Aliphatic polyurethane–montmorillonite nanocomposite coatings: Preparation, characterization, and anticorrosive properties

Abstract

Polyurethane (PU)-clay nanocomposite coatings were prepared by a sonication method. The stability and morphology of these coatings was characterized by turbidometry, X-ray diffraction, and transmission electron microscopy. The anticorrosive properties of these coatings were investigated by salt-spray and electrochemical impedance spectroscopy methods. According to the results, dispersed nanoclay layers in the matrix of the nanocomposite coating compositions led to superior anticorrosive characteristics compared to those of pure PU coatings. The best results were obtained with coatings containing about 5 wt % clay. The resistance of the coating containing 5% clay was about 9.002 GX after 225 days of immersion in a 3.5 wt % NaCl solution, whereas it was only 97 kX for the pure PU coating.

Effects of organically modified nanoclay particles on the mechanical properties of aliphatic polyurethane/clay nanocomposite coatings

“…There are a number of potential improvements due to inclusion of layered silicates in polymers such as increase in modulus, toughness, barrier properties, flame retardancy, dimensional and thermal stability [11][12][13][14][15][16][17][18]. All the results illustrate that in order to achieve the best possible properties of polymerclay nanocomposites, obtaining a stable dispersion in which the silicate nanolayers are completely exfoliated in the polymeric matrix is a crucial consideration; therefore, during nanocomposite preparation, the evaluation and assessment of the morphology of these nanocomposites is of great importance [19][20][21][22][23][24][25][26][27]. Nano clay particles attributable to their extreme large surface-area/particle-size ratio tend to strongly agglomerate, so there have been many researches for agglomeration reduction by surface modification of nanoparticles [28][29][30][31].…”

Temperature dependence of hydrogen bond in Fe‐OCAP/polyurethane blends

“…Polyurethane (PU) has a wide range of applications as coatings, adhesives, fibers, foams, thermoplastic elastomers, etc . The modification of PU for improved physical and chemical properties is of great interest among researchers .…”

Thermal Properties of Fe-octacarboxyl Acid Phthalocyanine/Polyurethane Blends

“…[1][2][3][4][5] The thermal stability of PU significantly influences its applications as engineering materials. [6] In recent years, considerable attention has been devoted to study the thermal stability of PU.…”