Efficient Flame Retardancy, Smoke Suppression, and Mechanical Enhancement of β‐FeOOH@Metallo‐Supramolecular Polymer Core–Shell Nanorod Modified Epoxy Resin

Abstract

A metallo-supramolecular polymer poly{4-(((3,4-dihydroxyphenyl) (6-oxidodibenzo[c,e][1,2]oxaphosphinin-6-yl)methyl)amino)phenyl-2,2-dimethylbutanoate} (HP) is synthesized through a Kabachnik-Fields reaction. Then HP is coated on the surface of β-FeOOH by coordination interaction to generate organic-inorganic hybrid β-FeOOH@HP (Fe@P) nanorods, which are used for preparing flame retardant epoxy resin (EP) nanocomposites. The structure of HP is characterized by nuclear magnetic resonance and fourier transform infrared spectroscopy, the morphology and composition of β-FeOOH and Fe@P nanorods are also studied by scanning electron micrograph and transmission electron microscope instruments. With the presence of 2 wt% of Fe@P, the limiting oxygen index value of EP nanocomposite increased to 32.8% with UL-94 vertical burning V-1 rating, and 31.4% of flexural strength enhancement, indicating the improvement of both flame retardant and mechanical properties with low loading amount. The reduction of total smoke production, average CO and CO 2 yield for EP nanocomposites with 0.5 wt% of Fe@P reflected the good smoke suppression. The flame retardant mechanism of Fe@P is also discussed.

Photosensitive Benzoxazines Derived from Divanillidene Cyclopentanone/Cyclohexanone for Hydrophobic and Optical Applications

“…Non‐halogenated polymer systems are typically have LOI values over the threshold of 26, attempting to exhibit self‐extinguishing features. [ 30 ] According to TGA data, all of the synthesized polybenzoxazines in the current work have LOI values that are higher than the threshold value of 26 and they display strong self‐extinguishing characteristics with excellent thermal stability.…”

Sesamol-based polybenzoxazines for ultra-low-k, high-k and hydrophobic coating applications

“…Furthermore, the values of the LOI were also ascertained for the flame retardant behaviour of the neat sesamol-based polybenzoxazines and composites. Using the char yield value, the LOI value of the neat polybenzoxazine and composites were calculated using the van Krevelen and Hoftyzer equation: 63–65 LOI = 17.5 + 0.4 ( σ )where σ is the percentage char yield of the remains of polymeric materials at 850 °C. The poly(S-a), poly(S-dde), poly(S-ddm), and poly(S-ffa)benzoxazines, as well as the (3-glycidyloxypropyl)trimethoxysilane (GPTMS) functionalized bio-silica and GCN-c reinforced benzoxazine composites, possessed excellent thermal stability compared to that of other synthesised polybenzoxazines, which showed that LOI values were higher than that of the threshold value of 26, which supports a good flame retardant property.…”

Metal–Organic Frameworks Derived from Zn and p‐Hydroxybenzoic Acid for Smoke Suppression and Flame Retardation in Vinyl Resin

“…[39,40] Transition metal elements such as Fe, Cu, and Zn were found to improve smoke suppression and reduce the smoke toxicity of resins. [41][42][43][44] In particular, nanomaterials with Zn as the metal source showed excellent characteristics, such as non-mobility, piezoelectricity, and environmental friendliness. Further, they have been widely used in optoelectronic devices, solar cells, and biosensors.…”