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۱Devulcanization of Ground Tire Rubber Powder by Reactive Mixing Process; Effect of Modifier
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
Scrap tires, as the post–consumer waste, have been subjected to incineration or landfill. However, these methods result in severe environmental problems such as air pollution. Recycling of waste rubber is becoming a more serious issue that the rubber industry faces in recent years due to crosslinked molecular structures of the vulcanized rubber which prevents further processing. Devulcanization of waste rubber and reuse it like the virgin rubber or serve as a substitute for virgin rubber is considered as an optimum method to resolve the problem. In this work, high shear stress and high temperature in the presence and absence of the residue substance of crude oil refineries as the modifier was employed to devulcanize rubber powder. Devulcanization process was carried out in an internal mixer at temperature of 2000C and rotor speed 90 rpm and in presence of different amount (0, 10, 20, 30, 40 and 50%) of modifier. Performing Fourier Transform Infrared (FTIR) test on the mixed product revealed devulcanization of the rubber. The yield of devulcanization was investigated by measuring crosslink density of the product through using swelling test and Florry Rheiner equation. The obtained results showed that increase in the amount of the used modifier resulted in higher reduction of crosslink density<\div>

۲Study on Morphology–Rheology of Nanocomposites Based on an Immiscible Rubber Blend and Organoclay
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
The effect of various organo–modified–layered nanosillicates (Closite 30B: C30B and Closite 15A: C15A) on the rheological, morphological, and structural properties of immiscible acrylonitrile butadiene rubber\styrene butadiene rubber (SBR\ NBR) blends was investigated. Compounds based on different ratio of the SBR\NBR containing organoclay were mixed in an internal mixer at temperature of 90°C and then the rheological behavior and melt viscoelastic properties of the samples were studied by rheometric mechanical spectrometry (RMS) at a temperature of 160°C. X–ray diffractometer (XRD), and Scanning Electron Microscopy and Energy Dispersive Spectroscopy (SEM\EDS) were used to investigate the structure and morphology of the nanocomposites. XRD’s results showed that Mooney viscosity of the rubber and the affinity between organo clay and the rubber affected the expansion of the gallery height which was confirmed by RMS’s results. Image analysis of the SEM\EDS elemental mapping showed a significant reduction in the size of NBR droplet for the filled SBR\NBR (80\20) blend. Wetting parameter was calculated to figure out the affinity between the nanoparticles and the rubbers and also it was used to predict the final location of the organoclay in the blends. The results showed higher affinity of NBR and SBR with C30B and C15A respectively. The same result was obtained by rheological study of the samples and an enhancement of melt elasticity due to increase in compatibility was observed for them<\div>
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