Comparison between Polyimide and Bismaleimide Effect on Mechanical Properties and Ageing Resistance of Nitrile Rubber

Nitrile rubber composites were prepared by the addition of asbestos, bismaleimide (BMI) and polyimide (PI). The effect of asbestos, bismaleimide and polyimide on mechanical properties and ageing properties were studied. The results showed a little decrease in tensile strength from 17.3 Mpa of pure NBR composite to 16.95, 11.78 and 11.95 for NBR/PI(25) composite, NBR/Asbestos(25) and NBR/BMI(25) composites respectively. Elongation results showed an increase from 331% for pure NBR composite to 367% for NBR/Asbestos (25) then decreased to 245% in NBR/Asbestos (100). NBR/BMI elongation increased as filler content increased reaching 393% for NBR/BMI (100). NBR/PI elongation decreased as filler content increased reaching 217% for NBR/PI (100). Hardness results showed an increase from 64.25 for pure NBR composite to 80, 82.5, 87 for NBR/Asbestos (100), NBR/BMI (100), NBR/PI(100) composites respectively. The prepared composites found to offer a high percentage of retention of physical properties after aging in high temperatures. Compressions set results show good recovery properties where the compression set of pure NBR composite, NBR/BMI (25), NBR/PI (25) and NBR/Asbestos (25) are 5.97%, 15%, 11.9% and 7 respectively.