Comparative studies on corrosion protection properties of polyimide‐silica and polyimide‐clay composite materials

Abstract

Comparative studies on corrosion protection properties of polyimide-silica-clay composites were studied in this article. A series of polyimide-silica (PIS), polyimide-clay (PIC), and polyimide-silica-clay composites (PISC) materials, consisting of an organo-soluble polyimide (ODA-BSAA) matrix, inorganic silica particles prepared through the sol-gel reaction of tetraethyl orthosilicate (TEOS) and dispersed nanolayers of inorganic montmorillonite clay, were successfully prepared by solution dispersion technique. Then, all samples were characterized by FTIR, powder X-ray diffraction patterns, transmission electron microscopy, and 29 Si solid-state NMR. The main focus of this article is the comparison of the corrosion protection properties of PIS, PIC, and PISC composite materials. Normally, the aspect ratio of clay is higher than silica. Superior dispersion of clay platelets into a polymer matrix may effectively increase the length of diffusion pathways for oxygen and water. The effects of the materials composition on the corrosion protection performance, gas barrier, and optical properties, in the form of both coating and film, were also studied by electrochemical corrosion measurements (e.g., corrosion potential, polarization resistance, corrosion current, and impedance spectroscopy), gas permeability analysis, and UV-visible transmission spectroscopy.

Preparation, microstructure, mechanical, and thermal properties of in situ polymerized polyimide/organically modified sericite mica composites

“…The intense peak at near 1020 cm −1 and the two bands at 472 and 529 cm −1 are assigned to SiO bonds' stretching and SiO bonds' bending, respectively for both samples . While the characteristic absorption bands of HSE are displayed at 2921 and 2851 cm −1 for CH stretching vibration, 1470 cm −1 for CN stretching .…”

Polymer nanocomposite coatings

“…For example, Yeh and co-workers demonstrated that the incorporation of organophilic clay platelets into a polymer matrix, in the form of organic-based coatings, may effectively enhance the corrosion protection of polymers on metallic surfaces. [27][28][29][30][31][32][33][34][35][36][37][38] This is because of the good dispersion (intercalation and exfoliation, Fig. 18.2 ) of the plate-like clay platelets in the polymer matrix, which effectively increase the length of the diffusion pathways for oxygen and water.…”

Transparency anticorrosion coatings prepared from alumina-covered graphene oxide/polyimide nanocomposites

“…Therefore, it is reasonable to assume that increasing the difficulty of the diffusion pathway will effectively prevent H 2 O and O 2 from accessing the substrate surface, leading to good anticorrosion properties of the coating. Recently, many studies have shown that nanofiller can effectively enhance the barrier properties of various polymers [14,[43][44][45][46]. This is because their morphologies have high aspect ratios that lengthen the diffusion pathways for moisture or oxygen, leading to improved barrier properties [47,48].…”