The influence of compatibilizers on nitrile-butadiene rubber and polypropylene (NBR/PP) blends

Four kinds of compatibilizers-chlorinated polyethylene (normal CPE), highly chlorinated CPE, maleic anhydride grafted with polypropylene (MP), and chl orinated polypropylene (CPP)-were used to study the influence of compatibil izing agents on the properties of nitrile-butadiene rubber and polypropylen e (NBR/PP) blends, a kind of thermoplastic elastomer (TPE), The results sho w that the most proper amount of normal CPE, highly chlorinated CPE. MR and CPP are 9, 8, 7, and 6 wt%, respectively, in the NBR/PP blends. The CPP wa s the best compatibilizer for NBR/PP blends among the four. NBR/PP blends o btained excellent properties of thermoplastic materials and can be molded w ith the general processing technologies for thermoplastics. such as injecti on, extrusion, blow molding, and the like. The mechanical properties are si milar to that of Geolast, produced by Monsanto Company, and exceed the Chin ese national criterion (GB7527-87). The tensile strength was 13.8 MPa; the elongation at break was 290%, and the compression set was 32%. After the bl ends were immersed in oil for 70 h, the tensile strength was 10.4 MPa, and the degree of oil absorption was 12%. The compatibility of the blends was c onsistent with the morphology from transmission electron microscopy (TEM).