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Proceedings Paper

Dielectric relaxation studies of x2 dye containing polystyrene films
Author(s): Michael A. Schen; Fred Mopsik
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Paper Abstract

The dielectric relaxation characteristics of narrow molecular weight distribution polystyrene (PS) films containing the second order nonlinear optical dyes, 4-[N,N- dimethylamino]-4'-nitrostilbene (DANS) and 4-[N-ethyl, N- hydroxyethylamino]-4'-nitroazobenzene (DR1), at a level of 0.19 mole percent, are reported using time domain dielectric spectrometry. Measurements ranging from 10-4 to 10+4 Hz have allowed us to closely examine sub-Tg dipolar losses that are associated with the dye. It is seen that the frequency range over which dye relaxations occur are similar to those characteristic of the sub-Tg (beta) transition of polystyrene though with grossly different dispersion amplitudes. The dye relaxation time activation energies are 131 kJ/mol and 79 kJ/mol for DANS and DR1 respectively. The dye relaxation amplitudes do not follow predicted T-1 behavior. Extremely broad dispersion curves imply a broad distribution of relaxation times. With physical aging, little change in (beta) amplitude is seen though a narrowing of the relaxation time distribution function seems to occur. Our results indicate that in a poling experiment with near ambient temperature aging, sub-Tg (beta) losses will account for losing 17 - 20% dye orientation within a matter of seconds after field removal. Relaxations occurring over longer times arise from a combination of (alpha) and (beta) losses.

Paper Details

Date Published: 1 December 1991
PDF: 11 pages
Proc. SPIE 1560, Nonlinear Optical Properties of Organic Materials IV, (1 December 1991); doi: 10.1117/12.50745
Show Author Affiliations
Michael A. Schen, National Institute of Standards and Technology (United States)
Fred Mopsik, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 1560:
Nonlinear Optical Properties of Organic Materials IV
Kenneth D. Singer, Editor(s)

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