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Manas Mahapatra,Mrinmoy Karmakar,Arnab Dutta,Nayan Ranjan Singha 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.9
Response surface methodology (RSM) optimized accelerator-to-sulfur (A/S) ratio was used to synthesize semi efficiently vulcanized styrene butadiene rubber (SBRSEV0) membrane possessing optimum balance between tensile strength (TS) and elongation at break (EAB). In addition, composite membranes, such as SBRSEV8, SBRSEV12 and SBRSEV24, were fabricated via incorporating 8, 12 and 24 wt% carbon black filler (CBF), respectively. The changes in physicochemical properties, as a result of crosslinking and CBF loading, were determined by analyzing CP MAS 13CNMR, FTIR, TGA, DSC, XRD, FESEM-EDX and crosslink densities. Several bi-/poly-sulfidic products, formed by crosslinking precursors of SBR in accelerated sulfur vulcanization, were examined to ascertain the unambiguous reaction mechanism. In this regard, an extensive density functional theory (DFT) based optimization was conducted to apprehend the relative variation in stabilities of several mono-/poly-crosslinked configurations by measuring dipole moments and ground state energies. Moreover, intrinsic membrane properties, such as partial permeabilities and diffusion coefficients, were measured at varying conditions. RSM was employed to optimize membrane efficiency resulting from individual and/or interactive effects of input variables. For the first time, systematic three-stage RSM based optimization (i.e., TS/EAB, total flux (TF)/separation factor (SF) and partial permeabilities) was used to ensure excellent balance between TS/EAB (5.78MPa/499.008% at 2.32 and 3.29 wt% of A and S, respectively), minimum TF/maximum SF (36.90 g m-2 h-1/202.46 at 35 oC, 0.97 wt% tetrahydrofuran (THF) and 24 wt% CBF) and minimum/maximum partial permeabilities of water/THF (2.94×10-8/4.64×10-8 Barrer at 35 oC, 0.97 wt% THF and 11.49 wt% CBF).
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Raju Prasad Mahto,Sharath Anishetty,Arnab Sarkar,Omkar Mypati,Surjya Kanta Pal,Jyotsna Dutta Majumdar 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.3
The use of aluminum in conjunction of steel can reduce the weight of structures but dissimilar materials welded structureresults in the formation of intermetallic compounds and inhomogeneous distribution of grains. Since aluminum is moreactive than the steel, the structures made from such dissimilar materials can be affected from corrosion medium which needsto be investigated. In the present work, friction stir welding has been used to join AA6061-T6 and AISI304 in lap configuration,each having a thickness of 1 mm under varied process parameters. The detailed investigations have been made whichincludes understanding the effect of process variables on microstructures, intermetallic compounds and their phases, andthereby on corrosion of the aluminum-steel welded joint. SEM with integrated EBSD detector and XRD analyses have beencarried out to characterize the weld interface that revealed the evolution of grain boundaries and existence of phases suchas Fe2Al5and AlCrFe2. The grain size of the weld zone has been found to be decreasing with increase in weld speed andplunge depth. The temperature profiles have shown a faster rate of heating and cooling with increase in welding speed andplunge depth which led to the refinement of microstructure. The evolution precipitates mainly comprised of Al, Mg and Sias the major elements. The corrosion rate was found to be increasing with decrease in grain size. Samples were corroded bypitting corrosion, inter-granular corrosion, and environmental corrosion. Severity of pits have been found to be non-uniformin the along weld cross-section.
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