Modifikasi Bahan Elastomer Termoplastik Polipropilena/Karet Alam (PP/NR) Dengan Proses Pemvulkanisasian Dinamik
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Dynamic vulcanization process has been investigated to produce the thermoplastic elastomer that is polypropylene (PP) and natural rubber (NR) blend. The systems were prepared in rubber dominant with the ratio of PP/NR 30/70 (w/w). Dycumil peroxide (DCP), and N,N-m-phenylenebismaleimide (HVA-2) were chosen as crosslink agent with the concentrations of 1 phPP and 3 phr respectively. The combination of DCP (1 phPP) vulcanization with HVA-2 (3 phr) were also conducted during dynamic vulcanization process of PP/NR blend. Dynamic vulcanization process was done in an internal mixer at temperature of 180 oC and rotor speed of 50 rpm. The blends were then compressed in compression molding. The effects of crosslink agents on the properties of PP/NR blends viz. tensile properties, oil resistance, degree of crosslinking, and ageing properties were analyzed. Results showed that the consumption of combination DCP and HVA-2 have produce PP/NR blend with better properties as compared to the blend using DCP and HVA-2 alone. These cases were supported by the increase of the tensile strength, oil resistance and degree of crosslink. Here, the presence of HVA-2 together with DCP has been optimized the formation of crosslink and subsequently reduced the chain scission reaction which is often experienced on PP during dynamic vulcanization process with DCP.