Thermosensitive star-shaped poly-2-ethyl-2-oxazine. Synthesis, structure characterization, conformation, and self-organization in aqueous solutions
| Autor: | Alexander P. Filippov, A.S. Filippov, Anna Smirnova, Tatyana Kirila, A. B. Razina, Andrey V. Tenkovtsev |
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| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Molar mass Aqueous solution Polymers and Plastics Organic Chemistry General Physics and Astronomy 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Branching (polymer chemistry) 01 natural sciences Lower critical solution temperature Light scattering 0104 chemical sciences chemistry Materials Chemistry Physical chemistry Molecule 0210 nano-technology Macromolecule |
| Zdroj: | European Polymer Journal. 120:109215 |
| ISSN: | 0014-3057 |
| DOI: | 10.1016/j.eurpolymj.2019.109215 |
| Popis: | Star-shaped four-arm poly-2-ethyl-2-oxazine with calix[4]arene core was synthesized. Molar masses of the polymer star and its arms were 7100 and 1300 g·mol−1, respectively. The self-organization of molecules in aqueous solutions was investigated using light scattering and turbidity within a wide concentration interval. At room temperature, in solutions of synthesized polymer, in addition to macromolecules, a small fraction of aggregates is observed, which result from the interactions of hydrophobic branching centers. Phase separation temperatures decrease with increase in concentration. Low critical solution temperature for the investigated star-shaped poly-2-ethyl-2-oxazine is lower than LCST for aqueous solutions of linear and star-shaped poly-2-ethyl-oxazoline and higher than that for star-shaped poly-2-isopropyl-2-oxazine with calix[4]arene core and similar molar mass. |
| Databáze: | OpenAIRE |
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