Mechanical and electrical properties of polyimide blend films

Abstract

The preparation and characterization of two novel polyimide, one from pyromellitic 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. PMDA-ODA and nylon 6 blend films have shown up to 14.7 % increase in Young's modulus and 25% increase in tensile 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 PB2 which shows about 1% increase in ultimate tensile strength ). BTDA-ODA and nylon 6 blend films have shown 19 % higher ultimate tensile strength as well as 42 % higher Young's modulus and 47 % higher tensile strength at lower elongation. But in general the dielectric constant of the blend films (both BTDA and PMDA based) measured at 23°, 100° and 200°C and at 1,5 and 10kHz frequency increases with increase in the percentage of nylon 6 in the blend and the breakdown voltage decreases with the increase in nylon 6 content in the blend films.