Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Second-Order Optical Nonlinearity of a Polyamide derived from 4,$4^{\prime}$-[Hexafluoroisopropylidene]dianiline and 4-[N,N-Bis(2-carboxyethyl)] amino-$4^{\prime}$-nitrostilbene

  • Published : 1998.07.20
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Abstract

A new polyamide was prepared from 4,4'-(hexafluoroisopropylidene)di-aniline and 4-[NN-bis(2-carboxyethyl)] amino-4'-nitrostilbene. This polymer was cast into thin films by spin coating cyclohexanone solution. After being poled, the electro-optic coefficients of electrode poled polymer films were measured by the reflection measurement technique using an incident laser beam of 1.3 Jim. The film poled at the field strength of 1.2 V/μm exhibited the electro-optic coefficient (r33) of 5.9 pm/V. The relaxation behavior of the poled polymer film was compared with other reported polymers bearing the same NLO chromophores. Due to stiff and highly polar nature of the backbone and also due to formation of interchain hydrogen bonds, this polymer reveals a slower relaxation characteristics. The polymer is amorphous and soluble in various organic solvents.

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