We explore the influence of surface modification of SiO 2 on dynamic properties and heat buildup of semi-efficient vulcanisates filled by both SiO 2 and carbon black. Compared with untreated-SiO 2filled natural rubber (NR), vulcanisates reinforced by modified-SiO 2 presents not only better filler dispersity, mechanical properties and dynamic properties, as confirmed by scanning electron microscope and rubber processing analyser, but also lower heat buildup. Fourier infrared spectroscopy and cure characteristics indicates that silane coupling agent molecules grafted on the silica surface provoke an enhanced mobility of rubber chain and adsorb onto filler surface and then decrease the barrier of crosslink reaction. Moreover, composites with Si69-modified-SiO 2 show obviously the highest tear strength and lowest heat buildup attributed to that more sulphur released by Si69 also participate the vulcanisation reaction.
Abstract. Pyrolytic carbon black (PCB) made from used tires was used in ethylene-propylene-diene copolymers (EPDM). The microstructure of PCB was characterized by scanning electron microscopy (SEM). PCB was compounded with EPDM to prepare EPDM vulcanizates. The effects of PCB on the processing properties of EPDM compounds and the mechanical properties of vulcanizates were investigated and compared with other traditional fillers such as semi-reinforcing furnace black (N774), light calcium carbonate (CaCO3) and thermal black (N990). At the same time, the rheological behavior of EPDM compounds filled with different fillers was characterized by capillary rheometrics. The SEM photos showed that the particle shape was quiet different from that of CaCO3 and N990, it was similar to that of N774. The primary particle size was smaller than that of N774, but the aggregate size of PCB was larger than that of N774. The effect of PCB on the processing properties of EPDM compounds was similar to that of other fillers. Among the four fillers, PCB imparted EPDM compounds with higher Mooney viscosity. With the increase of filler content, the scorch time and optimum curing time of EPDM compounds changed little. The reinforcing effect of PCB was similar to that of N990, but inferior to that of N774. With the increase of PCB content, tensile strength, tear strength, and modulus at 100% elongation of EPDM vulcanizates increased significantly. When EPDM was filled with 50 phr PCB, the tear strength of EPDM vulcanizates increased by 3 times, compared with that of EPDM gum vulcanizates. The appearance of EPDM extrudate filled with PCB was coarser than that of other fillers.
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