epoxy – polysulfide copolymers without or with low amounts of epoxy in their structure have poor mechanical properties in oxidative curing system.to strengthen the mechanical properties of polysulfide elastomer inclusion of epoxy resin (epon828) as hard segment was studied. ft-ir spectroscopy and rheometry were used to verify the formation of epoxy-polysulfide copolymer.  results obtained from ...

polyethylene imide was synthesized from the reaction of high density polyethylene grafted maleic anhydride (pe-g-ma) and 1,4-diaminobutane in boiling xylene. the chemical compositions of the reaction products were examined by fourier transform infrared spectroscopy. different conditions and parameters like the effect of temperature, time, monomer concentration and oxygen on the extent of reacti...

Abstract The wall slip and flow behavior of alginate as well gelatin based hydrogels with respect to the impact these rheological wetting properties on extrusion‐based bioprinting (EBB) was investigated. Capillary rheometry printing tests indicate that is negligible at high stresses relevant for EBB, i.e., above yield stress. On contrary, rotational performed low shear revealed present much str...

Both industry and academia are rapidly developing processes, materials, projects to explore the potential of extrusion-layering additive manufacturing cementitious generally known as 3D concrete printing (3DCP). Because lack supportive formwork makes objects prone failure during printing, a key aspect remains so-called ‘buildability’, qualitative descriptor indicate resistance against such fail...

A planar two-dimensional computational analysis is presented to qualify traditional and fractal vane-in-cup geometries for accurate rheometry of simple viscoplastic fluids with without slip. Numerical simulations based on an adaptive augmented Lagrangian scheme are used study the flow field yield-stress within around vane tools N=3 24 arms a wide range Bingham numbers, B (i.e. ratio yield stres...