Poly acrylamide-co-sodium methacrylate

In this experiment, crosslinked poly(acrylamide-co-sodium methacrylate) (0.5-5.0mol% sodium methacrylate) gel cylinders of different radii in the... 

Fig. 8, Examples of a least squares fit of a shrinking core model to measurements of moving ion exchange fronts which develop within the acidic form of poly(acrylamide-co-sodium methacrylate) gel cylinders of different radii when immersed in pH 12 NaOH solution. Legend All gels were made from a solution containing 1 mol % of solution methacrylate A = 1.8 mm radius B = 2.8 mm C = 4.2 mm D = 6.4 mm. Reprinted with permission from [127]. Copyright [1992] American Chemical Society...

To dearly distinguish between these two modes of solvent penetration of the gel, we immersed poly(acrylamide-co-sodium methacrylate) gels swollen with water and equilibrated with either pH 4.0 HQ or pH 9.2 NaOH solution into limited volumes of solutions of 10 wt % deuterium oxide (DzO) in water at the same pHs. By measuring the decline in density of the solution with time using a densitometer, we extracted the diffusion coefficient of D20 into the gel using a least squares curve fit of the exact solution for this diffusion problem to the data [121,149]. The curve fit in each case was excellent, and the diffusion coefficients obtained were 2.3 x 10 5cm2/s into the ionized pH 9.2 gel and 2.4 x 10 5 cm2/s into the nonionized pH 4.0 gel. These compare favorably with the self diffusion coefficient of D20, which is 2.6 x 10 5 cm2/s, since the presence of the polymer can be expected to reduce the diffusion coefficient about 10% in these cases [150], In short, these experiments show that individual solvent molecules can rapidly redistribute between the solution and the gel by a Fickian diffusion process with diffusion coefficients slightly less than in the free solution. 

Murthy, P. S. K. Mohan, Y. M. Sreeramulu, J. Raju, K. M. Semi-IPNs of starch and poly(acrylamide-co-sodium methacrylate) Preparation, swelling and diffusion characteristics evaluation. React. Eunct. Polym. 66 1482-1493 (2006). 

Liu, Z.Q., Yang, Z.P., Luo, Y.L., 2012c. Swelling, pH sensitivity, and mechanical properties of poly(acrylamide-co-sodium methacrylate) nanocomposite hydrogels impregnated with carboxyl-functionalized carbon nanotubes. Polymer Composite 33, 665—674. 

Nevertheless, if the oilfield can be preflushed by fresh water, satisfactory results can be obtained with hydrolyzed polyacrylamides. On the other hand, poly(acrylamide-co-sodium-2-sulfoethyl-methacrylate)... 

Fig. 21. Separation of cytochrome (peak 1), ribonuclease, (peak 2), carbonic anhydrase (peak 3), lysozyme (peak 4), and chymotrypsinogen (peak 5) by hydrophobic interaction chromatography on a molded poly(acrylamide-co-butylmethacrylate-co-N,AT,-methylenebisacry-lamide) monolithic column. (Reprinted with permission from [ 135]. Copyright 1998 Elsevier). Conditions column, 50 x8 mm i.d., 10% butyl methacrylate,mobile phase gradient from 1.5 to 0.1 mol/1 ammonium sulfate in 0.01 mol/l sodium phosphate buffer (pH 7) in 3 min, gradient time 3.3 min, flow rate 3 ml/min...

Tumoko and coworkers [485] showed that polymers based on acrylamide, methyl propane sulfonic acid and butyl methacrylate in conjunction with poly(2 methacryloyloxyethyl phosphorylcholine-co-butyl methacrylate) are capable of suppressing platelet adherence. Similar results [486] were found on poly(gamma benzyl 1 glutamate-co-leucine) neutralized with sodium. 

When the water structure in the hydrated polymers was examined using the differential scaiming calorimetric technique, it was found that a large amount of free water existed in the MPC polymers [poly(MPC-co-BMA) and poly(MPC-co-n-dodecyl methacrylate (DMA) with 30 unit mol% of MPC] compared with that in poly(HEMA), poly(aciylamide-co-BMA) (PAM), poly(sodium 2-methyl-2-acrylamide propane sulfonate-co-BMA) (PAMB), and poly(N-vinyl pyrrolidone-co-BMA) (PVB) °. 

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