INVESTIGATION OF THE EFFECTS OF DIFFERENT TYPE OF PLASTICIZERS ON NITRILE-BUTADIENE COMPOUNDS

A polymer is a molecule made by joining many small molecules called monomers. The word "polymer" can be broken down into "poly" and "mer". This shows how the chemical composition of a polymer consists of many smaller units (monomers) bonded together into larger molecules. Rubbers are elastomeric polymers that are not cross-linked but can be cross-linked. There are natural and synthetic rubbers in the literature. Acrylonitrile butadiene rubber (NBR) is a type of synthetic rubber widely used in various industries. Rubber formulations consist of different components with various properties. The plasticizers are one of the significant components of rubber formulation. In this study, Alkylsulphonic acid ester, Diisononyl Phthalate, Trioctyl Trimellitate Triethyleneglycol ester, Phthalic acid esters were used for comparison. Mechanical and thermal analyses were conducted for all formulations containing different plasticizers. The most resistant to low temperature in the Differential Scanning Calorimeter test is triethylene glycol ester at -45°C. On the other hand, this refers to the hardness change. tri-plasticizer has high change value than others. Tensile strength values increased after the ASTM oil aging tests. All the plasticizers improved the tensile strength values of the compounds in ASTM oils. The plasticizer with the lowest initial mechanical values. Aging tests in hot air and in ASTM oils were also investigated. The loss of elongation was parallel to the hardness change results. For all compounds, ASTM 3 effects more than ASTM 1 effects.