Preparation and properties of organic–inorganic hybrid materials using titanium phosphonate cluster

Hayami, Ryohei; Wada, Keisuke; Nishikawa, Izumi; Sagawa, Tadashi; Yamamoto, Kazuki; Tsukada, Shinya; Gunji, Takahiro

doi:10.1038/pj.2017.34

Cited by 21 publications

(5 citation statements)

References 12 publications

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“…However, variations in thermal degradation appeared minimal, potentially due to the structural similarities of the CLs. It is postulated that the thermal attributes of PDMS materials might be more in uenced by the PDMS chain length than by the degree of crosslinking [7,[33][34][35][36].…”

Section: Properties Of Pdms Cross-linked With Si-h Terminated Teos He...mentioning

confidence: 99%

“…Our research has also delved into organic-inorganic hybrid materials. Examples include triethoxysilyl modi ed C 60 , polyhedral oligomeric silsesquioxane, and titanium phosphonate clusters as inorganic segments, combined with hydroxy-terminated polydimethylsiloxane (PDMS) as the organic segment, resulting in Class II hybrid materials [5][6][7]. Notably, the siloxane/epoxy hybrid within Class II displayed enhanced physical properties, exhibiting high mechanical strength when the organic and inorganic polymers were joined through covalent bonds [8].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

Sato,

Hayami,

Yamamoto

et al. 2023

Preprint

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Linear oligoethoxysiloxanes were hydrolyzed, and the resulting hydrolyzates were dimethylsilylated to produce Si–H terminated ethoxysiloxanes (CLs). These CLs were characterized using gel permeation chromatography, nuclear magnetic resonance, and Fourier-transform infrared spectroscopy. The results indicated the formation of highly condensed cyclic siloxanes, four-membered cyclic siloxanes, and linearly condensed cyclic siloxanes when derived from tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane, respectively. The CLs were subsequently reacted with vinyl-terminated polydimethylsiloxane in the presence of the Karstedt catalyst to yield PDMS elastomers, which are comprised of di- and quadra-functional silicones. Tests for transmittance, thermal properties, tensile strength, and swelling in toluene were conducted to assess the impact of the molecular weight and microstructure of the CLs on the final products. As the number of silicon atoms in the linear oligoethoxysiloxanes increased, there was a noticeable rise in the secant modulus and a reduction in the degree of swelling. These findings suggest that the structure of PDMS elastomers can be tailored by varying the structure of the linear oligosiloxanes used as a cross-linking agent.

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Section: Properties Of Pdms Cross-linked With Si-h Terminated Teos He...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

Sato,

Hayami,

Yamamoto

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our research has also delved into organic-inorganic hybrid materials. Examples include triethoxysilyl modified C 60 , polyhedral oligomeric silsesquioxane, and titanium phosphonate clusters as inorganic segments, combined with hydroxy-terminated polydimethylsiloxane (PDMS) as the organic segment, resulting in Class II hybrid materials [5][6][7]. Notably, the siloxane/epoxy hybrid within Class II displayed enhanced physical properties, exhibiting high mechanical strength when the organic and inorganic polymers were joined through covalent bonds [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of PDMS elastomer cross-linked with hydrolyzate of tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane: influence of cross-linker structure

Sato,

Hayami,

Yamamoto

et al. 2023

J Sol-Gel Sci Technol

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Ethoxysilanes were hydrolyzed, and the resulting hydrolyzates were dimethylsilylated to produce Si–H terminated oligosiloxanes (CLs). These CLs were characterized using gel permeation chromatography, nuclear magnetic resonance, and Fourier-transform infrared spectroscopy. The results indicated the formation of highly condensed cyclic siloxanes, four-membered cyclic siloxanes, and linearly condensed cyclic siloxanes when derived from tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane, respectively. The CLs were subsequently reacted with vinyl-terminated polydimethylsiloxane in the presence of the Karstedt catalyst to yield PDMS elastomers, which are comprised of di- and quadra-functional silicones. Tests for transmittance, thermal properties, tensile strength, and swelling in toluene were conducted to assess the impact of the molecular weight and microstructure of the CLs on the final products. As the number of silicon atoms in the ethoxysilanes increased, there was a rise in the secant modulus and a reduction in the degree of swelling. These findings suggest that the structure of PDMS elastomers can be tailored by varying the structure of the ethoxysilanes used as a cross-linking agent. Graphical Abstract

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“…Phosphorus (V)-substituted titanium-oxo clusters, comprising phosphatitanoxane bonding (Ti-O-P) to exhibit high stability against hydrolysis, [1,2] are synthesized by the reaction of a titanium source with organophosphorus (V) compounds, such as phosphate, phosphonate, or phosphinate. [3] These clusters have been applied in photocatalysts, [4][5][6] catalysts for the epoxidation of olefines, [7,8] organic-inorganic hybrids, [9][10][11][12] and model compounds for titanium dioxide. [13,14] Titanium phosphonate alkoxide clusters are phosphorus (V)-substituted titanium-oxo clusters that are synthesized by the simple reaction of titanium alkoxide with organophosphonic acid.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel reaction of titanium phosphonate alkoxide cluster

Tsukagoshi

Sato

Yamamoto

et al. 2022

Applied Organom Chemis

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The synthesis and properties of titanium phosphonate cluster molecules have been investigated; however, nothing has been done to study not only the catalytic ability of a hydrolyzed cluster but also a behavior of hydrolysis–polycondensation by solvents. The sol–gel reaction of [Ti4(μ3‐O)(OiPr)5(μ‐OiPr)3(O3PPh)3]·thf (Ti4P3Ph) was performed in tetrahydrofuran (THF), toluene, and acetone. The hydrolysis–polycondensation of Ti4P3Ph proceeded in THF and toluene, while Ti4P3Ph in acetone proceeded in two paths (hydrolysis–polycondensation and nonhydrolysis–polycondensation). The hydrolyzed Ti4P3Ph retained its cluster structure, while the calcined Ti4P3Ph at 300°C contained a collapsed cluster structure. The specific surface areas of the hydrolyzed Ti4P3Ph in THF, toluene, and acetone were 154, 302, and 7 m2 g−1, respectively. The photodegradation ability of the hydrolyzed Ti4P3Ph for methylene blue was confirmed by ultraviolet irradiation at 365 nm; however, that of the calcined Ti4P3Ph was not. It was considered that the calcined Ti4P3Ph did not retain its cluster structure. The photocatalytic ability of the hydrolyzed Ti4P3Ph was high in the order of toluene > THF > pristine > acetone. The gels retained cluster structure have higher photocatalytic ability than pristine cluster; however, the gel contained a collapsed cluster structure was found no catalytic ability.

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Preparation and properties of organic–inorganic hybrid materials using titanium phosphonate cluster

Cited by 21 publications

References 12 publications

Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

Preparation and Properties of PDMS elastomer cross-linked with hydrolyzate of TEOS, HEDS, or OETS oligomers: influence of cross-linker structure

Preparation and properties of PDMS elastomer cross-linked with hydrolyzate of tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane: influence of cross-linker structure

Sol–gel reaction of titanium phosphonate alkoxide cluster

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