Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
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| Authors: | Pavel A Tikhonov Nataliya G Vasilenko Marat O Gallyamov Georgii V Cherkaev Viktor G Vasil&#x;ev Nina V Demchenko Mikhail I Buzin Sergey G Vasil&#x;ev Aziz M Muzafarov |
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| Institution: | 1.Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, Russia; (P.A.T.); (G.V.C.); (N.V.D.); (A.M.M.);2.Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russia; (M.O.G.); (V.G.V.); (M.I.B.);3.Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia;4.Institute of Problems of Chemical Physics, Russian Academy of Sciences, Academician Semeonov av. 1, Chernogolovka, 142432 Moscow, Russia; |
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| Abstract: | New multiarm stars have been synthesized based on polylithium derivatives of high-generation carbosilane dendrimers. In the synthesis of multiarm stars based on the eighth-generation dendrimer, 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 objects of this type were isolated from the reaction mixture. The study of the rheology of multiarm stars based on sixth-generation dendrimers made it possible to determine the activation energies of viscous flow in these objects, which makes it possible to consider them as objects with a macromolecular nature and a reptation flow mechanism. |
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| Keywords: | polylithium initiator multiarm stars anionic polymerization of hexamethylcyclotrisiloxane carbosilane dendrimers |
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