Hydrophobic, UV resistant and dielectric polyurethane-nanolignin composites with good reprocessability

Polyurethane-Nanolignin Composite Foam Coated with Propolis as a Platform for Wound Dressing: Synthesis and Characterization

“…Furthermore, hydrogen bonds are formed between hydroxyl groups of NL and N-H (proton donors) and C=O (proton acceptors) in the urethane group (–NHCOO–) in PU-NL. From this result, it can be suggested that NL was well miscible in a matrix of PU foam at a molecular level [ 23 , 25 ].…”

“…Many researches have been explored the use of lignin in developing polyurethane foams [ 21 , 22 ], but there is no report on PU nanocomposite foams including NL. More particularly, although previous reports show the application of NL as additive in PU to develop advanced polymer nanocomposites [ 23 , 24 ], to the best of our knowledge, there is no evidence using such nanoparticles in PU nanocomposite foams. In addition, from the application perspective, only two pieces of research reported lignin being incorporated into commercial PU for tissue engineering and wound dressing purposes [ 25 , 26 ].…”

Innovative Sustainable Wood Preservatives From Pulp and Paper Industry Byproduct

“…It has been reported that lignin nanocapsules would have enhanced radical scavenging activity compared to the raw lignin molecule [148]. The radical scavenging activity (Figure 4.5) gives an indication of the anti-oxidative capacity of propiconazole, and the various individual lignin-based treatments.…”

“…The anti-radical activity of lignin is related to its anti-microbial activity, a higher antiradical activity results in a higher anti-microbial activity [146]. Lourencon et al observed a higher ratio of syringyl to guaiacyl, and higher anti-oxidant activity for hardwood kraft lignin samples recovered at lower pH [147], and the anti-radical properties of lignin have been reported to be enhanced in nanoparticle form [148]. Klein et al reported higher antioxidant activity for kraft lignin in comparison to organosolv lignin [149].…”

“…In this work, the inherent ability of lignin to act as radical scavenger is being exploited [232]. This property is enhanced in nanomaterials compared to the raw molecule [148]. In this work, this property is used for the purpose of creating a dual action, anti-fungal system.…”