This investigation focused on the opportunity of devulcanizing waste Rubber (WR) by ultrasonication to study the possibility of utilized as an added substance to replace with styrene‐butadiene rubber (SBR) in preparation process with the final aim of preparation new composites. The present work expects to compare the ultrasonic technique and the previous work on devulcanization by mechano‐chemical method. The influence of the ultrasonication treatment on the WR was explored by Fourier transform infrared, thermogravimetric analysis, scanning electron microscopy analysis revealed that ultrasonication was observed to be the best factor impacting the devulcanization procedure, this procedure suggests that use of specific levels of ultrasonic waves to the vulcanized rubber with a specific aim to accomplish a particular breaking of compound connections: scission of C‐S and S‐S bonds without break carbon–carbon (C‐C) bonds. Various blends of devulcanized WR with SBR was treatments with gamma ray then investigated and compared with find out the rubber giving the highest compatibility for compounding and revulcanization. In addition, a comparison of these results was made with the ones of raw SBR rubber compound. POLYM. ENG. SCI., 59:807–813, 2019. © 2019 Society of Plastics Engineers

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The effect of silicate load in waste ceramic dust on characteristics and performance of acrylonitrile butadiene rubber has been investigated. In order to enhance the interfacial adhesion between the rubber matrix and the filler, the latter was activated with two different types of coupling agents, vinyltriethoxysilane (SN) and maleic anhydride (MA), and then subjected to gamma rays at 100 kGy. Scanning electron microscopy, Fourier‐transform infrared spectroscopy, and X‐ray diffraction techniques were implemented to feature how the unmodified and modified waste ceramic dust were affected by the coupling agents. The effect of filler incorporation ratio on the physicomechanical and thermal properties of the rubber was studied. Mechanical properties, namely tensile strength, elongation at break, elastic modulus, and hardness, showed increases with both coupling agents. J. VINYL ADDIT. TECHNOL., 24:37–43, 2018. © 2015 Society of Plastics Engineers

In this article, we discuss the radiation effects and ethylene‐vinyl acetate (EVA) as compatibilizing agent on waste polyethylene (WPE)/virgin polyethylene (VPE), 80/20 wt%, reinforced by Kevlar fiber (Aramid). Hence, by melt mixing the compatibility between WPE and VPE will be performed by adding 10 phr fixed weight of EVA. After that various weights of Kevlar fiber at phr 1.5, 2.5, and 3.5 were reinforced into prepared polymer blend. The composites mechanical properties and the thermal stability were predicted. Furthermore, infrared and X‐ray diffraction used to characterize the composites structure. Improvements of both tensile strength and elastic modulus of prepared composites at 1.5 phr of Kevlar was observed and decreased in their values were noticed after that. Also, thermal stability has been enhanced with EVA and Kevlar fiber. Remarked improvements in studied parameters were generally determined by formation of crosslinking networks via gamma irradiation.

Seals prepared from acrylonitrile-butadiene rubber (NBR) are primarily used in nuclear services. Nevertheless, at relatively high ionizing radiation doses, NBR seal materials may undergo radiation-induced degradation processes, leading to adverse effects on the sealing ability life. Herein, to strengthen the functional characteristics of NBR seals against radiation, graphene oxide (GO) nanoparticles were prepared and characterized by transmission electron microscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR), and ultraviolet/visible spectroscopies. Various NBR/GO composites fabricated with different ratios of GO nanoparticles and in the presence or absence of carbon black (CB) were investigated via cross-linking density, scanning electron microscopy, XRD, FTIR, and mechanical and thermal stability analyses. The synergistic effect of the simultaneous presence of GO and CB on the NBR seal sensitization to gamma radiation up to a dose of 1 MGy was studied. The physicomechanical properties were enhanced by adding GO nanosheets up to 3 phr and by incorporating 35 phr of a CB with GO until 5 phr. Further, the application of γ-irradiation resulted in an overall enhancement in the mechanical, physical, and thermal stability of the prepared composites up to 0.5 and 1 MGy with GO nanosheets in the absence or presence of CB particles, respectively.The mechanical measurements indicated significant increments by loading with GO nanosheets in the absence and presence of CB as well as by irradiation. The tensile strength elevated up to about 121%, 336%, and 366% by adding 3 phr GO, 3 GO:35 CB phr, and 5 GO:35 CB phr, respectively. K E Y W O R D Sacrylonitrile-butadiene rubber seal, carbon black, gamma radiation, graphene oxide nanoparticles, mechanical and thermal characteristics, synergism

The effect of using gamma radiation on the prepared activated carbon (AC) from carbon black using dose 500 kGy was studied. Moreover, AC powder were blended in internal mixer to prepare thermoplastic elastomer with percentage (75/25/10) wt% based on waste polyethylene and waste rubber which irradiated before mixing at dose100 kGy separately and AC. Chemical activity of composites was improved as a result of using gamma radiation which was examined by electron spin resonance estimations. Composites were studied by different techniques, such as FTIR, mechanical, thermal, morphology, and X-ray diffraction. The results indicated that optimistic effect of using gamma rays with improving the properties of the composites. J. VINYL ADDIT.