Mechanical and electrical properties of polyimide blend films

The preparation and characterization of two novel polyimide, one from pyrom ellitic dianhydride (PMDA)-4,4 ' -oxydianiline (ODA) and the other from 3,3 ', 4,4 ' -benzophenone tetracarboxylic dianhydride (BTDA)-ODA, blend films with nylon 6 were reported earlier(1,2). PMBA-ODA and nylon 6 blend films have shown up to 14.7 % increase in Young's modulus and 25 % increase in te nsile strength at lower elongation over those of control films, whereas the same films have shown around 4.6 % decrease in ultimate tensile strength ( except the film PB 2 which shows about I % increase in ultimate tensile str ength). BTDA-ODA and nylon 6 blend films have shown 19 % higher ultimate te nsile strength as well as 42 % higher Young's modulus and 47 % higher tensi le strength at lower elongation. But in general the dielectric constant of the blend films (both BTDA and PMDA based) measured at 23 degrees, 100 degr ees and 200 degreesC and at 1,5 and 10 kHz frequency increases with increas e in the percentage of nylon 6 in the blend and the breakdown voltage decre ases with the increase in nylon 6 content in the blend films.