Polyimides of ether-linked aryl tetracarboxylic dianhydrides

Details Polyimides of ether-linked aryl tetracarboxylic dianhydrides Polyimides of ether-linked aryl tetracarboxylic dianhydrides

C - Chemistry, Metallurgy

08

G

402/221

C08G 73/10 (2006.01)

Patent

CA 1043046

ABSTRACT OF THE DISCLOSURE Polyimides comprised of repeating units having the struc- ture: Image wherein Rf is perfluoroalkylene having the structure -(CF2)-n or a perfluoroalkylene ether having the structure -(CF2)m-O-(CF2)-m where- in n is an integer of 2 to 10, and m is an integer of 1 to 10; x and y are each 0 to 3 and x + y = 0 to 5; and m' is 1 to 100 have been found to possess improved thermal, oxidative and hydrolytic stability as well as improved physical and chemical characteristics that make it useful in a variety of applications including that of a sealant in advanced aerospace structures.

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