Study of nitrile-butadiene rubber and polypropylene (NBR/PP) grafting cross-linked system

In this article, two aspects were studied to enhance the properties of nitr ile-butadiene rubber/polypropylene (NBR/PP) blends. First, three kinds of c uring systems (dicumyl peroxide [DCP]/SnCl2. 2H(2)O, SP-2402/SnCl2. 2H(2)O, sulfur/DM) were added into the blends to study the influence of the curing system on NBR/PP blends. It was found that the best curing system is SP/Sn Cl2. 2H(2)O at the amount of 10 wt%. Second. the effects of various proport ions of rubber-plastic on the properties of NBR/PP blends were explored. It was tested that, in a certain range, with the increase of rubber NBR and d ecrease of plastic PP, the tensile strength, hardness, and melting index de creased, while the elongation at break increased. When the proportion m(NBR )/m(PP) was 70/30, the blends had the best properties, exhibited thermoplas ticity, and could be extruded stably. This foundation for industrialization was established. It was also found that when NBR had more acrylonitrile, t he blend has more oil resistant, and therefore should be applied when high oil resistance is required. The submicrocosmic structure was tested by tran smission electron microscopy (TEM) analysis.