Effect of Novolac on Mechanical and Physical Properties of Nitrile Rubber (NBR)

Abstract

This research aims to study the effect of addition novolac material (phenol formaldehyde resin, polar) on the mechanical and physical properties of nitrile rubber (NBR) and the proportion of addition novolac material is(0,10,20,30,40,50 pphr) to a sample of nitrile rubber containing 40 part per hundred rubber (pphr) carbon black as a proportion stationary been prepared with (factors of vulcanization, accelerators and activators using two-roll mill laboratory, molds, thermal piston and difference of examination conditions from pressure, temperature and time according to the ASTM), all tests were conducted in the laboratories of the college of materials engineering - university of babylon and laboratories of babylon tire company. Then carrying out the process of scheduling the results of laboratory testing and study its diagrams. Where the results showed the mechanical properties increase in hardness, modulus of elasticity, and resistance to compression, and improved a little in the tear resistance, especially when the amount of novolac are 10 and 20 pphr, and a decrease in properties (tensile strength, elongation at break and resilience), also results show increase in adhesion with polyester fibers and nylon fibers when increasing novolac material. While the results of the physical properties show primitive increase in viscosity, the greatest torque twisting, scorch time and cure time, then decrease for to increasing novolac material. specific gravity also increases with increasing novolac material.