The effect of TiO 2 as a pigment in a polyurethane/polysiloxane hybrid coating/aluminum interface based on damage evolution

Organic-Inorganic Hybrid Coatings for Corrosion Protection of Metallic Surfaces

“…EIS measurements confirmed the high-corrosion protection efficiency with an impedance modulus of more than 10 GΩ cm 2 , decreasing one decade after 90 days of immersion in 3.5% NaCl solution. Visuet et al [9] obtained similar results for polyurethane/polysiloxane hybrid coatings containing TiO 2 as pigment. The EIS analysis showed that coatings loaded with 10-wt% TiO 2 (75 μm thick) were able to withstand 263 days, in 3.5% NaCl solution, with almost unaltered corrosion resistance of about 100 GΩ cm 2 .…”

“…Very promising results were also achieved for PMMA-silica coatings [8,10,31], with the highest observed durability of more than 560 days in 3.5% NaCl, and for hybrids containing reinforcement and inhibitor agents [11,18]. Moreover, for some polyurethane-silica and polyurethane-zirconia-silica systems, it has been demonstrated that they also have a high potential to be used as efficient anticorrosive barrier layers [9,32].…”

Nanocomposite materials for photocatalytic degradation of pollutants

“…However, the design of nanocomposites based on photocatalytically active polymers needs to take into account that the organic component can undergo to photocatalytic degradation process [116][117][118], therefore a compromise is required between a reasonable degree of photocatalytic activity and an acceptable stability of the polymer matrix [20,119]. For this reason perfluorinated polymers and hybrid inorganic-organic sol-gel materials such as organo-silane are the most promising host matrices for the preparation of photocatalytic nanocomposites [29,120].…”

“…Therefore, the design and implementation of novel TiO 2 -based catalysts deposited onto suitable substrates is a challenging task in order to obtain materials exploitable for environmental applications. A way to reduce the aggregation of the catalysts and increase the mechanical stability of the coatings is their integration in polymer/inorganic hybrids, to achieve a functional nanocomposite [13,14,[17][18][19][20][21]. A nanocomposite is defined as a multiphase solid material where one of the phases has at least one dimension lower than 100 nm.…”

Preparation of uniform poly(urea–siloxane) microspheres through precipitation polymerization

“…The strong stretching vibration peaks for N-H at 3360 cm -1 , C=O at 1654 cm -1 , C-N at 1240 cm -1 and plane banding vibration of N-H at 1550 cm -1 , confirm the formation of polyurea groups (-NH-CO-NH-). [51][52][53] The C=O and N-H observed at 1654 and 3360 cm −1 , respectively, suggest that the solid product was connected by disordered hydrogen bonding between the active hydrogen atoms of the two urea donor groups (N-H) in one urea molecule and an acceptor oxygen of the carbonyl group (C=O) in another urea molecule, but not the free urea (1690 cm −1 ) or ordered hydrogen bonding (1630 cm −1 ). 54,55 Compared with S0P10 ( Fig.…”