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Amphiphilic Molecular Brushes with Regular Polydimethylsiloxane Backbone and Poly-2-isopropyl-2-oxazoline Side Chains. 3. Influence of Grafting Density on Behavior in Organic and Aqueous Solutions.
| Content Provider | Europe PMC |
|---|---|
| Author | Rodchenko, Serafim Kurlykin, Mikhail Tenkovtsev, Andrey Milenin, Sergey Sokolova, Maria Yakimansky, Alexander Filippov, Alexander |
| Editor | Pispas, Asterios (Stergios) |
| Copyright Year | 2022 |
| Abstract | Regular and irregular molecular brushes with polydimethylsiloxane backbone and poly-2-isopropyl-2-oxazoline side chains have been synthesized. Prepared samples differed strongly in the side chain grafting density, namely, in the ratio of the lengths of spacer between the grafting points and the side chains. The hydrodynamic properties and molecular conformation of the synthesized grafted copolymers and their behavior in aqueous solutions on heating were studied by the methods of molecular hydrodynamics and optics. It was found that the regularity and the grafting density do not affect the molecular shape of the studied samples of molecular brushes in the selective solvent. On the contrary, the grafting density is one of the most important factors determining the thermoresponsivity of grafted copolymers. It was shown that in analyzing self-organization and LCST values in aqueous solutions of poly-2-isopropyl-2-oxazolines with complex architecture, many factors should be considered. First is the molar fraction of the hydrophobic fragment and the intramolecular density. It was found that molar mass is not a factor that greatly affects the phase transition temperature of poly-2-isopropyl-2-oxazolines solutions at a passage from one molecular architecture to another. |
| Journal | Polymers |
| Volume Number | 14 |
| PubMed Central reference number | PMC9740392 |
| Issue Number | 23 |
| PubMed reference number | 36501510 |
| e-ISSN | 20734360 |
| DOI | 10.3390/polym14235118 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-11-24 |
| Access Restriction | Open |
| Rights License | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2022 by the authors. |
| Subject Keyword | poly-2-isopropyl-2-oxazoline polydimethylsiloxane molecular brushes thermosensitivity light scattering turbidimetry compaction aggregation LCST |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Polymers and Plastics |
