Self-organization in aqueous solutions of thermosensitive statistical copolymers based on N-(dimethylamino)ethyl methacrylate

Simonova, Maria; Khayrullin, Andrey R.; Turina, Valerija O.; Kamorina, Sofia I.; Каморин, Д. М.; Sadikov, A. Yu.; Филиппов, А. П.

doi:10.1080/1023666x.2019.1649026

Cited by 3 publications

(5 citation statements)

References 27 publications

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“…The radii of aggregates in aqueous solutions of pPEM and pEPM increase on heating. Similar behavior was observed earlier for thermo-and pH-responsive polymers with different architecture (linear, copolymers, and brushes) [22,23,32].…”

Section: Resultssupporting

confidence: 87%

“…This influence is also manifested in the analysis of the dependence of the phase separation temperatures on the polymer concentration and the medium acidity. In water solution, the dependencies of T1 and T2 on the concentration (Figure 12) had a character typical for thermoresponsive polymers in the dilute regime [22,23,32]; In addition to the turbidimetry, the solutions of pEPM and pPEM at concentration c = 0.005 g•cm −3 were investigated by SLS and DLS. The hydrodynamic characteristics of molecular brush aggregates and the temperatures of onset T 1 and finishing T 2 of the phase separation were determined.…”

Section: Resultsmentioning

confidence: 99%

Section: Polymersmentioning

confidence: 94%

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The Solution Properties of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol) and Oligo(propylene glycol) Side Chains

et al. 2022

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The properties of polymer brushes based on three macromonomers were investigated in aqueous and organic solutions. Methacrylic monomers with different compositions of the oligo(oxyalkylene) substituents and arrangements of the oligo(ethylene glycol) and oligo(propylene glycol) blocks were used for the synthesis of polymers. There were methoxy [oligo(ethylene glycol)10.3-block-oligo(propylene glycol)4.7] methacrylate, methoxy [oligo(propylene glycol)8.3-block-oligo(ethylene glycol)6.6] methacrylate, and methoxy oligo(propylene glycol)4.2 methacrylate. Molecular brushes were investigated by the methods of molecular hydrodynamics and optics in dilute solutions in acetonitrile, chloroform, and water. The peculiarities of behavior of poly[oligo(oxyalkylene) methacrylates] in aqueous solutions and water-toluene systems have been found; in particular, the solubility of the polymers in water and organic solvents, the polymers equilibrium distribution between the phases, and the surface activity in the water-toluene system have been established. The thermo-responsibility in aqueous solutions and values of a critical concentration of micelle formation were shown. Depending on the arrangement of blocks in the side chains of molecular brushes, they are characterized by different intramolecular density.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Polymersmentioning

confidence: 94%

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The Solution Properties of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol) and Oligo(propylene glycol) Side Chains

et al. 2022

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“…This influence is also manifested in the analysis of the dependence of the phase separation temperatures on the polymer concentration and the medium acidity. At a given value of pH, the dependences of T1 and T2 on the concentration had a character typical for thermoresponsive polymers in the dilute regime [33][34][35][36]; namely, the T1 and T2 values grew and the phase separation interval broadened with dilution (Figure 6). It is clearly seen that in the investigated concentration interval the temperature at the onset of phase separation for PDEAPMA-R solution is higher than T1 for PDEAPMA-C. On the other hand, the rate of decrease in T1 with concentration increases for PDEAPMA-C more than it does for PDEAPMA-R. Consequently, it can be assumed that a lower critical solution temperature (LCST) for the investigated samples will be close.…”

Section: Concentration and Ph Dependences Of The Characteristics Of P...mentioning

confidence: 97%

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

et al. 2022

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Thermo- and pH-responsive poly(N-[3-(diethylamino)propyl]methacrylamide)s were synthesized by free radical polymerization and RAFT polymerization. The molar masses of the samples were 33,000–35,000 g∙mol−1. Investigations of the dilute solutions showed that the prepared samples were flexible chain polymers. The behavior of the synthesized polymers in the buffer solutions was analyzed by turbidity and light scattering at a pH range of 7–13 and a concentration range of 0.0002–0.008 g·cm−3. When the concentrated solutions were at a low temperature, there were macromolecules and aggregates, which were formed due to the interaction of hydrophobic units. For the investigated samples, the lower critical solution temperatures were equal. The phase separation temperatures decreased as pH increased. The influence of polydispersity index on the characteristics of the samples in the solutions was analyzed. The radii of molecules of poly(N-[3-(diethylamino)propyl]methacrylamide) obtained by RAFT polymerization at this temperature at the onset and end of the phase separation interval were lower than ones for samples synthesized by conventional free radical polymerization.

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“…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.…”

Section: Resultsmentioning

confidence: 88%

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

et al. 2021

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Polymethacrylic molecular brushes with oligo(ethylene glycol)-block-oligo(propylene glycol) side chains were investigated by static and dynamic light scattering and viscometry. The solvents used were acetonitrile, tetrahydrofuran, chloroform, and water. The grafted copolymers were molecularly dispersed and dissolved in tetrahydrofuran and acetonitrile. In these solvents, the molar masses of copolymers were determined. In thermodynamically good solvents, namely tetrahydrofuran and acetonitrile, investigated copolymers have a high intramolecular density and the shape of their molecules resembles a star-shaped macromolecule. In chloroform and water, the micelle-like aggregates were formed. Critical micelle concentrations decreased with the lengthening of the hydrophobic block. Molecular brushes demonstrated thermosensitive behavior in aqueous solutions. The phase separation temperatures reduced with an increase in the content of the oligo(propylene glycol) block.

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Self-organization in aqueous solutions of thermosensitive statistical copolymers based on N-(dimethylamino)ethyl methacrylate

Cited by 3 publications

References 27 publications

The Solution Properties of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol) and Oligo(propylene glycol) Side Chains

The Solution Properties of Polymethacrylate Molecular Brushes with Oligo(ethylene glycol) and Oligo(propylene glycol) Side Chains

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

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

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