Self-Organization Processes in Poly(N-[2-(diethylamino)ethyl]acrylamide) Buffer Solutions with Change in Concentration and pH of a Medium

The Influence of Synthesis Method on Characteristics of Buffer and Organic Solutions of Thermo- and pH-Responsive Poly(N-[3-(diethylamino)propyl]methacrylamide)s

“…The worsening of solubility with an increase in the medium basicity is manifested in the increase in the aggregate size at high pH. It is notable that the investigated PDEAPMA samples were more hydrophobic in comparison with poly[N- (2-(diethylamino)ethyl]acrylamide) [14], since the side chain of PDEAPMAs contains one more CH 2 group.…”

“…The aqueous and buffer solutions of the PDEAPMA samples were investigated by the methods of static (SLS) and dynamic (DLS) light scattering and turbidimetry using the Photocor Complex described above, which is also equipped with the Photocor-PD detection device for measuring the transmitted light intensity. (This experimental procedure has been described in detail before [14].) The solution temperature T was changed discretely with the step ranging from 1.0 to 5.0 • C. The temperature was regulated with the precision of 0.1 • C. The T values changed in the range of 15 to 79 • C. The buffers (Hanna Instruments, Woonsocket, RI, USA) with pH = 7.00, 9.18, 10.01, and 13.00 were used.…”

“…However, it is known that an increase in the hydrophobicity of the initial amine-containing acrylamide (e.g., through the introduction of the second alkyl substituent in the amide group or the replacement of methyl substituents by ethyl ones in the amino group) results in a thermoand pH-responsive polymer [11][12][13]. At the present time, approaches are being developed to obtain not only homopolymers of dialkylaminoalkyl(meth)acrylamides [11,12,14] but also their stimuli-sensitive copolymers [12,13].…”

“…The solution properties of polyacrylamides depend on the length of alkyl groups in a monomer unit [15], molar mass M w , and environmental conditions such as temperature T, pH, and concentration c [16,17]. Investigation of thermo-and pH-responsive poly[N- (2-(diethylamino)ethyl] acrylamide) (PDEAEA) has shown that at pH ≥ 7 a structural phase transition is observed in aqueous solutions of PDEAEA with a temperature growth [14]. The phase separation temperatures increase with dilution and decrease in pH.…”

Conformation, Self-Organization and Thermoresponsibility of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol)-block-oligo(propylene glycol) Side Chains

“…Figure 5 shows the temperature dependences of the relative optical transmission I */ I * 21 for the studied solutions. The observed behavior is typical for thermoresponsive polymers [ 43 , 44 , 45 , 46 , 47 , 48 ]. The temperatures of the onset T 1 and the finishing T 2 of the phase separation were defined as the beginning of the decrease in I */ I * 21 and as reaching its minimum value, respectively.…”