This paper presents the effects of various milling conditions on the tool wear and workpiece temperature when using ethylene-glycol-based TiO 2 nanofluid as the coolant for stainless steel AISI 304. A TiN coated carbide insert is used as the milling tool. A thermocouple was embedded into the workpiece to record the workpiece temperature during the end-milling process. It can be clearly seen that the temperature keeps on increasing after each experimental pass for three sets of experiments. The experiment conducted using the ethylene-glycol-based TiO 2 nanocoolant exhibits a much lower workpiece temperature compared to the experiment conducted using a normal commercial coolant. Milling with the ethylene-glycol-based TiO 2 nanocoolant reduced the wear on the edge of the insert compared to the normal commercial coolant. In conclusion, end-milling stainless steel AISI 304 using a TiN coated carbide insert and an ethylene-glycol-based TiO 2 nanocoolant exhibits superior results with regard to workpiece temperature and tool wear. The temperature was reduced by 30 percent when using the nanofluid

By exposure to ultraviolet and gamma radiation and by the usual methods of thermal polymerization, the stereospecific polymerization of methyl aryloxymethacrylates was carried out at different temperatures in several solvents. Triad tacticity values of the polymers obtained by free‐radical and ionic routes were computed from nuclear magnetic resonance spectral data. Results of this investigation support our earlier observation that, under the conditions used, heterotactic content is the maximum in most of these polymers, thereby justifying the high steric effect of the bulky and polar aryloxy side chain which offers equal isotactic and syndiotactic placements.

Surface roughness is a variable often used to describe the quality of ground surfaces as well as to evaluate the competitiveness of the overall grinding system. The subject of this paper is a grinding process performed on P20 tool steel by changing the grinding conditions, including the depth of cut, the grinding passes, the type of wheel, and the cutting fluid supply in the experiment. The main objective was to investigate the effect of ZnO nanofluid on the grinding surface finishing and wheel wear. The machined surface of selected specimens underwent SEM to assess the surface integrity. An artificial neural network was used to predict the surface roughness and recognize the trend of the surface roughness. The result showed the reduction of 47 % surface roughness value in grinding with ZnO nanofluid. The neural network made accurate predictions and could recognize the roughness trend.

SYNOPSISAbout 38% conversion of carbonyl groups into epoxy functions in the molecular chain of poly (N-vinyl pyrrolidone) using chloracetamide results in the decreased viscosity of the product. De-epoxidation of the epoxy groups introduced shows the most contributing factor towards decreased viscosity is epoxy function.In a previous study, we reported on the synthesis of some methyl aryloxymethacrylates, the polymers we obtained by different methods, and some characterization studies, such as an evaluation of MarkHouwink's constants, X-ray diffraction patterns of fibers, etc., performed on these polymers.' The present work shows the possibility of carrying out DarZen's glycidic ester condensation reaction across a polymeric carbonyl group. The use of Darzen's condensation reaction in the conversion of aldehydic and ketonic functions into epoxy function is well established in both aromatic and aliphatic compounds, including terpene ketones, by employing a host of condensing agents and a variety of condensing No reference in the literature is found, however, for the conversion of a polymeric carbonyl into an epoxy derivative. Also, polymers or copolymers having an epoxy linkage are made from monomers containing an epoxy group, which, in turn, is introduced into the precursor through Darzen's condensation, epichlorohydrin reaction, etc. It is, however, observed that commercial poly (N-vinyl pyrrolidone) , PVP, can undergo DarZen's glycidic ester condensation reaction under certain conditions. PVP finds extensive applications, especially as a water soluble polymer, and its condensation product from Darzen's reaction, which is soluble in water, is found to have a lower viscosity than PVP. In as much as viscosity reducers have

SYNOPSISA new monomer, N-succinimido (N) thiocarbonyl acrylamide is formed when succinic anhydride, thiourea, and acryloyl chloride are condensed in mole proportions at low temperatures. The monomer is polymerized and graft copolymerized onto poly (vinyl alcohol) using a potassium bromate-thiourea redox system. Acrylamide is also similarly grafted to poly( vinyl alcohol) using the same initiator system. Grafting efficiencies of the monomers are determined from the elemental analyses data of the graft copolymers. Thermal behavior of the polymers are derived from the DSC thermograms of the polymers. 0 1993