{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T07:11:13Z","timestamp":1791270673708,"version":"4.1.0"},"reference-count":95,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2021,11,12]],"date-time":"2021-11-12T00:00:00Z","timestamp":1636675200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Russian ministry of Science and Highest Education","award":["14.W03.31.0022"],"award-info":[{"award-number":["14.W03.31.0022"]}]},{"DOI":"10.13039\/501100002261","name":"RFBR","doi-asserted-by":"publisher","award":["(Fatullaev)  20-33-90292 and 20-53-12036"],"award-info":[{"award-number":["(Fatullaev)  20-33-90292 and 20-53-12036"]}],"id":[{"id":"10.13039\/501100002261","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>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 \u00b0C for the poly-2-ethyl-2-oxazoline graft copolymer, and below 20 \u00b0C for the poly-2-isopropyl-2-oxazoline graft copolymer.<\/jats:p>","DOI":"10.3390\/ijms222212265","type":"journal-article","created":{"date-parts":[[2021,11,14]],"date-time":"2021-11-14T20:48:36Z","timestamp":1636922916000},"page":"12265","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Thermoresponsive Molecular Brushes with a Rigid-Chain Aromatic Polyester Backbone and Poly-2-alkyl-2-oxazoline Side Chains"],"prefix":"10.3390","volume":"22","author":[{"given":"Elena","family":"Tarabukina","sequence":"first","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emil","family":"Fatullaev","sequence":"additional","affiliation":[{"name":"St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University), 197101 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna","family":"Krasova","sequence":"additional","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8183-8988","authenticated-orcid":false,"given":"Maria","family":"Sokolova","sequence":"additional","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4942-3026","authenticated-orcid":false,"given":"Mikhail","family":"Kurlykin","sequence":"additional","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5930-9892","authenticated-orcid":false,"given":"Igor","family":"Neelov","sequence":"additional","affiliation":[{"name":"St. Petersburg National Research University of Information Technologies, Mechanics and Optics (ITMO University), 197101 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrey","family":"Tenkovtsev","sequence":"additional","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander","family":"Filippov","sequence":"additional","affiliation":[{"name":"Institute of Macromolecular Compounds, Russian Academy of Sciences, 199004 Saint Petersburg, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,11,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"947","DOI":"10.1063\/1.1682040","article-title":"Polypeptide liquid crystals: Magnetic susceptibility, twist elastic constant, rotation viscosity coefficient, and poly-\u03b3-benzyl-L-glutamate side chain conformation","volume":"61","author":"Hines","year":"1974","journal-title":"J. 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