Composites of silver particles of diameters in the range 16.4–33.3 nm and polyacrylamide were prepared by a chemical method. Positron lifetime and Doppler broadening measurements of these samples were carried out. The positron lifetime spectra of all the samples could be decomposed into three components having lifetimes around 200, 500, and 1800 ps. These are believed to arise due to vacancy cl...

Polyacrylamide (HPAM) and other traditional polymers have poor temperature resistance salinity tolerance do not meet the needs of high-temperature high-salinity reservoirs. In this study, a new temperature-resistant salinity-tolerant polymer QJ75-39 was synthesized using acrylamide (AM) as hydrophilic monomer, 1-acrylamide-2-methylpropanesulfonic acid (AMPS) N-vinylpyrrolidone (NVP) functional ...

Chemical recovery techniques have always been considered as one of the efficient secondary and tertiary methods to enhance oil factor. Regarding diversity reservoir heterogeneity rock properties for each field, various chemical agents were taken into consideration provide a feasible process that has best agreement with characterization. The objective this paper is investigate considerable influ...

The stability mechanism and thermal properties of the system alumina-anionic polyacrylamide (PAM) was studied. The polymer's adsorption properties in dependence on the following parameters solution pH (in the range 3-9), temperature (in the range 15-35 °C), and carboxyl groups' content in the PAM chains (in the range 5-30 %) were examined. The turbidimetry method was applied for determination o...

Supplementary cementitious materials were incorporated into hydrogel-based internal curing agents to improve the hydration, microstructure, and ultimately strength of internally cured high-performance cement paste. Polyacrylamide composite hydrogel particles containing amorphous silica – either fume or nanosilica two different polymer network crosslink densities synthesized The presence low den...

Drilling waste is a problem that affects the environment, society, and health. However, rheological additive in drilling fluid source of generation waste. Hence, suitable became concern bored pile construction. Conventional bentonite has been replaced by usage polymer operations, this due to operational, environmental, economic aspects. Unlike bentonite, polyacrylamide (PAM) high molecular weig...

Rapid advances are taking place to develop hydrogels of high stretchability and toughness, but fatigue fracture has not been studied for any hydrogels. This negligence hinders the development of hydrogels and their applications. Herewe initiate a study of fatigue fracture of hydrogels.We choose polyacrylamide hydrogel as a model material. To place fatigue fracture in context, we apply monotonic...

Diffusion of aqueous sodium dodecyl sulfate (SDS) across cross-linked polyacrylamide hydrogel membranes has been studied by electrical conductivity measurements. Initial rapid sorption of SDS (as unimer) into the membranes is observed. The effect of SDS concentration, and of cross-linker fraction on the degree of swelling of the gels is studied and associated with binding of the surfactant to t...

2014 Photon correlation spectroscopy measurements are reported of the collective motion diffusion coefficient Dc and the longitudinal elastic modulus Egel of polyacrylamide gels in the poor solvent region using a water : methanol (3 : 1 by volume) mixture as solvent. It is shown that the presence of cross-links hinders the movement of polymer self-entanglements, which are characteristic of 03B8...

Abstract Polymer nanohybrids have displayed great potential in remobilizing oil droplets through porous media. This research aims at providing some insights into how the hydrolyzed polyacrylamide (HPAM) polymer and Al 2 O 3 nanoparticles’ (NPs) hybrid can push crude toward producers. An understanding of what viscosity is when flowing rocks was acquired by rheological tests. Using Du Noüy ring m...