Improving Thermal and Flame Retardant Properties of Epoxy Resin with Organic NiFe‐Layered Double Hydroxide‐Carbon Nanotubes Hybrids

Abstract

Organic nickel‐iron layered double hydroxides (ONiFe‐LDH) were assembled on carboxylated carbon nanotubes (CNTs) through co‐precipitation method and characterized. EP/ONiFe‐LDH‐CNTs nanocomposites containing 4 wt% of ONiFe‐LDH‐CNTs with different ratios of ONiFe‐LDH and CNTS were prepared by ultrasonic dispersion and program temperature curing method. Strong combination of the above nanofillers with the EP matrix provided an efficient thermal and flame retardant improvement for the resulting nanocomposites. It is showed that EP containing 4 wt% ONiFe‐LDH‐CNTs hybrid exhibited superior flame retardant and thermal properties compared with pure EP.

Nanocarbon-Based Flame Retardant Polymer Nanocomposites

“…The dispersion of layered double hydroxides and the carbonization performance of matrix materials can be improved by their hybridization. The results show that the heat release rate and the smoke release rate of composites with only 4 wt% nano fillers had greatly decreased [84]. Multi-walled carbon nanotubes (MWC-NTs) were treated with phosphoric acid, and phosphorus was introduced onto the surface of the CNTs to prepare a new type of phosphorus carbon nanotube (P-MWCNT) flame retardant.…”

Intumescent-Grafted Bamboo Charcoal: A Natural Nontoxic Fire-Retardant Filler for Polylactic Acid (PLA) Composites

“…Carbon-based agents such as carbon nanotubes (CNTs) and expanded graphite (EG) are considered to be excellent flame-retardant fillers by forming dense networks, but these are costly. , Therefore, cheaper sources such as bamboo charcoal (BC) have also been investigated as flame-retardant additives for PLA . Functional flame retardants based on the chemical graft-modification of BC are in development, , and BC is considered to have significant potential in flame retardancy. , From previous research, − BC has much better compatibility and compounding capacity with polymers than powdered bamboo (bamboo flour), which requires chemical modification (by alkali treatment or adding coupling agents) to prevent phase separation. , Significant chemical functionalization is required to impart the flame-retardant capability to bamboo flour. , Bamboo has tiny, complex pores, and the controlled pyrolysis and grinding process for BC give it greater specific surface area and a rich, irregular pore structure, potentially allowing it to become better integrated with graft products and the polymer matrix. , Interaction of BC with the polymer interface has been shown to increase the crystallinity of the matrix by promoting heterogeneous nucleation and enhancing certain properties of the material, such as stiffness and rigidity. , Using BC with a small particle size as a reinforcing agent in PLA, Ho et al successfully created BC/PLA composites whose maximum tensile strength, flexural strength, and ductility index (DI) were increased by 43, 99, and 52%, respectively.…”

“…27 Carbon-based agents such as carbon nanotubes (CNTs) and expanded graphite (EG) are considered to be excellent flameretardant fillers by forming dense networks, but these are costly. 28,29 Therefore, cheaper sources such as bamboo charcoal (BC) have also been investigated as flame-retardant additives for PLA. 30 Functional flame retardants based on the chemical graftmodification of BC are in development, 31,32 and BC is considered to have significant potential in flame retardancy.…”

Effect of Graphene Oxide–Modified Cobalt Nickel Phosphate on Flame Retardancy of Epoxy Resin

“…Epoxy resin (EP) is well known for its excellent mechanical and chemical properties and has been used in various fields such as electronics and insulating materials. (Kong et al, 2017a;Li et al, 2018;Ding et al, 2020;Nie et al, 2020). However, its severe flammability with toxic gases and smoke during combustion limits its wide application (Zhang et al, 2018;Kong et al, 2019c;Yang et al, 2019).…”