Epoxy resin DER 671X75 cured with hardener T31. Epoxy polymer composite materials DER 671X75/T31 were improved the mechanical properties, thermal stability by triphenyl phosphate (TPP) and nanosilica (fumed silica S5505). Triphenyl phosphate and nanosilica were dispersed in epoxy resin DER 671X75 by mechanical stirring and ultrasonic vibration. The structural morphology of materials was characterized by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The thermal stability and thermal properties of materials were characterized by Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The results showed that triphenyl phosphate with a content of 5 wt % in epoxy resin DER 671X75 improved the mechanical properties of epoxy polymer coating film DER 671X75/T31 with an impact strength increased 25%. The contents of 5 wt % triphenyl phosphate and 1 wt % nanosilica in epoxy resin DER 671X75 improved the impact strength of epoxy polymer coating film DER 671X75/T31 by 125%. The thermal stability of epoxy nanocomposite materials DER 671X75/5% triphenyl phosphate/1% nanosilica/T31 increased 45.35%. Epoxy coatings based on epoxy resin DER 671X75/5% triphenyl phosphate/1% nanosilica/pigments/fillers/additives/hardener T31 achieved mechanical properties, physical chemistry properties for coating and, had thermal degradation over 500 °C.

This study reports the ability of zinc borate (ZB) and nano silica (NS) in improving mechanical properties and thermal behavior of nanocomposites and coatings composed of epoxy resin EPIKOTE 1001 × 75 cured with hardener T31. The properties of the fabricated nanocomposites were characterized using scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, derivative thermogravimetry, differential scanning calorimetry, and dynamic mechanical analysis. With the addition content of 5 wt % ZB into epoxy resin (EPIKOTE 1001 × 75/T31/ZB-5), the impact strength of the fabricated epoxy polymer film increased by 50%, and the glass transition temperature (T g) increased from 52 to 71 °C. By adding the content of 5 wt % ZB and 1 wt % NS into epoxy resin (EPIKOTE 1001 × 75/T31/ZB-5/NS-1), the impact strength of the formed epoxy nanocomposite films increased by 137.5%, and T g increased from 52 to 82 °C. The results showed that 5 wt % ZB, 1 wt % NS, and hardener T31 improved the toughness and mechanical properties of epoxy polymer materials. The thermal stability of epoxy composite EPIKOTE 1001 × 75/T31/ZB-5 increased by 1.9% and that of epoxy nanocomposite EPIKOTE 1001 × 75/T31/ZB-5/NS-1 increased by 4.7%. The epoxy coating based on epoxy resin EPIKOTE 1001 × 75/T31/ZB-5/NS-1 achieved mechanical properties and had the strongest decomposition temperature at 642 °C.

The surface of nano silica (NS) was modified by [3- (2-Aminoethyl) aminopropyl] trimethoxy silane (KH-792) to increase surface activity. Evaluate the efficiency of grafting [3- (2-Aminoethyl) aminopropyl] trimethoxy silane (KH-792) into NS was characterized by Fourier Transform Infrared Spectrometry (FTIR) and Thermo Gravimetric Analysis (TGA). NS and modified nano silica (m-NS) were dispersed into epoxy resin Epon 1001X75 by mechanical stirring and ultrasonic vibration. Epoxy resin Epon 1001X75 was cured with Epikure 3125 (Epi3125). The structural morphology and dynamic mechanical properties of materials were characterized by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Dynamic Mechanical Analysis (DMA). The results showed that NS was modified with the content of 20 wt% KH-792 for the highest denaturation efficiency. With adding the content of 1 wt% NS (NS-1), the mechanical properties of epoxy polymer film Epon 1001X75/Epi3125/NS-1 increased the impact strength from 20kG.cm to 52.5 kG.cm (increased by 162.5 %). Adding the content of 2 wt% m-NS (m-NS-2) improved the impact strength of epoxy polymer film Epon 1001X75/Epi3125/m-NS-2 from 20 kG.cm to 55 kG.cm (increased by 175 %). The glass transition temperature (Tg) of epoxy polymer composites Epon 1001X75/Epi3125, Epon 1001X75/Epi3125/NS-1, and Epon 1001X75/Epi3125/m-NS-2 gradually increased by 48oC, 75oC, and 79oC. The obtained results showed that m-NS with KH-792 increased the mechanical properties of epoxy polymer film Epon 1001X75/Epi3125.

Flake micaceous iron oxide (MIO) pigment is a natural flake pigment, together with nano silica (NS) used to increase mechanical properties and corrosion resistance of coatings based on epoxy resin Epotec YD011X75 cured with Domide G5022. MIO and NS were dispersed into epoxy resin Epotec YD011X75 by mechanical stirring combined with ultrasonic vibration. The structural morphology of the materials was characterized by Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), and Transmission Electron Microscopy (TEM). Functional groups in epoxy/curing agent/MIO polymers analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The thermal property of the material is evaluated by Thermogravimetric and Differential Scanning Calorimetry (TG-DSC). Epoxy coatings with flake micaceous oxide iron, nano silica, phosphate zinc pigment (P), talc filler powder (T), additives, and solvents are prepared by grinding and mechanical stirring. The mechanical properties of epoxy coatings were evaluated by standards for epoxy coatings. The anti-corrosion properties of the coatings on steel were evaluated by the salt fog spray method and electrochemical method. The research results have fabricated two formulations of epoxy coatings based on epoxy resin Epotec YD011X75 with the most appropriate mass ratio of YD011X75/(MIO/P/T) is 40/60 (wt/wt); of which one does not have nano silica (epoxy coating MIO2); one with 1 wt% nano silica (epoxy coating MIO5). The thermal stability of epoxy coating MIO5 is better than epoxy coating MIO2. The decomposition temperature of 50 wt% of epoxy coatings MIO5 and MIO2 is 528.34°C and 470.53°C. The formed epoxy coatings achieve the physical chemistry properties, mechanical properties, and corrosion resistance properties of steel for epoxy coatings, in which the epoxy coating MIO5 is better than the epoxy coating MIO2.

This study presents synthesis results of catalysts made of perovskite-like oxide La2-xSrxCuO4 (x=0.0, 0.5, 1.0) using the citrate method and crystallisation at 800°C. The structure of the catalysts was characterised by X-ray diffraction (XRD). The perovskite-like oxide catalyst activity was enhanced with gold (Au) and platinum (Pt). Au was mounted on the perovskite-like oxide catalysts by the sol-gel method. The activity of the perovskite-like oxide La2-xSrxCuO4 (x=0.0, 0.5, 1.0) and the perovskite catalyst LaMnO3/LaCuO3 was evaluated by complete oxidation of volatile hydrocarbons (HCs) in a mixture of toluene and methyl ethyl ketone (MEK) and carbon monoxide (CO) in a microflow analysis system combined with gas chromatography. The results showed that the light-off temperature (the 50% conversion temperature of the catalysts) of the Pt, Au/perovskite catalyst samples decreased significantly. The light-off temperature of the Au/LaSrCuO4 Au nanoparticle catalysts in the complete CO oxidation reaction reached a temperature of 150°C, lower than the Pt/LaSrCuO4 catalyst (170°C), allowing replacement of previous Pt catalysts with Au nanoparticle catalysts. The LaSrCuO4 catalyst had better oxidising activities than the La2CuO4 catalyst, indicating that the addition of strontium (Sr) has increased the catalyst activity, and demonstrates the potential for application in catalytic converters in motorcycles.