Mechanical and electrical properties of polyimide blend films

摘要

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 reprted earlier~(1,2). PMDA-ODA and nylon 6 blend films have shown up to 14.7% increase in Young's moudulus 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 PB 2 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 moudulus and 47% higher tensile strength at lowerelongation. But in general the dielectric constant of the 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 deg, 100 deg 200 deg C and at 1,5 and 10 kHz frequency increases with increase in the percentage of nylon 6 in the blend and the breakdown voltage decrease with the increase in nylon 6 content in the blend films.