Preparation and film properties of polysiloxanes consisting of di- and quadra-functional hybrid units

Yamamoto, Kazuki; Shimoda, Tomoya; Sato, Yohei; Nakaya, Toshimi; Ohshita, Joji; Gunji, Takahiro

doi:10.1007/s10971-022-05806-z

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…Mackenzie et al highlighted that the mechanical properties of PDMS-SiO 2 are influenced by the composition ratio between PDMS and silicates [37]. Furthermore, the secant modulus and tensile strength of PDMS materials are contingent upon the crosslinked network [33,38]. Consequently, it is inferred that CL HEDS and CL OETS exhibit superior crosslinking efficiency compared to CL TEOS , consistent with earlier findings.…”

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

confidence: 63%

“…We proposed that the inhibit of cyclization of PDMS through thermal degradation and the small amount of decomposition of ethoxy groups in CLs may affect the residual mass; hence, PDMS-CL 40 wt% has lower residual mass than PDMS-CL 20 wt% due to the large amount of ethoxy groups. However, it is postulated that the thermal attributes of PDMS materials might be more influenced by the PDMS chain length than by the degree of crosslinking [11,[33][34][35][36]; therefore, this thermal degradation behavior of PDMS-CLs is expected to vary with PDMS chain length. A similar trend was noticed under aerobic conditions, with T d5 results detailed in Supplementary Table S1.…”

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

confidence: 99%

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

confidence: 63%

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

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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“…Mackenzie et al highlighted that the mechanical properties of PDMS-SiO 2 are in uenced by the composition ratio between PDMS and silicates [37]. Furthermore, the secant modulus and tensile strength of PDMS materials are contingent upon the crosslinked network [33,38]. Consequently, it is inferred that CP HEDS and CP OETS exhibit superior crosslinking e ciency compared to CL TEOS , consistent with earlier ndings.…”

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

confidence: 56%

“…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%

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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“…Chloro(triethoxy)silane (CTES) was prepared by the chlorination of TEOS, and triethoxysilanol (TESOL) was prepared by the hydrolysis of CTES [20,21]. The preparation methods and characterization are provided in Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

Hydrolysis and condensation behavior of tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane

Sato

Sugimoto

Iwashina

et al. 2023

Preprint

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In the initial stage of the hydrolysis–condensation of tetraethoxysilane (TEOS), hexaethoxydisiloxane (HEDS) and octaethoxytrisiloxane (OETS) are formed. However, little is known about the hydrolysis–condensation of HEDS and OETS. In this study, the hydrolysis–condensation of TEOS, HEDS, and OETS was investigated. HEDS and OETS were synthesized from diethoxy(diisocyanato)silane, a raw material with controllable functionality. The hydrolysis of TEOS, HEDS, and OETS was analyzed by mass spectroscopy, gel permeation chromatography, and nuclear magnetic resonance. The hydrolysis–condensation product of TEOS was a three-dimensional network-type polysiloxane. The hydrolysis–condensationproduct of HEDS consisted mainly of four-membered cyclic siloxane. The hydrolysis–condensation product of OETS consisted mainly of various membered cyclic siloxanes.

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Preparation and film properties of polysiloxanes consisting of di- and quadra-functional hybrid units

Cited by 5 publications

References 24 publications

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

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

Hydrolysis and condensation behavior of tetraethoxysilane, hexaethoxydisiloxane, and octaethoxytrisiloxane

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