Interplay of Hydrophobic Thiol and Polar Epoxy Silicate Groups on Microstructural Development in Low-Alcohol, Crosslinked Sol–Gel Coatings for Corrosion Prevention
| Autor: | Shegufa Shetranjiwalla, Andrew J. Vreugdenhil, Oliver K.L. Strong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology engineering.material 010402 general chemistry organic–inorganic hybrids 01 natural sciences Corrosion Coating X-ray photoelectron spectroscopy hydrophobic coatings Materials Chemistry Fourier transform infrared spectroscopy Sol-gel chemistry.chemical_classification epoxy–thiol silicates Surfaces and Interfaces Epoxy low-volatile organic content 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films sol–gel chemistry Chemical engineering lcsh:TA1-2040 visual_art anti-corrosive coatings visual_art.visual_art_medium engineering Thiol 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) Stoichiometry |
| Zdroj: | Coatings Volume 11 Issue 3 Coatings, Vol 11, Iss 306, p 306 (2021) |
| ISSN: | 2079-6412 |
| DOI: | 10.3390/coatings11030306 |
| Popis: | We have demonstrated that our patented, crosslinked, sol–gel, epoxy–thiol silicates made from the combination of (a) tetraethoxysilane (TEOS, T), 3-glycidoxypropyltrimethoxysilane (GPTMS, G), and the (b) sulfur-containing 3-mercaptopropyltrimethoxysilane (MPTMS, S) with TEOS in a 1:1 stoichiometric ratio form the 1:1 TGST (crosslinked epoxy and thiol silicates) coating, which can be successfully utilized for the corrosion protection of low-carbon steel. Alcohols that are a by-product of sol–gel reactions influence the network formation, crosslinking density, and formulation stability, are volatile organic contents, and are regulated in the coatings industry. To improve environmental sustainability, a series of low-alcohol (LA) formulations with TG:ST ratios of 3:1 to 1:3 was prepared to investigate the microstructural development and crosslinking reactions emerging from the interplay of the hydrophobic thiol and polar epoxy silicates induced by the low-alcohol environment. The impact on crosslinking density was characterized by Fourier Transform Infrared (FTIR), Raman, XPS, viscosity, and pot-life measurements. Low-alcohol TGST (LA(TGST)) formulations were compared, using the example of 1:1 TGST, to corresponding TGST formulations where alcohols were retained. The reduced impact of LA(TGST) formulations on global warming was quantified. The glossy and scratch-resistant LA(TGST) coatings showed 71% enhanced corrosion protection compared to the non-crosslinked hybrids. |
| Databáze: | OpenAIRE |
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