Solvent-Free One-Pot Synthesis of high performance silica/epoxy nanocomposites

Phonthamachai, Nopphawan; Chia, Hongling; Li, Xu; Wang, Fuke; Tjiu, Weng Weei; He, Chaobin

doi:10.1016/j.polymer.2010.09.059

Cited by 27 publications

(24 citation statements)

References 17 publications

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“…High‐resolution spectra of Si 2p and O 1s were analyzed to verify the value states of Si and O. As shown in Figure 6, the SiOSi peak is located at 102.7 eV 15. The binding energy of 101.8 eV represents the Si‐alkylamine of APTES, which was functionalized onto the silica surfaces during the sol‐gel process 15.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 6, the SiOSi peak is located at 102.7 eV 15. The binding energy of 101.8 eV represents the Si‐alkylamine of APTES, which was functionalized onto the silica surfaces during the sol‐gel process 15. Accordingly, nanosilica in WPU is speculated to have been synthesized by in situ hydrolysis and condensation of TEOS and/or APTES bonding at the end of the WPU molecule chain.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and characterization of nanosilica/waterborne polyurethane end‐capped by alkoxysilane via a sol‐gel process

Zhai

Liu

Peng

et al. 2012

J of Applied Polymer Sci

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A novel method was used to synthesis nanosilica/waterborne polyurethane (WPU) hybrids by in situ hydrolysis and condensation of tetraethyl orthosilicate (TEOS) and/or 3-aminopropyltriethoxylsilane bonding at the end of the WPU molecular chain. The hybrid was characterized by scanning electron microscopy, energy dispersive spectroscopy (EDS), transmission electron microscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The results showed that the nanosilica/WPU hybrids with well-dispersed nanosilica particles were synthesized, in which the particles had typical diameters of about 50 nm. In addition, XPS and FTIR analyses demonstrated that chemical interaction occurred between WPU and silica. The effects of TEOS on surface wettability, water resistance, mechanical strength, and thermal properties of the hybrid were also evaluated by contact angle measurements, water absorption tests, mechanical tests, and differential scanning calorimetry, respectively. An increase in advancing contact angles, water resistance, and tensile strength, as well as decrease in elongation at break and glass transition temperature, were obtained with the addition of TEOS. Water absorption decreased from 17.3 to 5.5%. The tensile strength increased to a maximum of 29.7 MPa, an increase of about 34%. Elongations at break of the hybrids decreased 191%. These results were attributed to the effects of the nanosilica and the chemical interaction between WPU and silica.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of nanosilica/waterborne polyurethane end‐capped by alkoxysilane via a sol‐gel process

Zhai

Liu

Peng

et al. 2012

J of Applied Polymer Sci

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“…In the polymer field, epoxy resins are well established thermosetting matrices of advanced composites, displaying a series of interesting characteristics such as good stiffness and specific strength, dimensional stability, chemical resistance and also strong adhesion to the embedded reinforcement . They are used as high grade synthetic resins in, for example, the electronics, aeronautics and astronautics industries and in surface coatings.…”

Section: Introductionmentioning

confidence: 99%

Physical study of room‐temperature‐cured epoxy/thermally reduced graphene oxides with various contents of oxygen‐containing groups

Hsu

Chang

et al. 2014

Polymer International

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In this study, the effects of different oxygen-containing group contents in thermally reduced graphene oxides (TRGs) for enhancing the physical properties of epoxy nancomposites was examined. The epoxy/TRG nanocomposites (ETNs) were prepared by a room temperature curing method in the presence of TRGs containing different oxygen-containing groups and were then characterized by Fourier transform infrared spectroscopy. TRG contents with higher oxygen-containing group contents (ca 33%) were found to show better dispersion capability in the epoxy matrix than TRGs with lower oxygen-containing group contents (ca 11%) based on morphological observations by transmission electron microscopy. The better dispersion capability of TRGs with higher oxygen-containing group contents in ETN membranes was found to lead to significantly enhanced mechanical strength, thermal stability and thermal conductivity based on measurements of dynamic mechanical analysis, tensile tests, thermogravimetric analysis and by the transient plane source technique.

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“…The lower hardness of R10-10-50% relative to R10-10 is due to the formation of aggregates via the fast hydrolysis/condensation of APS in air. 17 These aggregates were evidenced by the reduced transparency of the R10-10-50% coating. Therefore, appropriate APS dosage is critical for fabricating silicon-oxo-dominated nanocomposite coatings with optimized mechanical properties.…”

Section: The Macro-mechanical Properties Of the Silicon-oxo Coatingsmentioning

confidence: 99%

Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol

Zhou

2015

J Coat Technol Res

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Hardness and toughness are typically contradictive for sol-gel-derived coatings. In this article, thick ($15 lm) silicon-oxo-dominated nanocomposite coatings with high transparency were fabricated by incorporating 3-methacryloxypropyltrimethoxysilane (MPS)-modified silica alcosol into a moisture-curable polysiloxane oligomer and curing with the aid of 3-aminopropyltriehtoxysilane (APS). Effects of MPSto-SiO 2 molar ratio, SiO 2 nanoparticle content, APS dosage, and curing process on the mechanical properties were thoroughly investigated using a pencil hardness tester, a flexibility tester, and a nanoindentation tester. The best properties were achieved by a coating with an MPS-to-SiO 2 molar ratio of 0.1:1, a silica nanoparticle content of 10 wt%, and an APS dosage of 30 wt%. This coating demonstrated enhanced hardness (pencil hardness = 7H and microhardness = 626 MPa) and toughness (excellent flexibility of 5 mm in the mandrel bend test). Additional curing via aza-Michael addition between amino groups from APS and C=C groups from the polysiloxane oligomer can be accomplished at elevated temperatures. This enables further mechanical enhancement, namely hardness (9H and 1087 MPa), with adequate flexibility (10 mm). Such properties are superior to those reported for other solgel-derived silicon-oxo coatings produced at low drying temperatures.

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Solvent-Free One-Pot Synthesis of high performance silica/epoxy nanocomposites

Cited by 27 publications

References 17 publications

Synthesis and characterization of nanosilica/waterborne polyurethane end‐capped by alkoxysilane via a sol‐gel process

Synthesis and characterization of nanosilica/waterborne polyurethane end‐capped by alkoxysilane via a sol‐gel process

Physical study of room‐temperature‐cured epoxy/thermally reduced graphene oxides with various contents of oxygen‐containing groups

Preparation of tough silicon-oxo coatings with enhanced hardness from moisture-curable polysiloxane and silica alcosol

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