Influence of azo-chain concentration on thermo-optic properties of fluorine-containing polyimides
Journal Title: Science Paper Online - Year 2007, Vol 2, Issue 5
Abstract
Attenuated total reflection (ATR) configuration is used for thermo-optic coefficients ( ) and coefficients of thermal expansion ( ) investigation of fluorine-containing polyimides with azo side-chain concentration of 0~22wt% in TE- and TM-polarized lights, respectively. Results indicate that the values of and increase linearly with the azo side-chain concentration. Moreover, the polarization dependence of thermo-optic coefficients ( ) and the difference of coefficients of thermal expansion ( ) increase linearly with the azo side-chain concentration as well. The behavior of thermal expansion is a more important factor to determine the thermo-optic properties than refractive and polarizability for polyimides.
Authors and Affiliations
Hongxiang Song, Chengxun Wu
Keywords
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