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Relevant bibliographies by topics / Poly (2-isopropyl-2-oxazolines)

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Academic literature on the topic 'Poly (2-isopropyl-2-oxazolines)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Poly (2-isopropyl-2-oxazolines)"

1

Kirila, Tatyana, Anna Smirnova, Vladimir Aseyev, Andrey Tenkovtsev, Heikki Tenhu, and Alexander Filippov. "Self-Organization in Dilute Aqueous Solutions of Thermoresponsive Star-Shaped Six-Arm Poly-2-Alkyl-2-Oxazines and Poly-2-Alkyl-2-Oxazolines." Polymers 13, no. 9 (April 29, 2021): 1429. http://dx.doi.org/10.3390/polym13091429.

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The behavior of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines in aqueous solutions on heating was studied by light scattering, turbidimetry and microcalorimetry. The core of stars was hexaaza [26] orthoparacyclophane and the arms were poly-2-ethyl-2-oxazine, poly-2-isopropyl-2-oxazine, poly-2-ethyl-2-oxazoline, and poly-2-isopropyl-2-oxazoline. The arm structure affects the properties of polymers already at low temperatures. Molecules and aggregates were present in solutions of poly-2-alkyl-2-oxazines, while aggregates of two types were observed in the case of poly-2-alkyl-2-oxazolines. On heating below the phase separation temperature, the characteristics of the investigated solutions did not depend practically on temperature. An increase in the dehydration degree of poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines led to the formation of intermolecular hydrogen bonds, and aggregation was the dominant process near the phase separation temperature. It was shown that the characteristics of the phase transition in solutions of the studied polymer stars are determined primarily by the arm structure, while the influence of the molar mass is not so significant. In comparison with literature data, the role of the hydrophobic core structure in the formation of the properties of star-shaped polymers was analyzed.

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2

Park, Joon-Sik, Yoshitsugu Akiyama, Françoise M. Winnik, and Kazunori Kataoka. "Versatile Synthesis of End-Functionalized Thermosensitive Poly(2-isopropyl-2-oxazolines)." Macromolecules 37, no. 18 (September 2004): 6786–92. http://dx.doi.org/10.1021/ma049677n.

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3

Kirila, Tatyana, Alina Amirova, Alexey Blokhin, Andrey Tenkovtsev, and Alexander Filippov. "Features of Solution Behavior of Polymer Stars with Arms of Poly-2-alkyl-2-oxazolines Copolymers Grafted to the Upper Rim of Calix[8]arene." Polymers 13, no. 15 (July 29, 2021): 2507. http://dx.doi.org/10.3390/polym13152507.

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Star-shaped polymers with arms of block and gradient copolymers of 2-ethyl- and 2-isopropyl-2-oxazolines grafted to the upper rim of calix[8]arene were synthesized by the “grafting from” method. The ratio of 2-ethyl- and 2-isopropyl-2-oxazoline units was 1:1. Molar masses and hydrodynamic characteristics were measured using molecular hydrodynamics and optics methods in 2-nitropropane. The arms of the synthesized stars were short and the star-shaped macromolecules were characterized by compact dimensions and heightened intramolecular density. The influence of the arm structure on the conformation of star molecules was not observed. At low temperatures, the aqueous solutions of the studied stars were not molecular dispersed but individual molecules prevailed. One phase transition was detected for all solutions. The phase separation temperatures decreased with a growth of the content of more hydrophobic 2-isopropyl-2-oxazoline units. It was shown that the way of arms grafting to the calix[8]arene core affects the behavior of aqueous solutions of star-shaped poly-2-alkyl-2-oxazoline copolymers. In the case of upper rim functionalization, the shape of calix[8]arene resembles a plate. Accordingly, the core is less shielded from the solvent and the phase separation temperatures are lower than those for star-shaped poly-2-alkyl-2-oxazolines with lower rim functionalization of the calix[8]arene.

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4

Blokhin, Aleksei N., Alla B. Razina, and Andrey V. Tenkovtsev. "Novel Amphiphilic Star-Shaped Poly(2-Oxazoline)s with Calix[4]Arene Branching Center." Key Engineering Materials 899 (September 8, 2021): 300–308. http://dx.doi.org/10.4028/www.scientific.net/kem.899.300.

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Novel amphiphlic four-arm star-shaped poly (2-alkyl-2-oxazoline) s with calix [4] arene core were synthesized using the “grafting from” approach. The chlorosulfonated calix [4] arene derivative was synthesized and successfully applied as a multifunctional initiator for the cationic ring-opening polymerization of 2-alkyl-2-oxazolines. Obtained star-shaped poly (2-alkyl-2-oxazoline) s were characterized by means of NMR, UV-Vis spectroscopy and gel-permeation chromatography. It was shown that star-shaped poly (2-isopropyl-2-oxazoline) perform thermosensitivity in aqueous solutions.

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5

Kirila, Tatyana, Anna Smirnova, Alla Razina, Andrey Tenkovtsev, and Alexander Filippov. "Influence of Salt on the Self-Organization in Solutions of Star-Shaped Poly-2-alkyl-2-oxazoline and Poly-2-alkyl-2-oxazine on Heating." Polymers 13, no. 7 (April 4, 2021): 1152. http://dx.doi.org/10.3390/polym13071152.

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The water–salt solutions of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines were studied by light scattering and turbidimetry. The core was hexaaza[26]orthoparacyclophane and the arms were poly-2-ethyl-2-oxazine, poly-2-isopropyl-2-oxazine, poly-2-ethyl-2-oxazoline, and poly-2-isopropyl-2-oxazoline. NaCl and N-methylpyridinium p-toluenesulfonate were used as salts. Their concentration varied from 0–0.154 M. On heating, a phase transition was observed in all studied solutions. It was found that the effect of salt on the thermosensitivity of the investigated stars depends on the structure of the salt and polymer and on the salt content in the solution. The phase separation temperature decreased with an increase in the hydrophobicity of the polymers, which is caused by both a growth of the side radical size and an elongation of the monomer unit. For NaCl solutions, the phase separation temperature monotonically decreased with growth of salt concentration. In solutions with methylpyridinium p-toluenesulfonate, the dependence of the phase separation temperature on the salt concentration was non-monotonic with minimum at salt concentration corresponding to one salt molecule per one arm of a polymer star. Poly-2-alkyl-2-oxazine and poly-2-alkyl-2-oxazoline stars with a hexaaza[26]orthoparacyclophane core are more sensitive to the presence of salt in solution than the similar stars with a calix[n]arene branching center.

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6

Ten’kovtsev, A. V., A. E. Trofimov, and L. I. Shcherbinskaya. "Thermoresponsive star-shaped poly(2-isopropyl-2-oxazolines) based on octa-tert-butylcalix[8]arene." Polymer Science Series B 54, no. 3-4 (April 2012): 142–48. http://dx.doi.org/10.1134/s1560090412030098.

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7

Diab, Charbel, Yoshitsugu Akiyama, Kazunori Kataoka, and Françoise M. Winnik. "Microcalorimetric Study of the Temperature-Induced Phase Separation in Aqueous Solutions of Poly(2-isopropyl-2-oxazolines)." Macromolecules 37, no. 7 (April 2004): 2556–62. http://dx.doi.org/10.1021/ma0358733.

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8

Amirova, Alina, Serafim Rodchenko, Zhanna Makhmudova, Georgij Cherkaev, Sergey Milenin, Elena Tatarinova, Mikhail Kurlykin, Andrey Tenkovtsev, and Alexander Filippov. "Synthesis, Characterization, and Investigation of Thermosensitive Star-Shaped Poly(2-isopropyl-2-oxazolines) Based on Carbosilane Dendrimers." Macromolecular Chemistry and Physics 218, no. 4 (December 27, 2016): 1600387. http://dx.doi.org/10.1002/macp.201600387.

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9

Amirova, Alina, Tatyana Kirila, Mikhail Kurlykin, Andrey Tenkovtsev, and Alexander Filippov. "Influence of Cross-Linking Degree on Hydrodynamic Behavior and Stimulus-Sensitivity of Derivatives of Branched Polyethyleneimine." Polymers 12, no. 5 (May 9, 2020): 1085. http://dx.doi.org/10.3390/polym12051085.

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Cross-linked derivatives of acylated branched polyethyleneimine containing 2-isopropyl-2-oxazoline units were investigated in chloroform and aqueous solutions using methods of molecular hydrodynamics, static and dynamic light scattering, and turbidity. The studied samples differed by the cross-linker content. The solubility of the polyethyleneimines studied worsened with the increasing mole fraction of the cross-linker. Cross-linked polyethyleneimines were characterized by small dimensions in comparison with linear analogs; the increase in the cross-linker content leads to a growth of intramolecular density. At low temperatures, the aqueous solutions of investigated samples were molecularly dispersed, and the large aggregates were formed due to the dehydration of oxazoline units and the formation of intermolecular hydrogen bonds. For the cross-linked polyethyleneimines, the phase separation temperatures were lower than that for linear and star-shaped poly-2-isopropyl-2-oxazolines. The low critical solution temperature of the solutions of studied polymers decreased with the increasing cross-linker mole fraction. The time of establishment of the constant characteristics of the studied solutions after the jump-like change in temperature reaches 3000 s, which is at least two times longer than for linear polymers.

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10

Nekrasova, T. N., T. D. Anan’eva, V. D. Pautov, A. B. Razina, M. P. Kurlykin, and A. V. Ten’kovtsev. "Photophysical and conformation properties of luminescent-labeled star poly-2-isopropyl-2-oxazolines based on octa-tert-butylcalix[8]arene in solution." Polymer Science, Series A 59, no. 3 (May 2017): 324–29. http://dx.doi.org/10.1134/s0965545x17030142.

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Dissertations / Theses on the topic "Poly (2-isopropyl-2-oxazolines)"

1

Diab, Charbel. "Microcalorimetric study of the temperature-induced phase separation in aqueous solutions of thermosensitive polymers." Thèse, 2004. http://hdl.handle.net/1866/16742.

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