Nanoparticles of niobium oxyhydroxide incorporated in different polymers for photocatalytic degradation of dye

Waterborne polyurethane dispersions based on polypropylene glycol/polycarbonate diol: Evaluation of their use as wood protective coatings

“…They correspond to the carbonyl vibration stretching ( C O) (band I); the sum of the vibrations δN H + νC N + νC C (band II); the stretching vibration C N (band III) and the N H bending vibrations (band IV), respectively. 17 In order to evaluate the individual contributions of vibrations associated with the C O polycarbonate structure and urethane groups, the deconvolution by Gaussians and mathematical adjustment procedures were performed, Figure 2. Table 3 shows the areas under Gaussian curves, after the deconvolution, associated with the C O stretching from the PC structure (carbonate, A 1 ).…”

“…19,20 The WPUs were characterized by the ratio R BCOT (A BCO /A FCO ), shown in Table 4, referring to a sum of the areas of the bonded carbonyl (A BCO ) groups and free carbonyls (A FCO ) of urethane and urea groups. 17 The R BNHT value indicated the content of the bond N H groups. They would be associated with other oxygenated or nitrogenated groups of the hard segment or carbonate/hydroxyl groups linkage in the soft segments.…”

“…In general, the typical polyurethane bands were identified at 1760–1600 cm −1 , ~1540 cm −1 , 1292–1226 cm −1, and ~ 722 cm −1 , here, denominated bands I, II, III, and IV. They correspond to the carbonyl vibration stretching (CO) (band I); the sum of the vibrations δNH + νCN + νCC (band II); the stretching vibration CN (band III) and the NH bending vibrations (band IV), respectively 17 …”

“…The carbonyl band corresponds to a sum of the carbonyl group absorptions, which can be free or bonded by hydrogen interactions; bonded groups absorb at lower wavenumbers than no bound groups 19,20 . The WPUs were characterized by the ratio R BCOT (A BCO /A FCO ), shown in Table 4, referring to a sum of the areas of the bonded carbonyl (A BCO ) groups and free carbonyls (A FCO ) of urethane and urea groups 17 …”

Plasma‐assisted synthesis and deposition of molybdenum oxide nanoparticles on polyethylene terephthalate for photocatalytic degradation of rhodamine B

“…[29] It should be noted that polymer film substrates with deposited nanoparticles are often used as catalysts. [30,31] The characteristics of the polymers such as chemical inertness, high durability, inexpensive and readily available, and high ultraviolet (UV) resistance make them suitable to be used as a substrate for photocatalysts. At present, photocatalytically active composite polymer materials with titanium oxide nanoparticles have been prepared.…”