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Behavior of hyperbranched polymers in solutions

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Abstract

Hyperbranched polycarbosilanes are investigated by the methods of molecular hydrodynamics and optics. Dependences of the hydrodynamic and conformational properties of these polymers on their molecular mass, the length of linear chains between branching points, and the chemical structure of end groups are analyzed. The hydrodynamic behavior of hyperbranched polycarbosilanes is explained by the fact that the dimensions of their macromolecules are compact and their shape is close to spherical. The convolution of chains between branching points becomes more pronounced with an increase in their length and a decrease in the molecular mass of the polymer. When end fluorinated groups are incorporated into the hyperbranched polycarbosilane, in thermodynamically good solvents and θ solvents, hydrodynamic characteristics change apparently owing to a change in the density of macromolecules in solution. In a poor solvent, the compaction of fluorinated macromolecules and a reduction in their shape asymmetry are observed. At a fixed branching degree, the hydrodynamic properties of hyperbranched polymers depend on the structural regularity of their macromolecules: In terms of hydrodynamic properties, the hyperbranched polycarbosilane with a degree of branching of 1 and a random distribution of branching points within the volume of a macro-molecule is appreciably different from a dendrimer of the same chemical nature and is close to polycarbosilanes with a degree of branching of 0.5.

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Correspondence to A. P. Filippov.

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Original Russian Text © A.P. Filippov, E.V. Belyaeva, E.B. Tarabukina, A.I. Amirova, 2011, published in Vysokomolekulyarnye Soedineniya, Ser. C, 2011, Vol. 53, No. 7, pp. 1281–1292.

This work was supported by the Russian Foundation for Basic Research (project no. 08-03-00421) and the Program of Basic Research of the Division of Chemistry and Materials Sciences, Russian Academy of Sciences, “Creation and Study of Macromolecules and Macromolecular Structures of New Generations.”

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Filippov, A.P., Belyaeva, E.V., Tarabukina, E.B. et al. Behavior of hyperbranched polymers in solutions. Polym. Sci. Ser. C 53, 107–117 (2011). https://doi.org/10.1134/S1811238211060014

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