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Article

Self-Assembly of Molecular Brushes with Polyimide Backbone and Amphiphilic Block Copolymer Side Chains in Selective Solvents

1
Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoy Pr. 31, 199004 Saint Petersburg, Russia
2
Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(12), 2922; https://doi.org/10.3390/polym12122922
Received: 12 November 2020 / Revised: 2 December 2020 / Accepted: 3 December 2020 / Published: 5 December 2020
(This article belongs to the Section Polymer Physics and Theory)
Three-component molecular brushes with a polyimide backbone and amphiphilic block copolymer side chains with different contents of the “inner” hydrophilic (poly(methacrylic acid)) and “outer” hydrophobic (poly(methyl methacrylate)) blocks were synthesized and characterized by molecular hydrodynamics and optics methods in solutions of chloroform, dimethylformamide, tetrahydrofuran and ethanol. The peculiarity of the studied polymers is the amphiphilic structure of the grafted chains. The molar masses of the molecular brushes were determined by static and dynamic light scattering in chloroform in which polymers form molecularly disperse solutions. Spontaneous self-assembly of macromolecules was detected in dimethylformamide, tetrahydrofuran and ethanol. The aggregates size depended on the thermodynamic quality of the solvent as well as on the macromolecular architectural parameters. In dimethylformamide and tetrahydrofuran, the distribution of hydrodynamic radii of aggregates was bimodal, while in ethanol, it was unimodal. Moreover, in ethanol, an increase in the poly(methyl methacrylate) content caused a decrease in the hydrodynamic radius of aggregates. A significant difference in the nature of the blocks included in the brushes determines the selectivity of the used solvents, since their thermodynamic quality with respect to the blocks is different. The macromolecules of the studied graft copolymers tend to self-organization in selective solvents with formation of a core–shell structure with an insoluble solvophobic core surrounded by the solvophilic shell of side chains. View Full-Text
Keywords: molecular brushes; amphiphilic side chains; molecular hydrodynamics and optics; conformational and hydrodynamic characteristics; aggregation molecular brushes; amphiphilic side chains; molecular hydrodynamics and optics; conformational and hydrodynamic characteristics; aggregation
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MDPI and ACS Style

Simonova, M.; Ivanov, I.; Meleshko, T.; Kopyshev, A.; Santer, S.; Yakimansky, A.; Filippov, A. Self-Assembly of Molecular Brushes with Polyimide Backbone and Amphiphilic Block Copolymer Side Chains in Selective Solvents. Polymers 2020, 12, 2922. https://doi.org/10.3390/polym12122922

AMA Style

Simonova M, Ivanov I, Meleshko T, Kopyshev A, Santer S, Yakimansky A, Filippov A. Self-Assembly of Molecular Brushes with Polyimide Backbone and Amphiphilic Block Copolymer Side Chains in Selective Solvents. Polymers. 2020; 12(12):2922. https://doi.org/10.3390/polym12122922

Chicago/Turabian Style

Simonova, Maria, Ivan Ivanov, Tamara Meleshko, Alexey Kopyshev, Svetlana Santer, Alexander Yakimansky, and Alexander Filippov. 2020. "Self-Assembly of Molecular Brushes with Polyimide Backbone and Amphiphilic Block Copolymer Side Chains in Selective Solvents" Polymers 12, no. 12: 2922. https://doi.org/10.3390/polym12122922

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