Abstract
In this article, two aspects were studied to enhance the properties of nitrile-butadiene rubber/polypropylene (NBR/PP) blends. First, three kinds of curing systems (dicumyl peroxide [DCP]/SnCl2·2H2O, SP-2402/SnCl2·2H2O, 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/SnCl2·2H2O at the amount of 10 wt%. Second, the effects of various proportions 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 decrease of plastic PP, the tensile strength, hardness, and melting index decreased, while the elongation at break increased. When the proportion m(NBR)/m(PP) was 70/30, the blends had the best properties, exhibited thermoplasticity, and could be extruded stably. This foundation for industrialization was established. It was also found that when NBR had more acrylonitrile, the blend has more oil resistant, and therefore should be applied when high oil resistance is required. The submicrocosmic structure was tested by transmission electron microscopy (TEM) analysis.
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