چكيده به لاتين
Clean water is the basic need of living beings on this planet. During the past decades, the rapid development of human society has caused the production of large amounts of oily wastewater, which threatens human safety and the ecological system. Various techniques such as filtration, flocculation, flotation, absorption, biodegradation, etc. have been developed to treat oily wastewater. Meanwhile, the use of NR/SBR rubber with a limited use approach as an oil absorbent has been considered. In the upcoming research, an attempt was made to increase the contact angle by relying on the modification of the carbon black surface, in addition to increasing the mechanical properties, so that the composites made with the modified carbon blacks can also show good performance in absorbing oil stains. Hence, carbon black nanoparticles were functionalized once with 1, 5 and 10 concentrations of VTMS silane. Once again, in order to increase the number of OH groups on the surface, carbon black nanoparticles were first acidified with nitric acid and then silanized with concentrations of 1 and 2. These silanized nanoparticles were analyzed by ftir, TGA, XRD, BET and FESEM. In the next step, raw and modified carbon black were added separately to the NR/SBR matrix. Curing properties and mechanical properties were evaluated by MDR, DMTA, tensile test and FESEM analysis. Finally, the level of hydrophobicity and stain absorption for all three rubber samples was checked by testing the contact angle and absorption of different oils, including Persian Gulf oil. The results showed that the sample that was first acid washed was more silanized. The highest amount of CRI, tensile strength, £Tan, 300% modulus and Tg, reinforcement index and elongation at break were also related to this sample, which shows the better distribution and connection of this carbon black with the rubber matrix. The test of contact angle and stain absorption showed a good performance for the hydroxylated silane sample.
