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Journal articles on the topic 'Poly(2-oxazoline)'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 January 2023

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1

Tarabukina, Elena, Emil Fatullaev, Anna Krasova, Maria Sokolova, Mikhail Kurlykin, Igor Neelov, Andrey Tenkovtsev, and Alexander Filippov. "Thermoresponsive Molecular Brushes with a Rigid-Chain Aromatic Polyester Backbone and Poly-2-alkyl-2-oxazoline Side Chains." International Journal of Molecular Sciences 22, no. 22 (November 12, 2021): 12265. http://dx.doi.org/10.3390/ijms222212265.

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A new polycondensation aromatic rigid-chain polyester macroinitiator was synthesized and used to graft linear poly-2-ethyl-2-oxazoline as well as poly-2-isopropyl-2-oxazoline by cationic polymerization. The prepared copolymers and the macroinitiator were characterized by NMR, GPC, AFM, turbidimetry, static, and dynamic light scattering. The molar masses of the polyester main chain and the grafted copolymers with poly-2-ethyl-2-oxazoline and poly-2-isopropyl-2-oxazoline side chains were 26,500, 208,000, and 67,900, respectively. The molar masses of the side chains of poly-2-ethyl-2-oxazoline and poly-2-isopropyl-2-oxazoline and their grafting densities were 7400 and 3400 and 0.53 and 0.27, respectively. In chloroform, the copolymers conformation can be considered as a cylinder wormlike chain, the diameter of which depends on the side chain length. In water at low temperatures, the macromolecules of the poly-2-ethyl-2-oxazoline copolymer assume a wormlike conformation because their backbones are well shielded by side chains, whereas the copolymer with short side chains and low grafting density strongly aggregates, which was visualized by AFM. The phase separation temperatures of the copolymers were lower than those of linear analogs of the side chains and decreased with the concentration for both samples. The LCST were estimated to be around 45 °C for the poly-2-ethyl-2-oxazoline graft copolymer, and below 20 °C for the poly-2-isopropyl-2-oxazoline graft copolymer.

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2

Gieseler, Dan, and Rainer Jordan. "Poly(2-oxazoline) molecular brushes by grafting through of poly(2-oxazoline)methacrylates with aqueous ATRP." Polymer Chemistry 6, no. 25 (2015): 4678–89. http://dx.doi.org/10.1039/c5py00561b.

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3

Yang, Jinxian, Lianwei Li, Chunfeng Ma, and Xiaodong Ye. "Degradable polyurethane with poly(2-ethyl-2-oxazoline) brushes for protein resistance." RSC Advances 6, no. 74 (2016): 69930–38. http://dx.doi.org/10.1039/c6ra13663j.

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The effects of chain length and graft density of poly(2-ethyl-2-oxazoline) on the protein resistance of degradable polyurethane-graft-poly(2-ethyl-2-oxazoline) with PCL as the soft segment have been investigated.

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4

Hoogenboom, Richard, and Helmut Schlaad. "Bioinspired Poly(2-oxazoline)s." Polymers 3, no. 1 (February 11, 2011): 467–88. http://dx.doi.org/10.3390/polym3010467.

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5

Sedlacek, Ondrej, Victor R. de la Rosa, and Richard Hoogenboom. "Poly(2-oxazoline)-protein conjugates." European Polymer Journal 120 (November 2019): 109246. http://dx.doi.org/10.1016/j.eurpolymj.2019.109246.

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6

Delaittre, Guillaume. "Telechelic poly(2-oxazoline)s." European Polymer Journal 121 (December 2019): 109281. http://dx.doi.org/10.1016/j.eurpolymj.2019.109281.

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7

Chen, Chia-Hsiu, Yosuke Niko, and Gen-ichi Konishi. "Amphiphilic gels of solvatochromic fluorescent poly(2-oxazoline)s containing D–π–A pyrenes." RSC Advances 6, no. 49 (2016): 42962–70. http://dx.doi.org/10.1039/c6ra06251b.

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8

Trzebicka, Barbara, Neli Koseva, Violeta Mitova, and Andrzej Dworak. "Organization of poly(2-ethyl-2-oxazoline)-block-poly(2-phenyl-2-oxazoline) copolymers in water solution." Polymer 51, no. 12 (May 2010): 2486–93. http://dx.doi.org/10.1016/j.polymer.2010.03.043.

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9

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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10

Wang, X., X. Li, Y. Li, Y. Zhou, C. Fan, W. Li, S. Ma, et al. "Synthesis, characterization and biocompatibility of poly(2-ethyl-2-oxazoline)–poly(d,l-lactide)–poly(2-ethyl-2-oxazoline) hydrogels." Acta Biomaterialia 7, no. 12 (December 2011): 4149–59. http://dx.doi.org/10.1016/j.actbio.2011.07.011.

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11

de la Rosa, Victor R., Werner M. Nau, and Richard Hoogenboom. "Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions." Organic & Biomolecular Chemistry 13, no. 10 (2015): 3048–57. http://dx.doi.org/10.1039/c4ob02654c.

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A poly[(2-ethyl-2-oxazoline)-ran-(2-nonyl-2-oxazoline)] random copolymer was synthesized and its thermoresponsive behavior in aqueous solution modulated by the addition of different supramolecular host molecules.

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12

Sehlinger, Ansgar, Bart Verbraeken, Michael A. R. Meier, and Richard Hoogenboom. "Versatile side chain modification via isocyanide-based multicomponent reactions: tuning the LCST of poly(2-oxazoline)s." Polymer Chemistry 6, no. 20 (2015): 3828–36. http://dx.doi.org/10.1039/c5py00392j.

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Poly(2-oxazoline)s are receiving large current interest based on their potential use in biomedical applications. Here we report a novel, straightforward route towards functional poly(2-oxazoline)s by Passerini and Ugi reactions.

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13

Buruaga, Lorea, Alba Gonzalez, and Juan J. Iruin. "Electrospinning of poly (2-ethyl-2-oxazoline)." Journal of Materials Science 44, no. 12 (June 2009): 3186–91. http://dx.doi.org/10.1007/s10853-009-3424-9.

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14

Lübtow, Mrlik, Hahn, Altmann, Beudert, Lühmann, and Luxenhofer. "Temperature-Dependent Rheological and Viscoelastic Investigation of a Poly(2-methyl-2-oxazoline)-b-poly(2-iso-butyl-2-oxazoline)-b-poly(2-methyl-2-oxazoline)-Based Thermogelling Hydrogel." Journal of Functional Biomaterials 10, no. 3 (August 7, 2019): 36. http://dx.doi.org/10.3390/jfb10030036.

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The synthesis and characterization of an ABA triblock copolymer based on hydrophilic poly(2-methyl-2-oxazoline) (pMeOx) blocks A and a modestly hydrophobic poly(2-iso-butyl-2-oxazoline) (piBuOx) block B is described. Aqueous polymer solutions were prepared at different concentrations (1–20 wt %) and their thermogelling capability using visual observation was investigated at different temperatures ranging from 5 to 80 °C. As only a 20 wt % solution was found to undergo thermogelation, this concentration was investigated in more detail regarding its temperature-dependent viscoelastic profile utilizing various modes (strain or temperature sweep). The prepared hydrogels from this particular ABA triblock copolymer have interesting rheological and viscoelastic properties, such as reversible thermogelling and shear thinning, and may be used as bioink, which was supported by its very low cytotoxicity and initial printing experiments using the hydrogels. However, the soft character and low yield stress of the gels do not allow real 3D printing at this point.

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15

Zhang, Ning, Stephan Huber, Anita Schulz, Robert Luxenhofer, and Rainer Jordan. "Cylindrical Molecular Brushes of Poly(2-oxazoline)s from 2-Isopropenyl-2-oxazoline." Macromolecules 42, no. 6 (March 24, 2009): 2215–21. http://dx.doi.org/10.1021/ma802627y.

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16

Shan, Xiaoning, Maryam A. Moghul, Adrian C. Williams, and Vitaliy V. Khutoryanskiy. "Mutual Effects of Hydrogen Bonding and Polymer Hydrophobicity on Ibuprofen Crystal Inhibition in Solid Dispersions with Poly(N-vinyl pyrrolidone) and Poly(2-oxazolines)." Pharmaceutics 13, no. 5 (May 4, 2021): 659. http://dx.doi.org/10.3390/pharmaceutics13050659.

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Poly(N-vinyl pyrrolidone) (PVP), poly(2-methyl-2-oxazoline) (PMOZ), poly(2-ethyl-2-oxazoline) (PEOZ), poly(2-n-propyl-2-oxazoline) (PnPOZ), and poly(2-isopropyl-2-oxazoline) (PiPOZ) were used to prepare solid dispersions with ibuprofen (IB), a model poorly-water soluble drug. Dispersions, prepared by solvent evaporation, were investigated using powder X-ray diffractometry, differential scanning calorimetry, and FTIR spectroscopy; hydrogen bonds formed between IB and all polymers in solid dispersions. PMOZ, the most hydrophilic polymer, showed the poorest ability to reduce or inhibit the crystallinity of IB. In contrast, the more hydrophobic polymers PVP, PEOZ, PnPOZ, and PiPOZ provided greater but similar abilities to reduce IB crystallinity, despite the differing polymer hydrophobicity and that PiPOZ is semi-crystalline. These results indicate that crystallinity disruption is predominantly due to hydrogen bonding between the drug molecules and the polymer. However, carrier properties affected drug dissolution, where PnPOZ exhibited lower critical solution temperature that inhibited the release of IB, whereas drug release from other systems was consistent with the degree of ibuprofen crystallinity within the dispersions.

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17

Hoogenboom, Richard. "Poly(2-oxazoline)s and polypeptoids." European Polymer Journal 131 (May 2020): 109696. http://dx.doi.org/10.1016/j.eurpolymj.2020.109696.

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18

Bus, Tanja, Christoph Englert, Martin Reifarth, Philipp Borchers, Matthias Hartlieb, Antje Vollrath, Stephanie Hoeppener, Anja Traeger, and Ulrich S. Schubert. "3rd generation poly(ethylene imine)s for gene delivery." Journal of Materials Chemistry B 5, no. 6 (2017): 1258–74. http://dx.doi.org/10.1039/c6tb02592g.

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In this study, a series of high molar mass poly(2-oxazoline)-based copolymers was synthesized, introducing 2-ethyl-2-oxazoline, ethylene imine, and primary amine bearing monomer units representing a new generation of PEI.

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19

Legros, Camille, Marie-Claire De Pauw-Gillet, Kam Chiu Tam, Daniel Taton, and Sébastien Lecommandoux. "Crystallisation-driven self-assembly of poly(2-isopropyl-2-oxazoline)-block-poly(2-methyl-2-oxazoline) above the LCST." Soft Matter 11, no. 17 (2015): 3354–59. http://dx.doi.org/10.1039/c5sm00313j.

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20

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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21

Rudolph, Tobias, Adam Nunns, Almut M. Schwenke, and Felix H. Schacher. "Synthesis and self-assembly of poly(ferrocenyldimethylsilane)-block-poly(2-alkyl-2-oxazoline) block copolymers." Polymer Chemistry 6, no. 9 (2015): 1604–12. http://dx.doi.org/10.1039/c4py01512f.

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The synthesis and self-assembly of organometallic poly(ferrocenyldimethylsilane)-block-poly(2-alkyl-2-oxazoline) (PFDMS-b-POx) diblock copolymers of different weight fractions in the bulk and in solution is investigated.

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22

Glassner, Mathias, Samarendra Maji, Victor R. de la Rosa, Nane Vanparijs, Kanykei Ryskulova, Bruno G. De Geest, and Richard Hoogenboom. "Solvent-free mechanochemical synthesis of a bicyclononyne tosylate: a fast route towards bioorthogonal clickable poly(2-oxazoline)s." Polymer Chemistry 6, no. 48 (2015): 8354–59. http://dx.doi.org/10.1039/c5py01280e.

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23

Leiske, Meike N., Matthias Hartlieb, Fabian H. Sobotta, Renzo M. Paulus, Helmar Görls, Peter Bellstedt, and Ulrich S. Schubert. "Cationic ring-opening polymerization of protected oxazolidine imines resulting in gradient copolymers of poly(2-oxazoline) and poly(urea)." Polymer Chemistry 7, no. 30 (2016): 4924–36. http://dx.doi.org/10.1039/c6py00785f.

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24

Rivas, Bernabé L., Klaus Albert, Kurt E. Geckeler, and Ernst Bayer. "Hindered Rotation in Poly(N-acyl)iminoalkylenes - A 13C Nuclear Magnetic Resonance Study." Zeitschrift für Naturforschung B 50, no. 9 (September 1, 1995): 1404–11. http://dx.doi.org/10.1515/znb-1995-0918.

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AbstractPoly(N-acetyl)iminoethylene. poly(N-propionyl)iminoethylene and poly(N-acetyl)-2,2-dimethyliminoethylene were prepared by cationic polymerization in solution of 2-methyl- 2-oxazoline, 2-ethyl-2-oxazoline, and 2,4,4-trimethyl-2-oxazoline respectively. The 13C NMR spectra of the polymers obtained showed different sets of shifts for the carbon atoms of the backbone as well as for the N-acylimino side chain due to the restricted rotation of the Nacylimino group. The temperature dependence of the N-acylimino side chain signals showed a different coalescence behaviour depending on the substituents at both the main and the side chain.

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25

Rasolonjatovo, Bazoly, Jean-Pierre Gomez, William Même, Cristine Gonçalves, Cécile Huin, Véronique Bennevault-Celton, Tony Le Gall, et al. "Poly(2-methyl-2-oxazoline)-b-poly(tetrahydrofuran)-b-poly(2-methyl-2-oxazoline) Amphiphilic Triblock Copolymers: Synthesis, Physicochemical Characterizations, and Hydrosolubilizing Properties." Biomacromolecules 16, no. 3 (February 5, 2015): 748–56. http://dx.doi.org/10.1021/bm5016656.

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26

Caponi, Pier-Francesco, Xing-Ping Qiu, Filipe Vilela, Françoise M. Winnik, and Rein V. Ulijn. "Phosphatase/temperature responsive poly(2-isopropyl-2-oxazoline)." Polym. Chem. 2, no. 2 (2011): 306–8. http://dx.doi.org/10.1039/c0py00291g.

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27

Kobayashi, Shiro, Mureo Kaku, Sh?ji Sawada, and Takeo Saegusa. "Synthesis of poly(2-methyl-2-oxazoline) macromers." Polymer Bulletin 13, no. 5 (May 1985): 447–51. http://dx.doi.org/10.1007/bf01033343.

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28

Chistyakov, Evgeniy M., Sergey N. Filatov, Elena A. Sulyanova, and Vladimir V. Volkov. "Determination of the Degree of Crystallinity of Poly(2-methyl-2-oxazoline)." Polymers 13, no. 24 (December 13, 2021): 4356. http://dx.doi.org/10.3390/polym13244356.

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A new method for purification of 2-methyl-2-oxazoline using citric acid was developed and living cationic ring-opening polymerization of 2-methyl-2-oxazoline was carried out. Polymerization was conducted in acetonitrile using benzyl chloride—boron trifluoride etherate initiating system. According to DSC data, the temperature range of melting of the crystalline phase of the resulting polymer was 95–180 °C. According to small-angle X-ray scattering and wide-angle X-ray diffraction data, the degree of crystallinity of the polymer was 12%. Upon cooling of the polymer melt, the polymer became amorphous. Using thermogravimetric analysis, it was found that the thermal destruction of poly(2-methyl-2-oxazoline) started above 209 °C.

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29

Lambermont-Thijs, Hanneke M. L., Martin W. M. Fijten, Ulrich S. Schubert, and Richard Hoogenboom. "Star-shaped Poly(2-oxazoline)s by Dendrimer Endcapping." Australian Journal of Chemistry 64, no. 8 (2011): 1026. http://dx.doi.org/10.1071/ch11128.

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The synthesis of star-shaped poly(2-ethyl-2-oxazoline) is reported by direct end-capping of the living polymer chains with dendritic multiamines. The end-capping kinetics after addition of a first generation polypropylenimine dendrimer are discussed based on monitoring by size exclusion chromatography, revealing less efficient end-capping with larger poly(2-ethyl-2-oxazoline) chains and increasing dendrimer generation. In addition, it is demonstrated that the solution viscosity and cloud point temperature of the star-shaped polymers are much less affected by chain length compared with their linear analogues.

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30

Menezes, Rafael Natal Lima de, and Maria Isabel Felisberti. "Combining CROP and ATRP to synthesize pH-responsive poly(2-ethyl-2-oxazoline-b-4-vinylpyridine) block copolymers." Polymer Chemistry 12, no. 32 (2021): 4680–95. http://dx.doi.org/10.1039/d1py00730k.

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Herein, we present the synthesis and characterization of block copolymers based on the biocompatible and stealth polymer poly(2-ethyl-2-oxazoline) and the polydentate ligand and pH-responsive poly(4-vinylpyridine).

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31

Glassner, Mathias, Bart Verbraeken, Valentin Victor Jerca, Kristof Van Hecke, John Tsanaktsidis, and Richard Hoogenboom. "Poly(2-oxazoline)s with pendant cubane groups." Polymer Chemistry 9, no. 39 (2018): 4840–47. http://dx.doi.org/10.1039/c8py01037d.

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32

Kobayashi, Shiro, Hiroshi Uyama, and Yutaka Narita. "Synthesis of Poly(2-oxazoline) Ionene Polymer." Polymer Journal 22, no. 2 (February 1990): 175–78. http://dx.doi.org/10.1295/polymj.22.175.

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33

Schmidt, Martin, Livia K. Bast, Franziska Lanfer, Lena Richter, Elisabeth Hennes, Rana Seymen, Christian Krumm, and Joerg C. Tiller. "Poly(2-oxazoline)–Antibiotic Conjugates with Penicillins." Bioconjugate Chemistry 28, no. 9 (September 6, 2017): 2440–51. http://dx.doi.org/10.1021/acs.bioconjchem.7b00424.

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34

Verbraeken, Bart, Bryn D. Monnery, Kathleen Lava, and Richard Hoogenboom. "The chemistry of poly(2-oxazoline)s." European Polymer Journal 88 (March 2017): 451–69. http://dx.doi.org/10.1016/j.eurpolymj.2016.11.016.

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35

Hoogenboom, Richard. "50 years of poly(2-oxazoline)s." European Polymer Journal 88 (March 2017): 448–50. http://dx.doi.org/10.1016/j.eurpolymj.2017.01.014.

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36

Rossegger, Elisabeth, Franz Pirolt, Stephanie Hoeppener, Ulrich S. Schubert, Otto Glatter, and Frank Wiesbrock. "Crosslinkable/functionalizable poly(2-oxazoline)based micelles." European Polymer Journal 121 (December 2019): 109305. http://dx.doi.org/10.1016/j.eurpolymj.2019.109305.

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37

Luxenhofer, Robert, and Rainer Jordan. "Click Chemistry with Poly(2-oxazoline)s." Macromolecules 39, no. 10 (May 2006): 3509–16. http://dx.doi.org/10.1021/ma052515m.

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38

Haigh, Jodie N., Ya-mi Chuang, Brooke Farrugia, Richard Hoogenboom, Paul D. Dalton, and Tim R. Dargaville. "Hierarchically Structured Porous Poly(2-oxazoline) Hydrogels." Macromolecular Rapid Communications 37, no. 1 (October 16, 2015): 93–99. http://dx.doi.org/10.1002/marc.201500495.

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39

Kuepfert, Michael, Peiyuan Qu, Aaron E. Cohen, Caroline B. Hoyt, Christopher W. Jones, and Marcus Weck. "Reversible Photoswitching in Poly(2‐oxazoline) Nanoreactors." Chemistry – A European Journal 26, no. 51 (August 17, 2020): 11776–81. http://dx.doi.org/10.1002/chem.202000179.

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40

Luxenhofer, Robert, Yingchao Han, Anita Schulz, Jing Tong, Zhijian He, Alexander V. Kabanov, and Rainer Jordan. "Poly(2-oxazoline)s as Polymer Therapeutics." Macromolecular Rapid Communications 33, no. 19 (August 3, 2012): 1613–31. http://dx.doi.org/10.1002/marc.201200354.

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41

Hoogenboom, Richard. "Poly(2-oxazoline)s: Alive and Kicking." Macromolecular Chemistry and Physics 208, no. 1 (January 2, 2007): 18–25. http://dx.doi.org/10.1002/macp.200600558.

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42

Schoolaert, Ella, Ronald Merckx, Jana Becelaere, Melissa Everaerts, Joachim F. R. Van Guyse, Ondrej Sedlacek, Bruno G. De Geest, et al. "Immiscibility of Chemically Alike Amorphous Polymers: Phase Separation of Poly(2-ethyl-2-oxazoline) and Poly(2-n-propyl-2-oxazoline)." Macromolecules 53, no. 17 (August 24, 2020): 7590–600. http://dx.doi.org/10.1021/acs.macromol.0c00970.

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43

Zheng, Xiajun, Chong Zhang, Longchao Bai, Songtao Liu, Lin Tan, and Yanmei Wang. "Antifouling property of monothiol-terminated bottle-brush poly(methylacrylic acid)-graft-poly(2-methyl-2-oxazoline) copolymer on gold surfaces." Journal of Materials Chemistry B 3, no. 9 (2015): 1921–30. http://dx.doi.org/10.1039/c4tb01766h.

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A series of well-controlled bottle-brush poly(methylacrylic acid)-graft-poly(2-methyl-2-oxazoline) copolymers were grafted to gold surfaces through an in situ aminolysis reaction to reduce protein adsorption and platelet adhesion.

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44

Trachsel, Lucca, Nicolas Broguiere, Jan-Georg Rosenboom, Marcy Zenobi-Wong, and Edmondo M. Benetti. "Enzymatically crosslinked poly(2-alkyl-2-oxazoline) networks for 3D cell culture." Journal of Materials Chemistry B 6, no. 46 (2018): 7568–72. http://dx.doi.org/10.1039/c8tb02382d.

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45

Estabrook, Daniel A., Amanda F. Ennis, Rachael A. Day, and Ellen M. Sletten. "Controlling nanoemulsion surface chemistry with poly(2-oxazoline) amphiphiles." Chemical Science 10, no. 14 (2019): 3994–4003. http://dx.doi.org/10.1039/c8sc05735d.

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46

Sedlacek, Ondrej, Debaditya Bera, and Richard Hoogenboom. "Poly(2-amino-2-oxazoline)s: a new class of thermoresponsive polymers." Polymer Chemistry 10, no. 34 (2019): 4683–89. http://dx.doi.org/10.1039/c9py00943d.

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47

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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48

Xu, Kang, Xiaojun Liu, Leran Bu, Hena Zhang, Caihong Zhu, and Yuling Li. "Stimuli-Responsive Micelles with Detachable Poly(2-ethyl-2-oxazoline) Shell Based on Amphiphilic Polyurethane for Improved Intracellular Delivery of Doxorubicin." Polymers 12, no. 11 (November 10, 2020): 2642. http://dx.doi.org/10.3390/polym12112642.

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Polyurethanes (PUs) have various biomedical applications including controlled drug delivery. However, the incompletely release of drug at tumor sites limits the efficiency of these drug loaded polyurethane micelles. Here we report a novel polymer poly(2-ethyl-2-oxazoline)-SS-polyurethane-SS-poly(2-ethyl-2-oxazoline) triblock polyurethane (PEtOz-PU(PTMCSS)-PEtOz). The hydrophilic pH-responsive poly(2-ethyl-2-oxazoline) was used as an end-block to introduce pH responsiveness, and the hydrophobic PU middle-block was easily synthesized by the reaction of poly (trimethylene carbonate) diol containing disulfide bonds (PTMC-SS-PTMC diol) and bis (2-isocyanatoethyl) disulfide (CDI). PEtOz-PU(PTMCSS)-PEtOz could self-assemble to form micelles (176 nm). The drug release profile of PEtOz-PU(PTMCSS)-PEtOz micelles loaded with Doxorubicin (DOX) was studied in the presence of acetate buffer (10 mM, pH 5.0) and 10 mM dithiothreitol (DTT). The results showed that under this environment, DOX-loaded polyurethane micelles could release DOX faster and more thoroughly, about 97% of the DOX was released from the DOX-loaded PEtOz-PU(PTMCSS)-PEtOz micelle. In addition, fluorescent microscopy and cell viability assays validated that the DOX-loaded polyurethane micelle strongly inhibits the growth of C6 cells, suggesting their potential as a new nanomedicine against cancer.

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Hoogenboom, Richard, and Helmut Schlaad. "Thermoresponsive poly(2-oxazoline)s, polypeptoids, and polypeptides." Polymer Chemistry 8, no. 1 (2017): 24–40. http://dx.doi.org/10.1039/c6py01320a.

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Kopka, Bartosz, Bartłomiej Kost, Katarzyna Rajkowska, Andrzej Pawlak, Alina Kunicka-Styczyńska, Tadeusz Biela, and Malgorzata Basko. "A simple strategy for efficient preparation of networks based on poly(2-isopropenyl-2-oxazoline), poly(ethylene oxide), and selected biologically active compounds: Novel hydrogels with antibacterial properties." Soft Matter 17, no. 47 (2021): 10683–95. http://dx.doi.org/10.1039/d1sm01066b.

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Novel polymer networks composed of biocompatible, hydrophilic poly(2-isopropenyl-2-oxazoline), poly(ethylene oxide), and biologically active compounds (cinnamic acid, benzoic acid or eugenol) were developed for potential antimicrobial applications.

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