Facile synthesis of epoxy nanocomposite coatings using inorganic nanoparticles for enhanced thermo-mechanical properties: a comparative study

Khan, Rawaiz; Azhar, Muhammad Rizwan; Anis, Arfat; Alam, Mohammad Asif; Boumaza, M.; Al‐Zahrani, Saeed M.

doi:10.1007/s11998-015-9736-6

Cited by 32 publications

(16 citation statements)

References 51 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this sense, the addition of 1 wt.% of SiO 2 led to a maximum Tg ~ 59 °C. Similar results were obtained by Rawaiz Khan et al with the incorporation of 2 wt.% of SiO 2 into an epoxy resin [ 50 ]. After the weathering test ( Figure 4 b and Table 1 b), less ordered composites were obtained.…”

Section: Resultssupporting

confidence: 88%

“…Before the weathering test, the incorporation of different NPs promoted a more ordered composite and higher Tg 1 values ( Figure 4 a), following the order: Tg SiO2-S10-1 (58.6 °C) > Tg SMNC-S10-1 (57.6 °C) > Tg AC-S10-1 (56.9 °C) > Tg ZnO-S10-1 (56.8 °C) > Tg S10-1 . This increment in the Tg could be attributed to the limited mobility of the epoxy chains due to the intense interactions between the NPs and the epoxy resin [ 50 , 51 ]. In this sense, the addition of 1 wt.% of SiO 2 led to a maximum Tg ~ 59 °C.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

et al. 2021

View full text Add to dashboard Cite

Epoxy resin coatings are commonly used to protect concrete structures due to their excellent chemical corrosion resistance and strong adhesion capacity. However, these coatings are susceptible to damage by surface abrasion and long-term contact with marine climate conditions, deteriorating their appearance and performance. This study aims to optimize the performance of cement-based epoxy resin coatings, bisphenol-A and polyol, in aggressive environments by functionalizing the selected systems with different nanoparticles such as activated carbon, surface modified nanoclay, silica and zinc oxide. Nanomodified coatings were applied to concrete specimens and subjected to three weeks in a spray salt chamber and three weeks in a QUV chamber. They were found to present improved thermal resistance and curing degree after the weathering test. Their water permeability, adhesion, and abrasion resistance properties were evaluated before and after this test. The results showed that the nature of the nanocomposites determined their water permeability; the bare resin presented the worst result. Additionally, nanomodified composites with activated carbon and silica showed the best adherence and abrasion resistance properties, due to the effect of this aging test on their thermal stability and curing degree.

show abstract

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Figure 7 exhibits the average nano-hardness and elastic modulus values measured for cured pristine (C0.0) and S-rGO reinforced nanocomposites (C0.5, C1.0, C2.0, C4.0). The modulus and nano-hardness were is acquired using the previously mentioned Oliver–Pharr method [ 45 ] and the unloading curve, as given in the following Equations (3) and (4) [ 14 , 46 ].

where E is the modulus of the sample,

is the Poisson’s ratio normal to loading of the sample, E i is the elastic modulus of the indenter,

is the indenter Poisson’s ratio no., dp / dh is contact stiffness (S) in which p represents the unloading force and h is the corresponding indentation depth and A is the contact area.…”

Section: Resultsmentioning

confidence: 99%

“…Its high hardness and lower price compared to other fillers make it an ideal filler [ 12 ]. However, the particles tendency towards agglomeration restricts its concentration in the matrix [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Synergic Potential of rGO/SiO2 as Hybrid Filler for BisGMA/TEGDMA Dental Composites

et al. 2020

Self Cite

View full text Add to dashboard Cite

Graphene and graphene oxide based nanomaterials have attained immense significance in research because of their matchless physiochemical characteristics. Although potential biomedical applications of graphene have been extensively studied, however, dentistry related applications were rarely explored. This study aimed to investigate the effect of various percentages of surface modified reduce graphene oxide (S-rGO) in combination with SiO2 nanoparticles (bulk filler) on numerous physio-mechanical characteristics of acrylate-based (BisGMA/TEGDMA: 1:1 by wt.) composites. BisGMA/TEGDMA reinforced with 30 wt.% surface modified fumed-silica (S-A200) was considered as control group (base composite). Various concentrations (0, 0.5, 1, 2, 4 wt.%) of S-rGO were incorporated into the base composite via solution casting and high-speed mixing. The obtained composites were characterized for rheological properties before curing by using Rheometer (Anton Paar, USA) in the oscillatory mode under a frequency sweep over a range of angular frequency of 0.1–100 rad/s at 25 °C. The degree of conversion (DC) was measured by using Fourier transform infrared spectroscopy (FTIR). A Nano-indentation test was carried out to obtain nano-hardness and elastic modulus. The surface roughness was measured by optical microscope (Bruker®), 3D non-contact surface profilometer. The structural and morphological properties were studied by using Scanning Electron Microscopy (SEM). The mean and standard deviation were calculated and a simple mean comparisons test was performed for comparison using SPSS. The results revealed that the addition of a tiny proportion of S-rGO considerably increased the nano-indentation hardness, elastic modulus and DC. Conversely, a gradual reduction in viscosity was observed with increasing S-rGO concentration. The study demonstrates that a small fraction of S-rGO in combination with SiO2 could enhance physical, mechanical and rheological properties of acrylate based composites. Thus S-rGO/SiO2 combination could be used as a potential hybrid filler for dental nanocomposites.

show abstract

“…The amount of char yields or residues at 650 • C was increased from 6.15 to 12.50 wt.%. This is due to, the use of NPs can lead to the formation of a barrier which can prevent the evolution of volatiles during the degradation and thus increases the amount of char that was produced [36]. DMA measurements of the cured epoxy in the presence of different weight ratios of ZrO2/Cr2O3 NPs were represented in Figure 6.…”

Section: Surface Morphology and Thermal Characteristics Of Zro2/cr2o3mentioning

confidence: 99%

Hybrid ZrO2/Cr2O3 Epoxy Nanocomposites as Organic Coatings for Steel

et al. 2020

View full text Add to dashboard Cite

Mixed ZrO2 and Cr2O3 nanoparticles (NPs) were prepared using a liquid phase chemical technique and applied as reinforced filler for epoxy coatings with different weight ratios ranged from 0.5 to 2.5 wt.% to protect carbon steel from corrosion. The ZrO2/Cr2O3 NPs were used to catalyze the curing of the epoxy composite films to modify their mechanical and thermal characteristics on the steel surface. The crystalline structure, particle sizes, and surface morphologies of the prepared ZrO2 and Cr2O3 NPs were characterized to investigate their chemical composition and dispersion. The thermal stability of epoxy ZrO2/Cr2O3 coating films was investigated by thermogravimetric analysis (TGA), and the mechanical properties of the cured epoxy films were also studied. The dispersion of the Cr2O3/ZrO2 NPs into the epoxy matrix was investigated by scanning electron microscope (SEM), dynamic mechanical analysis (DMA) and TGA analyses. The results of salt spray test, used to investigate the anticorrosion performance of the epoxy coatings) were combined with thermal characteristics to confirm that the addition of Cr2O3/ZrO2 NPs significantly improved the corrosion resistance and the thermal stability of epoxy coating. The mechanical properties, adhesion, hardness, impact strength, flexibility and abrasion resistance were also improved with the addition of ZrO2/Cr2O3 NPs filler content.

show abstract

Facile synthesis of epoxy nanocomposite coatings using inorganic nanoparticles for enhanced thermo-mechanical properties: a comparative study

Cited by 32 publications

References 51 publications

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

Long-Term Performance of Nanomodified Coated Concrete Structures under Hostile Marine Climate Conditions

Evaluation of Synergic Potential of rGO/SiO2 as Hybrid Filler for BisGMA/TEGDMA Dental Composites

Hybrid ZrO2/Cr2O3 Epoxy Nanocomposites as Organic Coatings for Steel

Contact Info

Product

Resources

About