Eliminating or controlling lost circulation during drilling process is costly and time-consuming. Polymers play an important role in mud loss control for their viscosity due to high molecular weight. In this paper, three natural cellulosic polymers (carboxymethyl cellulose, guar gum potato starch) were investigated as material by measuring different filtration parameters such as; spurt loss, fluid permeability plugging tester value according the American Petroleum Institute (API) standard....

Gypsum plaster/silica composites prepared by dry blending (0.2-10 %) natural sand, silica fume or gel and subsequently hydrated. Their physical mechanical properties, including normal consistency, setting time, apparent porosity, bulk density compressive strength, were determined after hydration for 7- 28-days. The results indicated that adding different forms of lowered the increased porosity and, to some limited extent, strength composites. This improvement in properties can be attributed...

Mesoporous MCM-41 silica and rice husk composites were synthesised under hydrothermal conditions using cetyltrimethylammonium bromide (CTAB) as an organic template, aqueous ammonia solution (NH4OH) husk, the latter a source substrate for deposition of MCM-41. Both untreated carbonised husks used preparing at temperature 100–120°C 24–48 h. The or hybrid materials characterised by XRD SEM they found to be useful uptake perchlorate. These could separate perchlorate from solutions in column...

Abstract Heating gypsum below 100°c gives rise to limiting values of weight loss around that the hemihydrate formation whatever is time heating. Calcination at and above, on other hand, causes a continuous in as prolonged, leading γ‐anhydrite when adequate given. In most examined samples resistant state, with trace amounts residual water, reached towards end dehydration process. Such water driven off completely transformation temperature γ‐ β‐CaSO 4 .

In order to prepare moist healing wound dressings based on cotton gauze fabrics, the latter are carboxymethylated carboxyl contents of 72, 170, and 220meq/100g. contrast other two samples, first sample showed no gelling in phosphate buffered saline (PBS) at 37 ° C. The samples made Ca/Na forms 3% degree neutralization (% DN), 10/90, 20/80, 30/70), while that is left its Na form. To acquire them antibacterial activity, all padded 20/80 ethanol/water containing different concentrations...

Different generations of modified silica gel with polyamidoamine (PAMAM) dendrimers were synthesized.The adsorbents characterized using Fourier transform infrared, scanning electron microscopy energy dispersive X-ray spectroscopy thermal gravimetric analysis and porous structure analysis.The uptake behavior Si-6G PAMAM toward U(VI) at different experimental conditions pH, time, temperature concentration was studied batch mode.The maximum adsorption capacity 303.03 mg g -1 as described...

Radiation grafting by the mutual method of methacrylic acid/acrylonitrile (MAA/AN) onto Alhagi residues in presence dimethylformamide (DMF) as a solvent is discussed. The factors affecting radiation graft copolymerization were investigated. These included dose, co-monomer composition and concentration. grafted samples characterized using FT-IR spectroscopy scanning electron microscopy (SEM), well estimation their nitrogen carboxyl group contents. then amidoximated treatment with...

Abstract The synthesis of N‐acryloyloxy‐ and N‐methacryloyloxyphthalimides were accomplished in fair yield by reaction acryloyl methacryloyl chlorides with N‐hydroxyphthalimide the presence triethylamine. resulting monomers polymerized. ability prepared activated polymers to enter exchange reactions hydroxylated compounds amines was tested.

Abstract Copolymerization of N ‐methacryloyloxyphthalimide (NMP) with methyl acrylate (MA), methacrylate (MMA), and acrylonitrile (AN) was carried out in dimethylformamide using azobisisobutyronitrile (AIBN) as an initiator at 60°C. The estimation the copolymer compositions were by 1 H nuclear magnetic resonance (NMR) spectroscopy. monomer reactivity ratios for NMP‐MA, NMP‐MMA, NMP‐AN systems found to be r = 1.223, 2 0.208, 1.441, 0.704, 1.496 0.228, respectively, Kelen–Tüdős method. Also, Q...

The influence of 1.31PS organoclay content relative to PGV grade on the properties PVC compounds was analyzed.Dielectric (i.e.permittivity ' & dielectric loss " ) nanocomposites were investigated in frequency range 10 2 -10 5 Hz at room temperature  25 o C. In addition experimental data conductivity term  also detected.The initial results show that nanoparticles clay can improve electrical insulation by lowering "(at 2.5 phr) and (at 4 phr).The nano shows a significant resistivity...

Abstract N‐Acryloyloxyphthalimide was prepared by the reaction of acrylic acid with N‐hydroxyphthalimide in presence N,N′‐dicyclohexylcarbodiimide. The monomer reactivity ratios for copolymerization N‐acryloyloxyphthalimide methyl acrylate, methacrylate, and acrylonitrile, respectively, were estimated 1 H‐NMR spectroscopic data. Q ‐ e values calculated.

In our previous work N-phthalimidomethyl methacrylate (NPMMA) monomer was prepared through the reaction of N-hydroxymethyl phthalimide with methacrylic acid in presence N, N-dicyclohexylcarbodiimide (DCCI) as a condensing agent. Then new series copolymers containing imidazole have been synthesized NPMMA 1-vinylimidazole (VIM) benzoyl peroxide initiator. The copolymer composition determined by 1H NMR spectroscopy and values reactivity ratio (r1= 0.756, r2= 1.033, r1r2= 0.781) were calculated...