POSS nanostructures in catalysis

Calabrese, Carla; Aprile, Carmela; Gruttadauria, Michelangelo; Giacalone, Francesco

doi:10.1039/d0cy01407a

Cited by 52 publications

(51 citation statements)

References 169 publications

(168 reference statements)

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“…[ 27,28 ] In the past two decades, POSS‐based materials have been widely investigated due to their high thermal stability, mechanical strength, large surface area, unique optoelectronic, and surface properties. [ 29–43 ] The intrinsic pore structure of POSS also make them promising for fabricating thermally and mechanically robust low‐ k materials, which were realized by Lercher et al. [ 13 ] and Fang et al.…”

Section: Introductionmentioning

confidence: 99%

Polyhedral Oligomeric Silsesquioxanes Based Ultralow‐k Materials: The Effect of Cage Size

Zhou

Guo

et al. 2021

Adv Funct Materials

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Polyhedral oligomeric silsesquioxanes (POSS) are of considerable interest as building blocks for preparing low‐k materials. To date T8 POSS has been extensively investigated while the potential of larger POSS cages remain an unexplored area. Herein, the first known contribution to map the role of POSS cage size on the dielectric and other comprehensive properties of hybrid materials with identical chemical compositions is described. First, three vinyl POSS (T8, T10, and T12) species are isolated from a commercial POSS mixture. Then, they are converted to benzocyclobutene functionalized and thermo‐crosslinked hybrid materials. It is found that the cage size can strongly affect their k values, more importantly, showing a linear decrease while increasing the cage volumes (k = 2.24, 2.02, and 1.83 for c‐T8B8, c‐T10B10, and c‐T12B12, respectively). This finding highlights a profound influence of POSS cage changes on dielectric properties and could be used to predict ultralow‐k (1.5–1.1) materials by extrapolating to larger T14, T16, and T18 POSS cages. Meanwhile, varying the cage size has no obvious effect on the materials’ other properties, and all of them exhibit good comprehensive properties. Moreover, such low‐k values can persist at high temperature and high humidity conditions, which affords some promising (ultra)low‐k dielectrics for modern integrated circuit development.

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Section: Introductionmentioning

confidence: 99%

Polyhedral Oligomeric Silsesquioxanes Based Ultralow‐k Materials: The Effect of Cage Size

Zhou

Guo

et al. 2021

Adv Funct Materials

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“…Cage silsesquioxanes have therefore been used as key starting blocks to design hybrid materials presenting a great potential in various elds including catalysis, photoactive materials, sensing, liquid crystals, energy-related materials, medicine, self-healing materials, biomass-based nanocomposites or coating materials [5][6][7][8][9][10][11]. To date, the cubic T 8 -POSSs have been the most widely used to reach hybrid polymers with various topologies (telechelic, star-shaped, side chain, cross-linked networks and so on) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the incorporation of POSS in polymer hybrids or polymer composite results in an enhancement of thermal stability, mechanical (strength, hardness) and dielectric properties [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

Liu

Endo

Zhang

et al. 2021

Silicon

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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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“…1 The applications involving the use of POSS cover a wide range of scientific fields including optics, photonics, electronics, catalysis, sensors and biology. [2][3][4][5][6][7] This broad window of possible applications is mainly related to the tuneable features of the nanocages as function of the nature of the organic corners together with the enhanced mechanical and thermal stability often provided by the inorganic core.…”

Section: Introductionmentioning

confidence: 99%

White light emitting silsesquioxane based materials: the importance of a ligand with rigid and directional arms

et al. 2022

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POSS nanostructures in catalysis

Abstract: Polyhedral oligomeric silsesquioxanes (POSS) are organic-inorganic hybrid molecules piquing the research interest thanks to their synergistic features. The great versatility of POSS nanostructures arises from the easy tunability of peripheral...

Cited by 52 publications

References 169 publications

Polyhedral Oligomeric Silsesquioxanes Based Ultralow‐k Materials: The Effect of Cage Size

Polyhedral Oligomeric Silsesquioxanes Based Ultralow‐k Materials: The Effect of Cage Size

Synthesis, Characterization, and Reaction of Divinyl‐substituted Laddersiloxanes

White light emitting silsesquioxane based materials: the importance of a ligand with rigid and directional arms

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