The effect of arm number and solution concentration on phase separation of thermosensitive poly(2-isopropyl-2-oxazoline) stars in aqueous solutions

Amirova, Alina; Golub, Olga V.; Kirila, Tatyana; Razina, A. B.; Теньковцев, А. В.; Филиппов, А. П.

doi:10.1007/s00396-016-3853-3

Cited by 21 publications

(15 citation statements)

References 48 publications

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“…It should be emphasized that all the experimental values discussed later were measured at steady-state conditions, i.e., when the parameters concerned became constant in time. Note that similar time dependences were observed for other poly(2-isopropyl-2-oxazoline) stars [12,14,15].…”

Section: Investigation Of Piprox 4 -S Star Behavior In Aqueous Solutionssupporting

confidence: 75%

“…These data allow us to assume that the individual star-shaped macromolecules of PiPrOx 4 -S or small aggregates (two or three macromolecules) are responsible for the fast mode. Note that radius <R h-f > for PiPrOx 4 -S is lower than <R h-f > = 3.6 nm for PiPrOx 4 -L [14]. This reflects the decrease of star-shaped molecule dimensions with arm shortening.…”

Section: Resultsmentioning

confidence: 87%

“…Therefore, the purpose of the present work was to analyze the influence of arm length and concentration on the characteristics of the aqueous solution of thermosensitive stars. In order to solve this problem, PiPrOx 4 -S (Scheme 1) with four short arms was investigated within wide concentration range and the obtained data were compared with the results for long-arm stars (PiPrOx 4 -L) [14].…”

Section: Partialmentioning

confidence: 99%

“…The degree of polymerization N arm = 9 of 2-isopropyl-2-oxazoline arms was calculated using M sD value, as well as the known molar masses of t-butyl-calix [4]arene (M = 952 g mol −1 ) and decamethylene spacers. Note that the data for PiPrOx 4 -S was compared to the results for PiPrOx 4 -L studied earlier [14]. PiPrOx 4 -L was obtained with the same calix [4]arene core in the same synthetic way, but was characterized by longer arms (N arm = 25).…”

Section: Experimental Section Synthesis and Characterization Of Pipromentioning

confidence: 99%

“…It should be noted that these results concern one, rather high, concentration c ≈ 0.016 g cm −3 . As we know, the solution behavior of poly(2-isopropyl-2-oxazoline) stars strongly depends on the concentration [11, 13,14], especially at c < 0.005 g cm −3 . Therefore, the purpose of the present work was to analyze the influence of arm length and concentration on the characteristics of the aqueous solution of thermosensitive stars.…”

Section: Partialmentioning

confidence: 99%

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Influence of arm length on aqueous solution behavior of thermosensitive poly(2-isopropyl-2-oxazoline) stars

et al. 2016

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Four-arm star-shaped poly(2-isopropyl-2-oxazoline) (PiPrOx 4 -S) with short arms was studied by turbidimetry and light scattering in aqueous solutions at concentrations ranging from 0.00024 to 0.0326 g cm −3 . The molar mass M of the sample investigated was 5700 g mol −1 . In order to reveal the influence of arm length on solution properties, the results obtained for PiPrOx 4 -S were compared with the characteristics of four-arm star PiPrOx 4 -L with long arms and M = 13,000 g mol −1 . Arm shortening leads to appearance of the new type of particles and growth of the aggregation number. Stronger concentration dependences of phase transition temperatures and double widening of this interval are observed for PiPrOx 4 -S as compared to long-arm star. It is shown that arm lengthening causes more remarkable changes in solution behavior than the variation of arm number.

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Section: Investigation Of Piprox 4 -S Star Behavior In Aqueous Solutionssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 87%

Section: Partialmentioning

confidence: 99%

Section: Experimental Section Synthesis and Characterization Of Pipromentioning

confidence: 99%

Section: Partialmentioning

confidence: 99%

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Influence of arm length on aqueous solution behavior of thermosensitive poly(2-isopropyl-2-oxazoline) stars

et al. 2016

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Star‐shaped Poly(2‐alkyl‐2‐oxazolines): Synthesis and Properties

Теньковцев

Amirova

Филиппов

2018

Temperature‐Responsive Polymers

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Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

Amirova

Rodchenko

Makhmudova

et al. 2016

Macromol. Chem. Phys.

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Star‐shaped poly(2‐isopropyl‐2‐oxazolines) with dramatically hydrophobic dendrimer core are synthesized using carbosilane dendrimers of first to third generations as macroinitiators. It is observed that half of the initiator functional groups are incorporated in polymerization process. The polymerization degree of polyoxazoline arms is about 25. Strong arm folding results in small molecule dimensions in both aqueous and organic solutions. Thermosensitive properties are studied for second generation‐based star solution with the concentration of 0.00095 g cm−3. Model linear poly(2‐isopropyl‐2‐oxazolines) are investigated for comparison. Carbosilane dendrimer core interaction leads to the formation of different types of aggregates at low temperatures. The temperatures of the beginning (T1 = 42–43 °C) and finishing (T2 = 50 °C) of phase separation are determined. It is shown that macromolecule compactization and aggregation take place even far from the phase transition interval and alternately prevail on heating.

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The effect of arm number and solution concentration on phase separation of thermosensitive poly(2-isopropyl-2-oxazoline) stars in aqueous solutions

Cited by 21 publications

References 48 publications

Influence of arm length on aqueous solution behavior of thermosensitive poly(2-isopropyl-2-oxazoline) stars

Influence of arm length on aqueous solution behavior of thermosensitive poly(2-isopropyl-2-oxazoline) stars

Star‐shaped Poly(2‐alkyl‐2‐oxazolines): Synthesis and Properties

Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers

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