Facile preparation of silica-supported Ti catalysts effective for the epoxidation of cyclooctene using Ti-bridged silsesquioxanes

Wada, Kenji; Sakugawa, Shuko; Inoue, Masashi

doi:10.1039/c2cc33571a

Cited by 12 publications

(6 citation statements)

References 40 publications

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“…134-1As an extension of this initial work, Wada et al (2012) used similar bridged titanium POMS materials for the epoxidation of cyclooctene (Fig. 13).…”

Section: Metallasilsesquioxanesmentioning

confidence: 99%

Polyhedral Silsesquioxanes

Jennings¹,

Iacono²,

Mabry³

2016

Handbook of Sol-Gel Science and Technology

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This chapter aims to highlight the selected applications of polyhedral oligomeric silsesquioxanes (POSS). A brief introduction will be given and used to highlight the use of solution-gelation chemistry for the synthesis of POSS. Furthermore, the different three-dimensional structures, including fully and incompletely condensed, random, and ladder structures, will be discussed. Subsequently, the use of the various POSS structures as fillers in polymeric nanocomposites will be examined, with a focus on polymer blends, pendant polymers, bead polymers,

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“…134-1As an extension of this initial work, Wada et al (2012) used similar bridged titanium POMS materials for the epoxidation of cyclooctene (Fig. 13).…”

Section: Metallasilsesquioxanesmentioning

confidence: 99%

Polyhedral Silsesquioxanes

Jennings¹,

Iacono²,

Mabry³

2016

Handbook of Sol-Gel Science and Technology

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“…Yang et al used Lewis acids (FeCl 3 , AlCl 3 , and CuCl 2 ) to cure urushiol-based PBZ at low temperatures and revealed the effect of Lewis acids on the structure and properties of the polymer [ 38 ]. M-POSS can be used in nanocomposites due to its potential catalytic activity, serving as a novel catalyst in homogeneous and heterogeneous catalysis (e.g., olefin polymerization, metathesis, and epoxidation) [ 39 , 40 , 41 , 42 , 43 ]. Mehta et al used trisilol isooctyl POSS as the catalyst and disiilol isobutyl POSS as the co-catalyst to catalyze ethylene polymerization with ethyl aluminum sesquichloride [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Catalyzing Benzoxazine Polymerization with Titanium-Containing POSS to Reduce the Curing Temperature and Improve Thermal Stability

Sun

Chai

et al. 2023

Molecules

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Trisilanolphenyl-polyhedral oligomeric silsesquioxane titanium (Ti-Ph-POSS) was synthesized through the corner-capping reaction, and Ti-Ph-POSS was dispersed in benzoxazine (BZ) to prepare Ti-Ph-POSS/PBZ composite materials. Ti-Ph-POSS could catalyze the ring-opening polymerization (ROP) of BZ and reduce the curing temperature of benzoxazine. In addition, Ti immobilized on the Ti-Ph-POSS cage could form covalent bonds with the N or O atoms on polybenzoxazine, improving the thermal stability of PBZ. The catalytic activity of the Ti-Ph-POSS/BZ mixtures was assessed and identified through 1H nuclear magnetic resonance (1H-NMR) and Fourier-transform infrared (FTIR) analyses, while thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) were used to determine the thermal properties of the composite. It was found that PBZ exhibited a higher glass transition temperature (Tg) and better thermal stability when Ti-Ph-POSS was added. The curing behavior of the Ti-Ph-POSS/BZ mixtures showed that the initial (Ti) and peak (Tp) curing temperatures sharply decreased as the content of Ti-Ph-POSS and the heating rate increased. The curing kinetics of these Ti-Ph-POSS/BZ systems were analyzed using the Kissinger method, and the morphology of Ti-Ph-POSS/PBZ was determined via scanning electron microscopy (SEM). It was found that the Ti-Ph-POSS particles were well distributed in the composites. When the content exceeded 2 wt%, several Ti-Ph-POSS particles could not react with benzoxazine and were only dispersed within the PBZ matrix, resulting in aggregation of the Ti-Ph-POSS molecules.

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“…15–18 Ti-containing siloxane/silsesquioxane molecules have been synthesized as active homogeneous catalysts, 49–51 immobilized on a silica substrate, and demonstrated as a potential precursor for heterogeneous catalysts. 52–59 Very recently, linking the siloxane cage with four-coordinated Ti species was demonstrated as another approach to obtain a catalyst with unique micro/mesoporosity. 60…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18] Ti-containing siloxane/silsesquioxane molecules have been synthesized as active homogeneous catalysts, [49][50][51] immobilized on a silica substrate, and demonstrated as a potential precursor for heterogeneous catalysts. [52][53][54][55][56][57][58][59] Very recently, linking the siloxane cage with four-coordinated Ti species was demonstrated as another approach to obtain a catalyst with unique micro/mesoporosity. 60 In this study, titanosilicate nanoparticles (denoted as Poly-TiPOSS) were synthesized via a simple condensation reaction between titanosilicate silsesquioxane (denoted as TiPOSS) and tetraethyl orthosilicate (TEOS) as an additional Si source (Fig.…”

Section: Introductionmentioning

confidence: 99%