Some nove polyimides containing bisthiazole rings were prepared by reacting 2

2'-diamino-4

4'-bisthiazole (DABT) with different aromatic dianhydride. The polyimidesobtained had inherent viscosities of 0.37--0.82 dl/g. Thermogravimetric analysis of thepolyimides showed good thermal stability the temperature at 5% weight loss being from450°to 560℃. The permeability of two polymer membranes to H2

O2 and N2 was deter-mined

respectively Three kinds of polyimide films were converted into electrical conductor by pyrolysis at high temperature in nitrogen atmosphere.The maximum room temperature conductivity as high as 3.9×102S/cm for PI film pyrolyzed at 1200℃ for 10 min was obtained

and it was very stable in air.