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Your search keyword '"Zhulina, Ekaterina B."' showing total 22 results
Start Over Author "Zhulina, Ekaterina B." Publication Year Range Last 3 years
22 results on '"Zhulina, Ekaterina B."'

15. Injectable bottlebrush hydrogels with tissue-mimetic mechanical properties

Author

Vashahi, Foad, primary, Martinez, Michael R., additional, Dashtimoghadam, Erfan, additional, Fahimipour, Farahnaz, additional, Keith, Andrew N., additional, Bersenev, Egor A., additional, Ivanov, Dimitri A., additional, Zhulina, Ekaterina B., additional, Popryadukhin, Pavel, additional, Matyjaszewski, Krzysztof, additional, Vatankhah-Varnosfaderani, Mohammad, additional, and Sheiko, Sergei S., additional

Published
2022
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21. Theory of Y‐ and Comb‐Shaped Polymer Brushes: The Parabolic Potential Framework.

Author

Lebedeva, Inna O., Zhulina, Ekaterina B., Leermakers, Frans A.M., Sheiko, Sergei S., and Borisov, Oleg V.

Subjects
*BRANCHED polymers, *SELF-consistent field theory, *DEGREE of polymerization, *POLYMERS
Abstract

The parabolic approximation for self‐consistent molecular potential is widely used for theoretical analysis of conformational and thermodynamic properties of polymer brushes formed by linear or branched macromolecules. The architecture‐dependent parameter of the potential (topological coefficient) can be calculated for arbitrary branched polymer architecture from the condition of elastic stress balance in all the branching points. However, the calculation routine for the topological coefficient does not allow unambiguously identifying the range of applicability and the accuracy of the parabolic approximation. Here the limits of applicability of parabolic approximation are explored by means of numerical self‐consistent field method for brushes formed by Y‐shaped and comb‐like polymers. It is demonstrated that violation of the potential parabolic shape can be evidenced by appearance of multimodal distribution of the end monomer unit in the longest elastic path of the macromolecule. The asymmetry of branching of Y‐shaped polymers does not disturb the parabolic shape of the potential as long as the degree of polymerization of the root segment remains sufficiently large. The same applies to comb‐shape polymers with sufficiently long main chain and large number of branching points. For short comb‐like polymers multiple modes in the distribution of the end monomer unit of the main chain are observed and related to deviation from the parabolic shape of the potential. [ABSTRACT FROM AUTHOR]

Published
2022
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22. Brushes of Cycled Macromolecules: Structure and Lubricating Properties

Author

Zhulina, Ekaterina B., Leermakers, Frans A. M., and Borisov, Oleg V.

Abstract

We present a theory describing structural properties of brushes formed by cycled macromolecules tethered to planar surface. Diverse architectures of macromolecules that differ with respect to position and number of subchains in macrocycle are considered. We use the self-consistent field analytical approach based on strong stretching approximation and assumption of Gaussian elasticity of brush-forming molecules. Predictions of the analytical theory are systematically compared to the results of numerical SF-SCF modeling. Similarity of the effects of cyclization and branching on large-scale properties of polymer brush is demonstrated. It is also predicted that weaker interpenetration of sliding brushes formed by cyclic macromolecules might enhance their performance as lubricants.

Published
2024
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