Preparation and Properties of Siloxane/Epoxy Organic-Inorganic Hybrid Thin Films, Self-Standing Films, and Bulk Bodies

Gunji, Takahiro; Itagaki, Shotaro; Kajiwara, Takashi; Abe, Yoshimoto; Hatakeyama, Tadashi; Aoki, Ryuichi

doi:10.1295/polymj.pj2008290

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…As expected, the amino groups in the starting monomer efficiently autocatalyze the sol–gel reaction. Although the autocatalyzed sol–gel by the nitrogen flow method was reported, our synthesized PAPS and PAEAPS contained no ethoxy group, namely, the hydrolysis of the ethoxy group efficiently proceeded by the autocatalyzed sol–gel reaction. In the nitrogen flow method, water was removed by the flow together with ethanol to make the fine control of the reaction possible.…”

Section: Resultsmentioning

confidence: 88%

Antifogging Hybrid Materials Based on Amino-Functionalized Polysilsesquioxanes

Maeda

Hamada

Tsukada

et al. 2021

ACS Appl. Polym. Mater.

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The hybrid antifogging materials poly(3-aminopropyl)silsesquioxane (PAPS) and poly(3-(2-aminoethylaminopropyl)silsesquioxane) (PAEAPS) were prepared by sol–gel reactions that are autocatalyzed by the amine moieties of the monomers. PAPS and PAEAPS show good film-forming abilities, and the films obtained were found to be uniform and pinhole-free. X-ray diffraction analysis of PAPS and PAEAPS films indicated the formation of ladder-like structures. The PAPS and PAEAPS films exhibit high water uptakes of 34 and 42%, which are 1.2 and 1.5 times that of the typical antifogging polymer poly(vinyl alcohol) (PVA), respectively. Furthermore, the PAEAPS film exhibits a scratch resistance 4–6 times that of PVA, and a glass substrate bearing a PAEAPS film remained transparent after removal from a refrigerator. Thus, PAEAPS films exhibit high transparency under humidified conditions and show good antifogging ability.

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Section: Resultsmentioning

confidence: 88%

Antifogging Hybrid Materials Based on Amino-Functionalized Polysilsesquioxanes

Maeda

Hamada

Tsukada

et al. 2021

ACS Appl. Polym. Mater.

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“…Polymerization permanently locks the fractal nanoparticle aggregates into place. The resulting SERS substrates, which are based on an epoxide–siloxane matrix, are thermo-mechanically stable and possess good solvent resistance [79]. While a film comprising of epoxy alone would be rigid, the siloxane component in our system imparts flexibility to the thin film without compromising its transparency or thermo-mechanical stability (Figure S4, Supplementary Materials).…”

Section: Discussionmentioning

confidence: 99%

Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

Basker

Saravanamuttu

2017

Polymers

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Abstract:We present a facile, inexpensive route to free-standing, thermo-mechanically robust and flexible epoxy-siloxane substrates embedded with fractal aggregates of Au nanoparticles, and demonstrate their efficiency as substrates for surface enhanced Raman spectroscopy (SERS) at NIR wavelengths. The metallodielectric films are prepared by generating Au nanoparticles through the in-situ reduction of gold (III) chloride trihydrate in epoxypropoxypropyl terminated polydimethyl siloxane (EDMS). The metal nanoparticles spontaneously aggregate into fractal structures in the colloid, which could then be drop-cast onto a substrate. Subsequent UV-initiated cationic polymerization of epoxide moieties in EDMS transforms the fluid colloid into a thin, free-standing film, which contains a dense distribution of fractal aggregates of Au nanoparticles. We used electron and optical microscopy as well as UV-Vis-NIR spectrometry to monitor the evolution of nanoparticles and to optically and structurally characterize the resulting films. Raman spectroscopy of the chromophore Eosin Y adsorbed onto the metallodielectric films showed that they are excellent SERS substrates at NIR excitation with an enhancement factor of~9.3 × 10 3 .

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“…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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Preparation and Properties of Siloxane/Epoxy Organic-Inorganic Hybrid Thin Films, Self-Standing Films, and Bulk Bodies

Cited by 8 publications

References 16 publications

Antifogging Hybrid Materials Based on Amino-Functionalized Polysilsesquioxanes

Antifogging Hybrid Materials Based on Amino-Functionalized Polysilsesquioxanes

Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

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

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