A polyimide containing main-chain isosorbide units has been synthesized by polycondensation of an isosorbide-based diamine monomer and a dianbydride monomer(6FDA)in solution through a thermal imiderization reaction．The chemical structure and properties of the polyimide were characterized by using FTIR

1H-NMR

UV-Vis spectroscopy and thermal analysis．The polyimide thus obtained can be dissolved in polar organic solvents．such as DMF

NMP

DMAc

THF and CHCl3．The glass transition temperature(Tg)and the decomposition temperature (Td)of the pelyimide were measured to be 302℃ and 414℃(5％decomposed)

respective．The polymer doesn’tshow absorption for the light with wavelength longer than 400 nm．These results indicate that the polyimide pessesses good thermal stability and optical transparency in visible range．The polyimide is considered to be promising-for applications in optical and microelectronic devices．