Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center
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 l...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/11/3280 |
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| author | Pavel A. Tikhonov Nataliya G. Vasilenko Marat O. Gallyamov Georgii V. Cherkaev Viktor G. Vasil’ev Nina V. Demchenko Mikhail I. Buzin Sergey G. Vasil’ev Aziz M. Muzafarov |
| author_facet | Pavel A. Tikhonov Nataliya G. Vasilenko Marat O. Gallyamov Georgii V. Cherkaev Viktor G. Vasil’ev Nina V. Demchenko Mikhail I. Buzin Sergey G. Vasil’ev Aziz M. Muzafarov |
| author_sort | Pavel A. Tikhonov |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T10:54:52Z |
| format | Article |
| id | doaj.art-b11bbcb620a84e479411b24e2ac7e6af |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T10:54:52Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-b11bbcb620a84e479411b24e2ac7e6af2023-11-21T21:57:38ZengMDPI AGMolecules1420-30492021-05-012611328010.3390/molecules26113280Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching CenterPavel A. Tikhonov0Nataliya G. Vasilenko1Marat O. Gallyamov2Georgii V. Cherkaev3Viktor G. Vasil’ev4Nina V. Demchenko5Mikhail I. Buzin6Sergey G. Vasil’ev7Aziz M. Muzafarov8Enikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, RussiaNesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, RussiaNesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, RussiaNesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, RussiaInstitute of Problems of Chemical Physics, Russian Academy of Sciences, Academician Semeonov av. 1, Chernogolovka, 142432 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, 117393 Moscow, RussiaNew 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.https://www.mdpi.com/1420-3049/26/11/3280polylithium initiatormultiarm starsanionic polymerization of hexamethylcyclotrisiloxanecarbosilane dendrimers |
| spellingShingle | Pavel A. Tikhonov Nataliya G. Vasilenko Marat O. Gallyamov Georgii V. Cherkaev Viktor G. Vasil’ev Nina V. Demchenko Mikhail I. Buzin Sergey G. Vasil’ev Aziz M. Muzafarov Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center Molecules polylithium initiator multiarm stars anionic polymerization of hexamethylcyclotrisiloxane carbosilane dendrimers |
| title | Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
| title_full | Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
| title_fullStr | Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
| title_full_unstemmed | Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
| title_short | Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center |
| title_sort | multiarm star shaped polydimethylsiloxanes with a dendritic branching center |
| topic | polylithium initiator multiarm stars anionic polymerization of hexamethylcyclotrisiloxane carbosilane dendrimers |
| url | https://www.mdpi.com/1420-3049/26/11/3280 |
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