*Article* **Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center**

**Pavel A. Tikhonov 1, Nataliya G. Vasilenko 1,\*, Marat O. Gallyamov 2,3, Georgii V. Cherkaev 1, Viktor G. Vasil'ev 2, Nina V. Demchenko 1, Mikhail I. Buzin 2, Sergey G. Vasil'ev 4 and Aziz M. Muzafarov 1,2**


**Abstract:** New multiarm stars have been synthesized based on polylithium derivatives of highgeneration carbosilane dendrimers. In the synthesis of multiarm stars based on the eighth-generationdendrimer, steric hindrances were observed even during the synthesis of a polylithium initiator.Subsequently, this led to chain transfer reactions between growing arms, as well as other side effects.As a result, dense nanogel formations with a higher tendency of ordering than in classical objectsthis type were isolated from the reaction mixture. The study of the rheology of multiarm stars basedon sixth-generation dendrimers made it possible to determine the activation energies of viscous flowin these objects, which makes it possible to consider them as objects with a macromolecular natureand a reptation flow mechanism.

**Keywords:** polylithium initiator; multiarm stars; anionic polymerization of hexamethylcyclotrisiloxane; carbosilane dendrimers
