Hyperbranched polysiloxane with highly constrained rings and the effect of the attached arms on the assembly behavior

Wu, Chunyan; Hu, Chunhua; Liu, Yuzhou

doi:10.1039/c7py01177f

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…The complete absence of terminating hydride is also confirmed by 1 H/ 29 Si-NMR in Figure 1 A,B), which also indicates the absence of any methoxy leftover within polymer 1 , detailed analysis in Figures S3 and S4 . These results are highly similar to our previous report about the reaction between tetramethyldisiloxane and tetraethylorthosilicate, in which all hydride and methoxy groups fully react to form a hyperbranched polymer [ 36 ].…”

Section: Resultssupporting

confidence: 91%

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Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

Liu

Meng

et al. 2018

Polymers

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Abstract:Hyperbranched siloxane-based polymers with ultra-high molecular weight were synthesized by the Piers-Rubinsztajn reaction between octakis(dimethylsiloxy) octasilsesquioxane with different dialkoxysilanes, using tris(pentafluorophenyl) borane as the catalyst. The origin of the high molecular weight is explained by the high reactivity of the catalyst and strain energy of isolated small molecule in which all eight silane groups close into rings on the sides of a single cubic cage.The structural tuneability was further demonstrated by use of methyl(3-chloropropyl)diethoxysilane, which generates a polymer with similar ultra-high molecular weight. Introduction of phosphonate groups through the chloropropyl sites later leads to functionalized polymers which can encapsulate various transition metal nanoparticles.

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Section: Resultssupporting

confidence: 91%

“…We previously reported the synthesis of hyperbranched polysiloxanes through de-alkyl coupling reaction between hydrosilane and tetraethylorthosilicate catalyzed by B(C 6 F 5 ) 3 [36]. The high efficiency obtained encouraged us to investigate the possibility of combining Q 8 DMS with different dialkoxysilanes to generate HPCCPs.…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

Liu

Meng

et al. 2018

Polymers

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“…Matsumoto et al presented a highly selective sequence-controlled synthesis of linear, branched, and cyclic oligosiloxanes by the iteration of tris(pentafluorophenyl)borane (B(C 6 F 5 ) 3 )-catalyzed P-R reaction and hydrosilylation of carbonyl compounds [33]. The P-R reaction has also been applied to synthesize Si-HBPs [34][35][36][37]. For example, Liu et al reported hyperbranched POSS-based polymers with ultra-high molecular weight by the P-R reaction between octakis(dimethylsiloxy)octa-silsesquioxane with different dialkoxysilanes [34].…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched Polycarbosiloxanes: Synthesis by Piers-Rubinsztajn Reaction and Application as Precursors to Magnetoceramics

Zhang

Xue

et al. 2020

Polymers

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Silicon-containing hyperbranched polymers (Si-HBPs) have drawn much attention due to their promising applications. However, the construction of Si-HBPs, especially those containing functional aromatic units in the branched backbones by the simple and efficient Piers-Rubinsztajn (P-R) reaction, has been rarely developed. Herein, a series of novel hyperbranched polycarbosiloxanes were prepared by the P-R reactions of methyl-, or phenyl-triethoxylsilane and three Si-H containing aromatic monomers, including 1,4-bis(dimethylsilyl)benzene, 4,4 -bis(dimethylsilyl)-1,1 -biphenyl and 1,1 -bis(dimethylsilyl)ferrocene, using B(C 6 F 5 ) 3 as the catalyst for 0.5 h at room temperature. Their structures were fully characterized by Fourier transform infrared spectroscopy, 1 H NMR, 13 C NMR, and 29 Si NMR. The molecular weights were determined by gel permeation chromatography. The degrees of branching of these polymers were 0.69-0.89, which were calculated based on the quantitative 29 Si NMR spectroscopy. For applications, the ferrocene-linked Si-HBP can be used as precursors to produce functional ceramics with good magnetizability after pyrolysis at elevated temperature.

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Breathable hyperbranched polysiloxane for the conservation of silicate cultural heritages

Zhao

Shao

et al. 2022

J Sol-Gel Sci Technol

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Hyperbranched polysiloxane with highly constrained rings and the effect of the attached arms on the assembly behavior

Abstract: Attachment of incompatible arms to a designed hyperbranched polymer with highly constrained rings and the toroidal assembly.

Cited by 3 publications

References 31 publications

Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

Hyperbranched Polysiloxanes Based on Polyhedral Oligomeric Silsesquioxane Cages with Ultra-High Molecular Weight and Structural Tuneability

Hyperbranched Polycarbosiloxanes: Synthesis by Piers-Rubinsztajn Reaction and Application as Precursors to Magnetoceramics

Breathable hyperbranched polysiloxane for the conservation of silicate cultural heritages

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