The orientational properties of two mesomorphic azobenzene-containing polyacrylates are investigated by ESR spectroscopy using the spin probe technique. Procedures to achieve a uniform alignment of the director in the presence of a static magnetic field are described in detail. The recovery of the alignment after the creation of controlled non-equilibrium states in the presence of a magnetic field is studied. It is found that the recovery time is proportional to the reciprocal square of the static magnetic field, analogous to that which occurs in low molar mass liquid crystals.
ESR STUDIES OF THE ORIENTATIONAL AND REORIENTATIONAL PROPERTIES OF MESOMORPHIC POLYMERS
ANDREOZZI, LAURA;CHIELLINI, EMO;GIORDANO, MARCO;LEPORINI, DINO
1993-01-01
Abstract
The orientational properties of two mesomorphic azobenzene-containing polyacrylates are investigated by ESR spectroscopy using the spin probe technique. Procedures to achieve a uniform alignment of the director in the presence of a static magnetic field are described in detail. The recovery of the alignment after the creation of controlled non-equilibrium states in the presence of a magnetic field is studied. It is found that the recovery time is proportional to the reciprocal square of the static magnetic field, analogous to that which occurs in low molar mass liquid crystals.File in questo prodotto:
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