The role of quinoid derivatives in the UV-initiated synergistic interaction mechanism of HALS and phenolic antioxidants

Aromatic Amide-Based Hindered Amine Derivative as an Efficient Nucleation Agent for Polypropylene within Antiaging and Rechargeable Antibacterial Performances

“…The 1 H NMR spectrum of NBT displayed peaks at δ = 1−1.5 ppm from the alkyl group's H peak, δ = 4.3 ppm from the amino hydrogen peak on the piperidine ring, δ = 7.7 ppm from the hydrogen atom on the benzene ring, and 8.3 ppm from the hydrogen on the amide group. Additionally, the 13 C NMR spectrum of NBT showed peaks assigned to seven distinct chemically surrounded carbons labeled numerically (29.15, 35.08, 44.63, 50.94, 127.56, 137.35, and 165.28 ppm). These peaks together confirm the presence of various functional groups and the molecular structure of NBT, which confirms the successful synthesis of NBT (Figure 1).…”

“…Furthermore, polypropylene's intrinsic vulnerability to degradation caused by the presence of reactive tertiary carbon atoms, which are prone to photoinduced decomposition, can result in progressive material degradation, evidenced by discoloration, cracking, and the development of powdery residues. 13,14 The inherent vulnerability weakens PP's mechanical strength and overall durability, rendering it unsuitable for environments that require ultraviolet (UV) sterilization, like hospitals and related facilities. 15,16 Therefore, it is essential to integrate stabilizers, specifically those with photostabilizing properties, into polypropylene formulations to effectively combat these degrading effects and thereby prolong the service life of the finished products.…”

“…Among these, low-cost and efficacious nucleating agents, whether organic (e.g., fatty acids, amides, sodium alkylbenzenesulfonate) or inorganic (like silica, calcium carbonate, calcium silicate), are commonly used. − These agents significantly enhance PP’s processability and mechanical properties, allowing manufacturers to create lighter, thinner materials without compromising strength or key features. Furthermore, polypropylene’s intrinsic vulnerability to degradation caused by the presence of reactive tertiary carbon atoms, which are prone to photoinduced decomposition, can result in progressive material degradation, evidenced by discoloration, cracking, and the development of powdery residues. , The inherent vulnerability weakens PP’s mechanical strength and overall durability, rendering it unsuitable for environments that require ultraviolet (UV) sterilization, like hospitals and related facilities. , Therefore, it is essential to integrate stabilizers, specifically those with photostabilizing properties, into polypropylene formulations to effectively combat these degrading effects and thereby prolong the service life of the finished products. , …”

Co-intercalated layered double hydroxides as thermal and photo-oxidation stabilizers for polypropylene

“…Polypropylene (PP) protected with the prepared MP-Ca 2 Al-LDH exhibited enhanced thermal stability and anti-migration behavior in comparison with MP-Ca/PP composites. Lately, some studies have demonstrated much better performance of multi-component intercalation compounds compared to the corresponding single-component intercalation compounds as well as to the physical mixtures of the components [18–19]. The benefit of the co-intercalation is attributed to synergistic effects between the different active species associated to a higher dispersion in the composites [20–21].…”