Recent progress in the application of pH-responsive polymers in separation science

Microwave plasma discharge-assisted surface modification of PVA films: coatings and food packaging

“…Plasma processing is the most environmentally friendly procedure. It does not require chemical materials, and it is a low-temperature, low-cost, non-toxic, and effective approach to surface modification since it only affects the surface properties of the polymer without affecting the bulk properties [4][5][6][7]. Plasma treatment of polymeric materials is a common method for introducing polar groups or increasing surface roughness to improve surface properties such as wettability, biocompatibility, adhesion, dyeing and printing [8,9].…”

CO2-responsive gels

“…4 These materials find utility in a wide range of current and emerging applications [4][5][6] such as catalysis, 7 controlled drug delivery, [8][9][10] artificial muscles, 2,[11][12][13] and sensors. [14][15][16] Stimuli that have been explored include light, [17][18][19] pH, [20][21][22] redox, [23][24][25] temperature, [26][27][28] electric current, [29][30][31] magnetic field, 32 mechanical activation, [33][34][35] ultrasonication, [36][37][38] biological factors, [39][40][41] and various gases, 42,43 e.g., 1 O 2 , 44 O 2 , 45 O 2 /N 2 , 46,47 and O 2 /CO 2 . 48,49 This review focuses on...…”

Binodal Curves and Tie-Line Compositions for a Poly(ethylene glycol) 6000 + Lithium Citrate + Water Aqueous Two-Phase System and the Partitioning of Salbutamol Drug at T = 288.15–318.15 K

“…The effect of pH on the ATPSs of pH-sensitive polymers was recently reviewed by Musarurwa and Tavengwa. 44 The phase behavior of ATPSs composed of pH-sensitive polymers is definitely influenced by the pH, and the polymers can be recovered easily by changing the pH of the solution. 45 Extensive studies also revealed that the two-phase formation tendency of the polymer/salt/water ATPSs usually increases by elevating the temperature.…”

“…Furthermore, some physical factors, other than the chemical structure of the polymer and salt, such as the molecular mass of the polymer, temperature, pH, and ionic strength of the solution can affect the formation of the ATPS and the partitioning of the chemical or biological materials in the designed ATPS. , In the previous work, the effect of the molecular mass of PEG on the phase equilibrium and partitioning of the salbutamol drug was studied by our group for the ATPSs composed of PEGs with the molecular mass of 1000, 1500, 2000, 4000, and 6000 + lithium citrate + water at the temperature of T = 298.15 K. It was found that as the molecular mass of the PEG was increased, the extension of the two-phase equilibrium area was also expanded. The effect of pH on the ATPSs of pH-sensitive polymers was recently reviewed by Musarurwa and Tavengwa . The phase behavior of ATPSs composed of pH-sensitive polymers is definitely influenced by the pH, and the polymers can be recovered easily by changing the pH of the solution .…”