Carbosilane and Carbosiloxane Dendrimers

Kim, Chung-Kyun; Hong, Jang Hwan

doi:10.3390/molecules14093719

Cited by 21 publications

(16 citation statements)

References 42 publications

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“…Various strategies for multiarm star synthesis have been developed: convergent (arm-first) and divergent (core-first), as well as a combination of these two approaches [ 20 ]. The structures obtained with their help had properties so different from classical polymers that it was proposed to refer to them as macromolecular nanoobjects, or macromolecular particles, along with dendrimers, dense molecular brushes, and nanogels [ 21 , 22 ]. The boundary between low-arm stars that belong to branched polymers and multiarm stars can be determined using the α coefficient of the Mark–Kuhn–Houwink equation [η] = K η M α .…”

Section: Introductionmentioning

confidence: 99%

Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center

et al. 2021

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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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Section: Introductionmentioning

confidence: 99%

Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center

et al. 2021

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Section: Introductionmentioning

confidence: 99%

“…Many scientists have been interested in silsesquioxane cage materials with a well-defined structure because such materials have a low dielectric constant and excellent thermal stability [1,2,3,4,5,6,7]. Additionally, these compounds find a wide range of applications in polymers [8,9,10,11], sensors [12], catalysis [7,8,9,13], organic light-emitting diodes [14], host-guest complexes [15,16], and porous materials [17]. Most of the double-decker silsesquioxanes (DDSQ) [10,11,14,18,19,20,21,22,23,24,25,26] and polyhedral oligomeric silsesquioxanes [7,8,9,12,13,15,16,17,27,28,29] have a symmetrical structure with the same organic functional group on both sides.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Unsymmetrical Double-Decker Siloxane (Basket Cage)

2019

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The one-pot synthesis of an unsymmetrical double-decker siloxane with a novel structure via the reaction of double-decker tetrasodiumsilanolate with 1 equiv. of dichlorotetraphenyldisiloxane in the presence of an acid is reported herein for the first time. The target compound bearing all phenyl substituents on the unsymmetrical siloxane structure was successfully obtained, as confirmed by 1H-NMR, 13C-NMR, 29Si-NMR, IR, MALDI-TOF, and X-ray crystallography analyses. Additionally, the thermal properties of the product were evaluated by TG/DTA and compared with those of other siloxane cage compounds.

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“…Dendrimers are monodisperse large molecules composed of two or more tree‐like dendrons. They are highly branched macromolecules, obtained by a sequence of reaction steps and are characterized by their structure perfection. A dendrimer is usually symmetric around the core and often accept a spherical three dimensional morphology.…”

Section: Introductionmentioning

confidence: 99%

Dendrimer functionalized polysilane: An efficient and recyclable organocatalyst

Mangala

Sreekumar

2014

J of Applied Polymer Sci

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Polysilane supported dendrimer was efficiently utilized as an organocatalyst for Knoevenagel condensation reaction. Polysilane support was synthesized by the polymerization of trichloromethylsilane. The polypropyleneimine (PPI) dendrimer was grafted on the polymer support by divergent method. The dendrimer was synthesized up to three generations (G3). The dendrimer functionalized polysilane (PS-PPIG3) was found to contain high concentration of terminal amino groups. The catalytic activity of the PS-PPIG3 dendrimer was generalized by conducting the Knoevenagel condensation reaction with diverse sets of substrates, and was found to be an efficient organocatalyst. The condensation product could be easily separated from the reaction medium because of the heterogeneous nature of the polymer support. The reaction conditions were optimized, and the catalyst was found to be reusable.

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Carbosilane and Carbosiloxane Dendrimers

Cited by 21 publications

References 42 publications

Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center

Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center

Synthesis and Characterization of Unsymmetrical Double-Decker Siloxane (Basket Cage)

Dendrimer functionalized polysilane: An efficient and recyclable organocatalyst

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