Investigation of solvent–solute interactions and film properties of perfluorinated sulfonic acid (PFSA) ionomers

One-pot synthesis of superabsorbent hybrid hydrogels based on methacrylamide gelatin and polyacrylamide. Effortless control of hydrogel properties through composition design

“…It is known that in such a situation the effective volume of the macromolecular chains increases, leading to larger hydrodynamic interactions with water molecules. 31 We assume that such an effect is proportional to the amount of PAA component in the bicomponent hydrogels, explaining the experimental observation that the sample P4 with the highest PAA content becomes a viscous gel impossible to become weighed after 168 h. On the other hand, the GELMA component is also responsible for the loss of stability of the hydrogels at pH 11. This presumption was based on the fragmentation of the GELMA hydrogel (T0 in Fig.…”

Evaluation of highly stable ultrahigh-molecular-weight partially hydrolyzed polyacrylamide for enhanced oil recovery

“…Although it was difficult to distinguish the C=O peak of carboxylic acid, a shoulder peak at around 1700 cm -1 clearly indicates a copolymer of acrylamide, acrylate and acrylic acid, similar to that in the work by Zeynali and Rabbii. 33 The C NMR and FTIR results indicate that synthesis of UHMW-HPAM from acrylic acid and acrylamide via radical polymerization was successful.…”

“…The results generally agree with studies on HPAM by Zurimendi et al 32 and Zeynali and Rabbii. 33 The C NMR spectrum of UHMW-HPAM exhibits peaks at around 181 ppm (ⓐ ), 43 ppm (ⓑ ), and 37 ppm Cumulative recoverd oil (mL) Intital saturated oil in rock (mL) ( Figure 1(a)). These were assigned to acrylamide (C 3 H 5 NO), acrylic acid (CH 2 =CHCO 2 H), and sodium acrylate (CH 2 = CHCO 2 Na), respectively, in accordance with peaks in a previous study.…”

“…It was determined by measuring the integral ratio of each carbonyl (C=O) peak from the amide and carboxyl groups. 8,33 The DH affects the properties of polymer flooding such as viscosity, solubility, salinity tolerance, and shear stability. 6,8,34 At larger DH, the polymer solution is more sensitive to salinity.…”

Voltammetric Determination of Captopril on a Glassy Carbon Electrode Modified with Copper Metal‐organic Framework

“…The viability of using Cu‐BTC immobilized with acrylamide/sodium acrylate copolymer as an electrochemical sensor without doping was initially attributed to the conductive characteristics of the copolymer . In solution, this copolymer has an anionic character and their carboxylate groups interacts with the copper terminals , accessible in the MOF facilitating the electron transfer process and consequently increased electrochemical response.…”