New Findings Reported from
The news correspondents obtained a quote from the research, "The assigned materials were modified molecules made of DGEBA and 3-aminopropyl triethoxylsilane (APTES), in which the molar ratio of epoxide group of DGEBA to NH- of APTES varied in the order of 2:1, 4:1, 8:1 and 16:1. In the next stage, the APTES-modified DGEBA precursors were added to different amounts of pre-hydrolyzed TEOS, i.e. 7.5, 12.5 and 17.5 wt%, as inorganic part of the resulting hybrid. The mixtures were subsequently cured at room temperature by a cycloaliphatic amine based curing agent to yield transparent epoxy-silica hybrid coatings. Microstructure assessment of the hybrid materials, before and after curing, was performed using FTIR and Si-29 NMR spectroscopies. The morphology of the epoxy-silica hybrid coatings has also been studied by scanning electron microscopy (SEM). The anticorrosive measurements on the resultant coatings were conducted based on electrochemical impedance spectroscopy (EIS). The mechanical properties evaluation such as micro-hardness measurements and pull-off adhesion tests of the cured samples were also carried out. The thermal properties of the cured hybrid coatings were evaluated using thermogravimetric analysis (TGA). The results showed that the concentration of APTES and pre-hydrolyzed TEOS play an important role in determining the morphology as well as the mechanical and thermal properties of coatings."
According to the news reporters, the research concluded: "The EIS results corresponding to these effects reaffirmed that the corrosion resistance of the hybrid coatings improved with increasing the inorganic phase content."
For more information on this research see: Anti-corrosion hybrid coatings based on epoxy-silica nano-composites: Toward relationship between the morphology and EIS data. Progress in
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