Abstract
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(C6F5)3 as the catalyst for 0.5 h at room temperature. Their structures were fully characterized by Fourier transform infrared spectroscopy, 1H NMR, 13C NMR, and 29Si 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 29Si 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.
Highlights
Hyperbranched polymers (HBPs), which are defined as highly branched three-dimensional macromolecules, have attracted great attention, due to their unique structures and properties such as abundant functional groups, intramolecular cavities, low viscosity and high solubility, and extensive applications in photoelectric materials, coatings, adhesives, membranes, sensors, catalysis and biomaterials [1,2,3,4,5,6,7]
The silicon-containing HBPs (Si-HBPs) can be prepared by several strategies, including hydrosilylation reactions from silicon-containing monomers containing Si–H bonds and unsaturated bonds [16,17], organometallic reaction (e.g., Grignard reaction) [13,18] and polycondensation reaction [19]
The molecular weights of the polymers and their polydispersity indices (PDI, Mw /Mn ) were determined by a Waters 1515 gel permeation chromatography (GPC) system equipped with a refractive index detector (Milford, MA, USA), using monodisperse polystyrene (PS) as calibration standards and THF containing 0.05
Summary
Hyperbranched polymers (HBPs), which are defined as highly branched three-dimensional macromolecules, have attracted great attention, due to their unique structures and properties such as abundant functional groups, intramolecular cavities, low viscosity and high solubility, and extensive applications in photoelectric materials, coatings, adhesives, membranes, sensors, catalysis and biomaterials [1,2,3,4,5,6,7]. 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]. We and other researchers have introduced click reactions to prepare Si-HBPs [12,20,21]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
