A stable nonlinear optical material based on a polyimide/inorganic composite and its relaxation study
Conference
·
OSTI ID:141660
- Univ. of Massachusetts, Lowell, MA (United States)
A nonlinear optical (NLO) organic/inorganic composite based on an alkoxysilane dye and an aromatic polyimide has been investigated for its temporal stability and its molecular relaxation behavior. The spin-coated films have good optical quality before and after curing. Second order NLO coefficient d{sub 33} of a poled sample is determined to be 13.7 pm/V. The material retains 73% of this value even after being subjected to thermal treatment at 120{degrees}C for 168 hours. Dynamic mechanical and dielectric analysis were used for the investigation of the relaxation behavior. The effects of imidization and the sol-gel reaction on the relaxation behavior of the material was observed. As the sol-gel reaction proceeds the main chain motion of the polymer is restricted, increasing the {alpha} relaxation temperature of the composite. Secondary relaxations of the composite are also discussed. The molecular relaxation behavior is in agreement and correlated with the temporal stability of the second order NLO coefficient.
- OSTI ID:
- 141660
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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