and orientational ordering processes of molecules in a magnetic field are observed depending on temperature, heating or cooling process, chiral dopant concentration, copolymer composition, and magnetic field strength.

H-2-NMR of the induced Chiral Phases of Acrylate-Metacrylate Liquid Crystalline Polymers

CATALANO, DONATA INES MARIA;VERACINI, CARLO ALBERTO;
2005

Abstract

It is shown that the addition of 2 to 6 wt.%of a chiral dopant (CD) to a series of nematic copolymers (Pn) induces blue and cholesteric mesophases. The mesomorphic behaviour of various CD + Pn mixtures is investigated by polarized optical microscopy and the phase transition temperatures are determined by DSC measurements. Deuterium NMR spectra are recorded as a function of temperature within the mesophases and the spectral line shapes characteristic of different local orientational order parameters and orientational ordering processes of molecules in a magnetic field are observed depending on temperature, heating or cooling process, chiral dopant concentration, copolymer composition, and magnetic field strength.
Barmatov, E.; Calucci, L.; Catalano, DONATA INES MARIA; Chiezzi, L.; Veracini, CARLO ALBERTO; FODOR CSORBA, K.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/199229
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