Ex situ IR and Raman spectroscopy as a tool for studying the anticorrosion processes in (3-glycidoxypropyl)trimethoxysilane-based sol–gel coatings

Rauter, Aleksander; Perše, Lidija Slemenik; Orel, B.; Bengű, Başak; Sunetci, Onder; Vuk, Angela Šurca

doi:10.1016/j.jelechem.2013.05.015

Cited by 19 publications

(12 citation statements)

References 48 publications

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“…The formation of a siloxane network is evident from the two characteristic absorption bands at 1114 and 1043 cm -1 , which are assigned to the asymmetric Si-O-Si stretching mode. These two distinct bands are often ascribed to the formation of three-dimensional siloxane polymers made up of T units [RSiO 1.5 ] x [37][38][39]. The vibration band at 782 cm -1 is assigned to the Si-O-Si symmetric stretch [40].…”

Section: Ftir Studiesmentioning

confidence: 99%

Novel organic–inorganic hybrid materials based on epoxy-functionalized silanes

Sitthiracha

Kilmartin

Edmonds

2015

J Sol-Gel Sci Technol

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Hybrid materials comprising inorganic glasses and organic polymers were investigated as potential replacements for diglycidyl ether of bisphenol-A to improve the thermomechanical properties of available composites. An epoxy-functionalized silane, 3-glycidoxypropyltrimethoxysilane (GPTMS), was employed to synthesize organic-inorganic hybrid materials (OIHMs) via a sol-gel process. The oxirane ring in GPTMS was cross-linked by compounds including an aliphatic amine, diethylenetriamine, amine-functionalized silane, n-(2-aminoethyl)-3-aminopropyltrimethoxysilane, tertiary amine, 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30), and an acid anhydride, hexahydrophthalic anhydride. OIHMs derived from a difunctional organosilane, (3-glycidoxypropyl)methyldimethoxysilane, were also synthesized to compare the mechanical properties with OIHMs derived from GPTMS. Structural characterization of cured OIHMs was performed using a combination of attenuated total reflectance spectroscopy (FTIR-ATR) and 29 Si solid-state nuclear magnetic resonance. Differential scanning calorimetry and thermogravimetric analysis were used to clarify the thermal properties. The thermomechanical properties and cross-link density were evaluated using dynamic mechanical thermal analysis (DMTA). In this study, it was evident that the presence of inorganic networks provided a significant improvement of the thermomechanical properties, where the glass transition temperature typically increases by 20°C and the storage modulus at 150°C by nearly eight times that of neat epoxy resin. An increase in glass transition temperature, end-use temperature, and the thermomechanical behavior of OIHMs was observed and quantified using DMTA. These results corresponded to calculated increases in cross-link density.

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Section: Ftir Studiesmentioning

confidence: 99%

Novel organic–inorganic hybrid materials based on epoxy-functionalized silanes

Sitthiracha

Kilmartin

Edmonds

2015

J Sol-Gel Sci Technol

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“…Consequently, the assignment of the LO modes in IR RA spectra of MPTMS protective coatings can be carried out on the basis of previously developed knowledge on trialkoxysilanes. [13,[14][15][16] The eventual changes in topography of the MPTMS coatings during the corrosion process can be effectively monitored using in situ electrochemical atomic force microscopy (AFM). [17,18] AFM enables the investigation of conductive and non-conductive surfaces, which is a great advantage when studying corrosion processes.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopical and Electrochemical Characterisation of a (3-Mercaptopropyl)trimethoxysilane - Based Protective Coating on Aluminium Alloy 2024

et al. 2017

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Coatings based on organic-inorganic hybrids may effectively improve the resistance of metals/alloys against corrosion. In this work the protection ability of a coating based on (3-mercaptopropyl)trimethoxysilane (MPTMS) deposited on the well-known aluminium AA 2024 alloy is studied. The hydrolysis and condensation reactions in the initial sol and the structure of thermally treated protective MPTMS coatings is studied using infrared absorbance spectroscopy. In addition, the structure of coatings is investigated using infrared reflection-absorption (IR RA) spectroscopy. Several physical properties of prepared coatings such as contact angles, surface energy and thickness are reported. The corrosion protection ability of once, twice and three times deposited MPTMS coatings is studied using potentiodynamic polarisation measurements. Finally, possible morphological changes at different potentials of interest are investigated using in situ electrochemical AFM.

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“…to influence the hydrophobicity of the coatings, the poly(dimethylsiloxane) (PDMS)-based protective coatings for AA 2024 have already been prepared and reported. For example, aminopropyl terminated poly(dimethylsiloxane) was crosslinked via reaction with epoxy groups of 3-glycidoxypropyltrimethoxysilane [26][27][28]. On the other side, when alkoxy terminal groups were attached on PDMS polymer chain to obtain a novel hybrid bis end-capped sol-gel precursor [24], crosslinking reactions occurred solely via sol-gel processes of hydrolysis and condensation [29].…”

Section: Introductionmentioning

confidence: 99%

“…They can be used as polydentate hybrid cross-linkers for various coating systems. POSS have already been used in various polymeric [35][36][37] and sol-gel [4,28,38] systems due to their positive influence on thermal, chemical and scratching resistance of the formed final materials. For example, the increase in thermal stability has been confirmed for PDMS composites with octavinyl-POSS [39] and poly(phenylsilsesquioxane) [40].…”

Section: Introductionmentioning

confidence: 99%