Characterization of protective performance of epoxy reinforced with nanometer-sized TiO2 and SiO2

Shi, Hongwei; Liu, Fuchun; Lin-yuan, Yang; Han, En‐Hou

doi:10.1016/j.porgcoat.2007.11.003

Cited by 196 publications

(84 citation statements)

References 17 publications

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“…14 This increase in corrosion resistance may also be attributed to interactions between the nano-silica particles and the appropriate silane groups, producing a network structure by crosslinking and therefore increasing the path of molecules or ions transporting through the new framework structure. 24 It is interesting to note that 8% hydrophilic nanosilica also performs very well in terms of coating resistance. The quasi-network structure of hydrophilic nano-silica may slow down the diffusion rate of corrosive species.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

“…20 Nano-coatings that contain silica show remarkable barrier properties against gases and moisture, as well as very good resistance to staining. [21][22][23][24][25] Various electrochemical techniques have been used for evaluating the performance of organic coating/ metal systems. 26 One is electrochemical impedance spectroscopy (EIS), which is a nondestructive test method.…”

Section: Introductionmentioning

confidence: 99%

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Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat

et al. 2009

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Two different types of nano-silica (i.e., hydrophilic Aerosil 200 and hydrophobic Aerosil R805) were employed in the preparation of 2-pack acrylic polyol polyurethane nano-coatings so that the electrochemical properties of the resultant coatings could be investigated. Electrochemical impedance spectroscopy was used to evaluate the corrosion performances of such nano-coatings applied onto mild steel substrates that were immersed in 3.5% (w/w) NaCl solutions. It was observed coatings that contained nanosilica increased the barrier properties of the binder, as well as the coatings' electrochemical resistance compared with pure polyurethane coatings. The surface tension of pure polyurethane was measured by a tensiometer. Rheological properties were also determined at various shear rates by a rotaviscometer. Results showed that the surface tension of hydrophobic nanosilica is very close to the pure polyurethane matrix, giving the better compatibility of the two. This was further confirmed by transmission electron microscopy and by the fact that the hydrophobically filled nano-silica coatings showed shear thinning behavior in the fluid state. Also observed was better corrosion performance of the resultant hydrophobic nano-coatings compared to coatings embedded with hydrophilic nano-silica.

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Section: Electrochemical Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat

et al. 2009

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“…The polymer-silica combination shows enhanced thermal, mechanical, and chemical properties compared to the neat organic matrix (Ref [8][9][10][11][12][13]. Lu et al reported that tensile strength and elastic modulus of silica-epoxy nanocomposites produced by sol-gel process are increased by 94 and 75%, respectively, at silica particle loading of 3 wt.% in comparison to those of the neat resin ( Ref 14).…”

Section: Introductionmentioning

confidence: 99%

Studies on Thermal and Mechanical Properties of Epoxy-Silicon Oxide Hybrid Materials

Ghosh

Kumar

2015

J. of Materi Eng and Perform

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Ultrasonic dual mixing (UDM) process involving ultrasonic vibration with simultaneous stirring is used to prepare epoxy-silicon oxide hybrid materials with inorganic nanoscale building blocks by incorporating nanoscale silicon oxide network in epoxy matrix. The silicon oxide network is obtained from tetraethoxysilane (TEOS) by using the in situ sol-gel process. Same epoxy-silica hybrid materials were also prepared by mixing with simple impeller stirring, and its properties were compared with the material of same composition prepared by the UDM process. The epoxy-silicon oxide hybrid materials are characterized by using FT-IR, DSC, FESEM, and XRD techniques. The glass transition temperature, tensile strength, and elastic modulus of the epoxy-silicon oxide hybrid materials treated by UDM process are found comparatively better than those of the materials processed by a rotating impeller. FESEM studies confirm that amount of TEOS varies the distribution and size of silicon oxide network, which remains relatively finer at lower content of TEOS. Significant improvement of thermal and mechanical properties of the neat epoxy is noted in the presence of 3.05 wt.% TEOS content in it is giving rise to the formation of inorganic building block of silicon oxide of size 88 ± 45 nm in the matrix. In this regard, the use of UDM process is found superior to mixing by simple impeller stirring for enhancement of properties of epoxy-silicon oxide hybrid materials. Lowering of properties of the epoxy-silicon oxide hybrid materials with TEOS addition beyond 3.05 wt.% up to 6.1 wt.% occurs primarily due to increase of amount and size (up to 170 ± 82 nm) of the inorganic building block in the matrix.

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“…It has been demonstrated that surface modification of inorganic NPs by such silane coupling agents improved the dispersion of NPs in polar polymers. [10,12,13] However, the polar functional groups of these silane agents are not well compatible with PP. The interfacial interaction between such silane-modified NPs and PP would not be good enough to produce well-dispersed PP nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Dispersibility of silane‐functionalized alumina nanoparticles in syndiotactic polypropylene

Truong

Larsen

Holme

et al. 2010

Surface & Interface Analysis

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The dispersibility of silane-functionalized alumina nanoparticles (NPs) in syndiotactic polypropylene (sPP) was investigated. The Al 2 O 3 NP surface was modified with two different silane coupling agents, (3-chloropropyl)triethoxysilane and (octyl)triethoxysilane, to create hydrocarbon groups, or their halogen derivatives, for the enhanced hydrophobic interaction with the sPP matrix. Transmission electron microscopy studies showed that the presence of hydrophobic groups improved the dispersibility of alumina NPs in the sPP matrix. A good dispersibility was found in both (3-chloropropyl)triethoxysilane-modified Al 2 O 3 /sPP nanocomposites and (octyl)triethoxysilane-modified Al 2 O 3 /sPP nanocomposites.

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Characterization of protective performance of epoxy reinforced with nanometer-sized TiO2 and SiO2

Cited by 196 publications

References 17 publications

Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat

Investigating changes in electrochemical properties when nano-silica is incorporated into an acrylic-based polyurethane clearcoat

Studies on Thermal and Mechanical Properties of Epoxy-Silicon Oxide Hybrid Materials

Dispersibility of silane‐functionalized alumina nanoparticles in syndiotactic polypropylene

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