kinetics of polyacrylamide in science in Romania

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investigation of the thermal decomposition kinetics of ...

Investigation of the thermal decomposition kinetics of ...

The polymerizations exhibited first-order kinetics with respect to monomer and initiator concentrations, as expected for ATRP. These results set the stage for further detailed understanding of kinetics and mechanisms in ATRP reactions using ACOMP, where

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swelling characterization and drug delivery kinetics of ...

Swelling characterization and drug delivery kinetics of ...

When the swelling kinetics corresponds to a second order kinetics, Equation (4) is a linear relationship, and H∞ and k corresponds to the slope and intercept of the line, respectively [31]. The results obtained in this study agree with this behavior. Table 1 sum-k)

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adsorption kinetics of polyacrylamide-based polyelectrolyte ...

Adsorption kinetics of polyacrylamide-based polyelectrolyte ...

Adsorption and Kinetic Studies of Polyacrylamide (PAA) Hydrogels for Efficient Removal of Methylene Blue (MB) in Aqueous Media Umarfarooq A. Halyal 1,2, Sukhvinder Pal 1, Varun Kumar Sharma 1, Rakhi Tyagi 3, Mohd Yusuf 1,* 1 Department of Natural

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synthesis and drug release kinetics of ciprofloxacin from ...

Synthesis and drug release kinetics of ciprofloxacin from ...

Polymerization kinetics of polyacrylamide gels, cross‐linked with the following: N,N′‐methylenebisacrylamide (Bis), N,N′‐bisacrylylcystamine (BAC), N,N′‐ diallyltartardiamide (DATD), N,N′(1,2‐dihydroxyethylene) bisacrylamide (DHEBA) and ethylene diacrylate (EDA), have been studied. The gels are polymerized directly in a spectrophotometer quartz cuvette and the kinetics ...

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on the kinetics of polyacrylamide alkaline hydrolysis ...

On the Kinetics of Polyacrylamide Alkaline Hydrolysis ...

The temperature at which polyacrylamide gels are polymerized strongly affects the structure and physical properties of this matrix. The suggested temperature of 0–4 °C has been found to produce highly turbid, highly porous and unelastic gels. At temperature of 25 °C of higher, the gels became progressively transparent, less porous and more elastic. This phenomenon is strongly pronounced in ...

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swelling characterization and drug delivery kinetics of poly ...

Swelling characterization and drug delivery kinetics of poly ...

specific pH, temperature, electric field, light, pres-sure or specific molecule [6–12]. Several researchers have studied the swelling of pH-sensitive hydrogels and the influence of this parameter in chemical, biological and physiological systems [13]. Hydro-gels

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non-isothermal decomposition kinetics of commercial polyacry ...

Non-isothermal decomposition kinetics of commercial polyacry ...

Figure 1 shows the infrared spectrum for polyacrylamide, where the corresponding signals can be observed: to the OH group, at 3420 cm -1 , at 3200 cm -1 for the NH bond, at 2930 cm -1 for the CH ...

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crosslinking kinetics in polyacrylamide networks - sciencedi ...

Crosslinking kinetics in polyacrylamide networks - ScienceDi ...

There are several pathways through which a polymer can degrade such as thermal, photoinduced, biological, chemical and mechanical. The thermal degradation process of polymers is widely studied because of both academic and industrial interest. Here we have investigated the kinetics of thermal degradation and structural modification of polyacrylamide ultrathin films as a result of heat treatment ...

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effect of cationic polyacrylamide on precipitated calcium ...

Effect of cationic polyacrylamide on precipitated calcium ...

Modeling of Polyacrylamide Hydrogel Synthesis Catarina Gomes 1 , Rolando C.S. Dias 1, * and Mário Rui P.F.N. Costa 2 1 LSRE and Centro de Investigação de Montanha (CIMO), Instituto Politécnico ...

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What are the kinetic parameters for the thermal decomposition of polyacrylamide?

In this study, the kinetic parameters for the thermal decomposition of polyacrylamide are established with the use of a dynamic TG technique. Kinetic parameters which involve activation energy, reaction order and pre-exponential factor are found to be 157.48 ± 1.66 kJ mol −1 ,1 and 6.46 ×10 11 respectively.

Does polyacrylamide affect adsorption?

The stability of the adsorption is determined by the type of clay minerals. This study investigates the behavior of polyacrylamide on the surface of key clay minerals found in geological formations, focusing on adsorption, retention, desorption, and plugging effects.

Does polyacrylamide adsorb on clay?

This study investigates the behavior of polyacrylamide on the surface of key clay minerals found in geological formations, focusing on adsorption, retention, desorption, and plugging effects. To this end, experiments were conducted to observe polymer adsorption on various minerals and rock surfaces.

How does polyacrylamide adsorption affect kaolinite and quartz?

The adsorption of polyacrylamide onto kaolinite and quartz is mainly influenced by the interaction between the amide group (NH2) of polyacrylamide and the clay mineral surfaces. Interestingly, the orientation of oxygen atoms in the polyacrylamide molecular chain is observed to be opposite to the direction of the clay minerals after adsorption.

What is the strength of adsorption between rock and polyacrylamide?

The strength of adsorption between the rock and polyacrylamide is influenced by the core's mineral composition. At the same injection rate, montmorillonite shows higher adsorption capacity compared to quartz, while quartz exhibits greater retention than illite and kaolinite.

Does shearing increase adsorption capacity of polyacrylamide?

The effect of shearing is more pronounced in polyacrylamide with higher initial molecular weights, as the degree of molecular chain damage is more significant, leading to a more substantial increase in adsorption capacity after shearing. 3.3. Competitive adsorption mechanism of polymer on rock surfaces

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