Modern Polymer Spect..

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WAVENUMBER I cmd
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Figure 2-29. Comparison of the reference (top)
and power (bottom) spectra intensities of the
FLCP for the reorientation process during
poling the external electric field.
4r
1500 2000 2500 3000
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Figure 2-30. Schematic representation of the
segmental motions of the FLCP during poling
the electric field.
POLARITY SWITCH
RESPONSE
of novel SCLC-polyesters [ 151 are presented. In unoriented polyester films with a
dodecamethylene spacing of the ester groups in the main chain, holograms with a
resolution of 6000 linesjmm can be recorded by the interference of an Argon-ion
laser beam [95]. The thermal erasure and rewriting of the laser-induced alignment in
the SCLC polyesters is the basis for such storage processes. In order to investigate
the mechanism of the involved processes in more detail, a variable-temperature,
computer-controlled sampling system for on-line polarization FTIR nieasurements
during laser irradiation as well as thermal erasure has been designed and
constructed.