Grignard condensation routes to 1,3‐disilacyclobutane‐containing cyclolinear polycarbosilanes

Liu, Xinxing; Rathore, Jitendra S.; Dubois, Géraud; Interrante, L. V.

doi:10.1002/pola.28522

Cited by 7 publications

(11 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…20,21 The cross-linkable carbosilane polymers exhibit intriguing physical and chemical properties, which could be used as anticorrosion coatings. 22,23 A silicon-containing hyperbranched polycarbosilane, particularly phosphorus-hyperbranched carbosilanes, and a sulfur-containing hyperbranched polycarbosilane have emerged promising applications in polymer-derived ceramics, room-temperature-vulcanized silicone rubber, hightemperature-vulcanized silicone rubber, and coatings. 20,24,25 Inspired by these efforts, the silicon-containing hyperbranched polycarbosilane may be used to improve the corrosion resistance of the materials.…”

Section: Introductionmentioning

confidence: 99%

UV-Cured Transparent Flexible Silicone Materials with High Tensile Strength

Liu

Jiao

et al. 2020

ACS Omega

View full text Add to dashboard Cite

Transparent flexible silicone materials are useful in electronics, sensors, coatings, and so forth. However, to the best of our knowledge, the tensile strength of unreinforced silicone rubber is lower than 0.4 MPa, and the highest tensile strength of highly transparent silicone-modified materials is no more than 1.5 MPa. The poor mechanical property limits their further application in electronic devices. Here, a kind of UV-cured transparent flexible silicone materials with tensile strength as high as 2.2 MPa were prepared by a UV-initiated thiol−ene reaction of a sulfur-containing hyperbranched polycarbosilane and a thiol silicone resin. Interestingly, their tensile strength can increase from 2.2 to 5.6 and 5.7 MPa after being immersed in an aqueous solution of 10 wt % hydrochloric acid and 10 wt % NaCl for 7 days, respectively. It is argued that the increase of the tensile strength of cured films may be attributed to the −SiOCH 3 of the residual 3-trimethoxysilylpropanethiol in the sulfur-containing hyperbranched polycarbosilane. The performances of the cured materials were investigated in detail. These silicone materials exhibit transparency higher than 95% (wavenumber in the range of 400−800 nm), and the initial thermal decomposition temperatures of the cured materials are about 340 °C. These materials also show good anticorrosion property, and the mass loss of the materials immersed in the aqueous solution mediums is no more than 0.39 wt % even for 15 days.

show abstract

Section: Introductionmentioning

confidence: 99%

UV-Cured Transparent Flexible Silicone Materials with High Tensile Strength

Liu

Jiao

et al. 2020

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Among these HBPs, silicon-containing HBPs (Si-HBPs) are one of most important species and have attracted specific interest due to their potentials as silicon carbide ceramic precursors, degradable template molecules, optical materials, modifiers of composites, cell imaging, drug delivery, and gas chromatography [8][9][10][11][12][13][14][15]. The Si-HBPs can be prepared by several strategies, including hydrosilylation reactions from silicon-containing monomers containing Si-H bonds and unsaturated bonds (e.g., vinyl or alkynyl) [16,17], organometallic reaction (e.g., Grignard reaction) [13,18] and polycondensation reaction [19]. However, these strategies have some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

Xue

et al. 2020

Polymers

View full text Add to dashboard Cite

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.

show abstract

“…The Grignard coupling-based synthesis of polycarbosilanes has already been investigated in terms of mechanism, structural characteristics, kinetics, and side reactions; [8][9][10][11] however, out current understanding of polycarbosilane growth via this method is very limited. 12,13 For example, Guodong and Jang analyzed and discussed the change in the properties of polycarbosilane with the growth behavior of the polymer, but it is limited to the Yajima method. 14,15 In other cases, molecular weight was analyzed only to evaluate individual synthesis conditions, and the studies related to polymer growth were very insignicant.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 In other cases, molecular weight was analyzed only to evaluate individual synthesis conditions, and the studies related to polymer growth were very insignicant. [16][17][18]27 Therefore, in order to prepare the suitable precursor for the required properties of each different eld, it is necessary to understand growth behavior of the polymer and to control the reaction condition accordingly.…”

Section: Introductionmentioning

confidence: 99%