Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

Wang, Mingyue; Chi, Hong; Joshy, K S; Wang, Fuke

doi:10.3390/polym11122098

Cited by 53 publications

(39 citation statements)

References 130 publications

(154 reference statements)

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“…As a proof of concept, the functionalization of 4a through hydrosilylation was achieved (Scheme 4). In the presence of dimethylphenylsilane and a very small amount of Karstedt catalyst (0.02 mol% Pt per C=C), 4a quantitatively yielded laddersiloxane 5 as a mixture of three stereoisomers as expected and shown by the resonance patterns of the 1 H, 13 C and 29 Si NMR spectra (see supporting information).…”

Section: Introductionmentioning

confidence: 60%

“…Recently, the development of difunctionalized double-decker silsesquioxanes (DDSQ), another class of silsesquioxane compounds involving Si-O-Si bonds different from the symmetrical cubic T 8 -POSS, opened new opportunities to design hybrid materials [12]. For example, difuctionalized D 2 T 8 DDSQ has been successfully incorporated into the backbone chain of polymers and they conferred excellent transparency and exibility, good solubility in addition to good thermal, mechanical and dielectric properties [13].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

Liu

Endo

Zhang

et al. 2021

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PurposeSilsesquioxanes with well-de ned structures have been of great interest recently because of their superior properties. Among them, laddersiloxanes (ladder-type silsesquioxanes with de ned structure) were less explored because step-by-step synthesis is usually necessary. In order to investigate the properties of laddersiloxane, and apply these compounds to the monomers of high function materials, we prepared laddersiloxanes with reactive vinyl groups. MethodsThe target compounds were obtained in a two-step reaction from commercially available alkoxysilanes, and total yields were good. Three stereoisomers included in the products were fully investigated by spectroscopic methods and structures were determined. ResultsAs an extension of our previous research of constructing new laddersiloxanes, here we will describe the synthesis, characterization, and functionalization of novel divinyl-substituted laddersiloxanes. Further transformation of all products proceeded smoothly, and extended laddersiloxanes were obtained by hydrosilylation. One of the isomers was isolated and the structure was determined unequivocally by X-ray analysis. ConclusionThe laddersiloxanes described here have two reactive vinyl groups at each end of the molecule. Various reactions including hydrosilylation, polymerization, or ole n metathesis are possible, thus these compounds can be potential monomers for highly functionalized materials.

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Section: Introductionmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

Liu

Endo

Zhang

et al. 2021

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“…In this context, our research group at the University of Catania, in collaboration with eminent researchers in the field, tested the stabilization of different polymers, synthetics or naturals, such as polyethersulfone (PES), ethylene propylene diene monomer (EPDM), polyethylene oxide (PEO), and chitosan by the incorporation of polyhedral oligomeric silsesquioxanes (POSS) molecules [ 20 , 21 , 22 , 23 , 24 ]. The use of POSS in the making of polymer composites has grown exponentially in the last 30 years [ 25 , 26 , 27 ]. Represented in their most common form by the symbol T 8 and having a diameter usually falling in the range of 1.5–3 nm, these molecules comprise a silicon and oxygen cage completed by organic groups that are covalently bonded with silicon atoms [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

et al. 2020

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A comprehensive kinetics degradation study is carried out on novel multiple cages polyhedral oligomeric silsesquioxane (POSS)/polystyrene (PS) composites at 5% (w/w) of POSS to assess their thermal behavior with respect to the control PS and other similar POSS/PS systems studied in the past. The composites are synthesized by in situ polymerization of styrene in the presence of POSSs and characterized by 1H-NMR. The characteristics of thermal parameters are determined using kinetics literature methods, such as those developed by Kissinger and Flynn, Wall, and Ozawa (FWO), and discussed and compared with each other and with those obtained in the past for similar POSS/PS composites. A good improvement in the thermal stability with respect to neat polymer is found, but not with respect to those obtained in the past for polystyrene reinforced with single- or double-POSS cages. This behavior is attributed to the greater steric hindrance of the three-cages POSS compared with those of single- or double-cage POSS molecules.

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“…Depending on the precursor, various linear or nanostructures with Si-O-Si repeating units and side functional groups can be obtained through hydrolysis reactions of silanes. [23][24][25] The produced silicones can be used to modulate the mechanical performance while maintaining or optimizing the optical properties of polymers. [26,27] Additionally, primary amino groups are widely used to enhance the affinity of materials to heavy metals [28,29] because of the strong coordination and electron-donating interaction between them.…”

Section: Introductionmentioning

confidence: 99%

Facile and Eco‐Friendly Fabrication of Multifunctional Melamine Sponge for Labeled Cr(VI) Removal and Highly Efficient Oil/Water Separation

Wang

Sun

Zhang

2021

Macro Materials & Eng

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At present, the reported methods for removing heavy metal ions include membrane separation, chemical precipitation, solvent extraction, ion exchange, electrochemical, and advanced oxidation processes and adsorption. [3] Adsorption methods have been widely studied and applied because of their convenience and fast separation. As such, metal ions are affiliated to the adsorption material through physical adsorption, ion exchange, or surface complexation. [3,4] Subsequently, the adsorbent was separated and recycled. Common adsorption materials are in the form of aerogels, hydrogels, and composite membranes, [5] comprising cellulose, [6,7] activated carbon, [8] metal-organic framework, [9] clay, [10] graphene, [11] or biochar from aquatic plants. [12] For example, taking advantage of the high surfaceto-volume ratio of graphene, graphene oxide, and chitosan aerogels were used to remove copper ions by the complexation with amines and imines. [13] (3-glycidylpropyl) trimethoxysilane was used as a crosslinking agent for the hyperbranched polyethyleneimine and cellulose nanofibers. Copper ions were removed from wastewater by the complexation with amine and oxygen-containing groups (OH, CO, CO) on the cellulose aerogel. [14] Alginic acid is modified to amine-substituted carboxyl groups to improve the removal efficiency of lead ions in water. [15] Pan et al. prepared a hydrophobic polyvinyl formaldehyde sponge through the heterogeneous reaction of stearyl chloride with hydroxyl groups in a polyvinyl alcohol sponge. [16] Considering the oil/water mixture as a simulated oil slick system, these macroporous hydrophobic sponges showed high oil adsorption capacity, and the adsorbed oil could be collected by simple squeezing. The recovery factor was 94.8%.Key challenges still exist in realizing the aforementioned function and enhancing the efficiency of adsorption, especially when the adsorption of heavy metal ions in sewage is often hindered by oil contamination. Continuous effects are still required to develop an adsorbent that can remove heavy metal ions and separate oil from water. Herein, we propose a cost-effective heavy metal ion and oil adsorbent based on melamine sponge (MS) with in situ fluorescence properties. The cost-effective melamine sponge was silanized via a two-step hydrolysis reaction. The abundant amine groups and self-organized Schiffbase bonds endowed the sponge with fluorescence indicating Fabrication of multifunctional adsorbent of single-phase material is quite challenging and meaningful for water treatment. In this work, a polyaminosiloxane functionalized melamine sponge is used to remove both heavy metal ions and oil from water. Benefiting from its porous structure, superhydrophobic surface, and abundant amino groups on the surface, the sponge shows excellent performance in Cr(VI) removal and oil/water separation. Notably, the sponge exhibits fluorescent detection function for Cr(VI) owing to the packing of Schiff-base bonds, facilitating the adsorption process to be monitored in real time. The maxim...

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Progress in the Synthesis of Bifunctionalized Polyhedral Oligomeric Silsesquioxane

Cited by 53 publications

References 130 publications

Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

Kinetic Study of the Thermal and Thermo-Oxidative Degradations of Polystyrene Reinforced with Multiple-Cages POSS

Facile and Eco‐Friendly Fabrication of Multifunctional Melamine Sponge for Labeled Cr(VI) Removal and Highly Efficient Oil/Water Separation

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