Influence of the Composition of Block Copolymers of Poly-2-alkyl-5,6-dihydroxazines on Their Behavior in Solutions

IF 0.8 Q3 Engineering Nanotechnologies in Russia Pub Date : 2025-03-16 DOI:10.1134/S2635167624600998
A. P. Filippov, T. Yu. Kirila, S. V. Rodchenko, M. A. Golovina, N. D. Kozina, A. V. Tenkovtsev
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Abstract

Block copolymers of poly-2-ethyl-5,6-dihydrooxazine with poly-2-isopropyl-5,6-dihydrooxazine and poly-2-methyl-5,6-dihydrooxazine with poly-2-isopropyl-5,6-dihydrooxazine. Using NMR spectroscopy, it was determined that in copolymers the component fraction varies in a tenfold range. The hydrodynamic characteristics of the synthesized copolymers were determined using molecular hydrodynamics and optics methods and it was shown that they are flexible-chain polymers with an equilibrium rigidity of about 2 nm. The behavior of block copolymers in water-salt solutions depends on the content of blocks: an increase in the fraction of the more hydrophobic poly-2-isopropyl-5,6-dihydrooxazine leads to a decrease in the phase separation temperature and LCST. The addition of NaCl leads to a slight decrease in the phase separation temperature.

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聚2-烷基-5,6-二羟嗪嵌段共聚物组成对其在溶液中行为的影响
聚2-乙基-5,6-二氢恶嗪与聚2-异丙基-5,6-二氢恶嗪和聚2-甲基-5,6-二氢恶嗪与聚2-异丙基-5,6-二氢恶嗪的嵌段共聚物。利用核磁共振波谱法,确定共聚物的组分分数在十倍范围内变化。用分子水动力学和光学方法测定了合成的共聚物的水动力学特性,结果表明它们是一种平衡刚度约为2 nm的柔性链聚合物。嵌段共聚物在水盐溶液中的行为取决于嵌段含量:疏水性较强的聚2-异丙基-5,6-二氢恶嗪的分数增加,导致相分离温度和LCST降低。NaCl的加入使相分离温度略有降低。
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来源期刊
Nanotechnologies in Russia
Nanotechnologies in Russia NANOSCIENCE & NANOTECHNOLOGY-
CiteScore
1.20
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0.00%
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期刊介绍: Nanobiotechnology Reports publishes interdisciplinary research articles on fundamental aspects of the structure and properties of nanoscale objects and nanomaterials, polymeric and bioorganic molecules, and supramolecular and biohybrid complexes, as well as articles that discuss technologies for their preparation and processing, and practical implementation of products, devices, and nature-like systems based on them. The journal publishes original articles and reviews that meet the highest scientific quality standards in the following areas of science and technology studies: self-organizing structures and nanoassemblies; nanostructures, including nanotubes; functional and structural nanomaterials; polymeric, bioorganic, and hybrid nanomaterials; devices and products based on nanomaterials and nanotechnology; nanobiology and genetics, and omics technologies; nanobiomedicine and nanopharmaceutics; nanoelectronics and neuromorphic computing systems; neurocognitive systems and technologies; nanophotonics; natural science methods in a study of cultural heritage items; metrology, standardization, and monitoring in nanotechnology.
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