A DOPO-based phosphorus-nitrogen flame retardant bio-based epoxy resin
In this work, a DOPO-based phosphorus-nitrogen flame retardant bio-based epoxy resin from diphenolic acid had been developed. The phosphorus-nitrogen structure is grafted in the epoxy resin main chain, which is different from the direct addition type and co-curing agent type flame retardant system.
High performance flame-retardant organic–inorganic hybrid epoxy
In recent years, as a substitute for halogen flame retardants, DOPO and its derivatives have exhibited remarkable achievements for halogen-free flame-retarded epoxy resin. 6–10 However, the weak bond of phosphorus-containing groups that introduced into the epoxy matrix reduces the crosslinking density and consequently brings negative effects on thermal and mechanical properties of cured
An overview of some recent advances in DOPO-derivatives: Chemistry and
Compound 13a was designed to be a building unit as a hardener and flame retardant for epoxy resin [37]. Owing to the positive effect of the aromatic group on the flame retardancy and thermal properties, 13b was also designed as an example of DOPO-derivative with higher content of aromatic groups (Fig. 4) [37]. Download : Download full-size image
Recyclable Flame-retardant Epoxy Composites Based on Disulfide Bonds
Then phosphorus-containing compounds would be a good choice to act as flame retardant for epoxy. Both flame retardancy and recyclability are important properties for epoxy resins. Herein, this work aims to fabricate a kind of recyclable flame-retardant epoxy, keeping balance of excellent flame retardancy and recyclability. Friendly DOPO is used
Biobased Epoxy Composites Reinforced with Acetylated Corn Straw
A novel phosphorus-contg. compd. (DOPO-THPO) is synthesized via the Atherton-Todd-reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and trihydroxymethylphosphine oxide (THPO), and then employed as flame retardant for diglycidyl ether of bisphenol A/4-4 diaminodiphenylmethane epoxy resin (DGEBA/DDM).
- Are Dopo-based derivatives a flame retardant for epoxy resins?
- In summary, the DOPO-based derivatives enhanced the fire retarding performance of epoxy by gas phase-condensed phase flame-retardant mechanism. In conclusion, three kinds of DOPO-based derivatives with multiple phosphorous oxidation states were synthesized and applied as flame retardants for epoxy resins.
- Are phosphorous oxidation states a flame retardant for epoxy resins?
- In conclusion, three kinds of DOPO-based derivatives with multiple phosphorous oxidation states were synthesized and applied as flame retardants for epoxy resins. FTIR and NMR spectra confirmed the successful synthesis of these DOPO-based derivatives.
- Which is the best flame retardant for epoxy resin?
- Among them, 9,10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide (DOPO) has become the most widely studied and most promising flame retardant in the field of flame retardant epoxy resin [31, 32].DOPO and its derivatives can be used as reactive and additive flame retardants in epoxy resins.
- Is Dopo a flame retardant?
- DOPO contains a reactive hydrogen bond which reacts easily with epoxy resins, aldehydes, acrylates, activated double bonds of benzoquinone, making it either a good flame retardant additive precursor or an integrative flame retardant . Hence, hydrogen phosphinates or phosphonates may be attached directly to an epoxy resin.
- Are epoxy resins flammable?
- Unfortunately, epoxy resins have the disadvantage of being highly flammable and thus require suitable modifications with reactive or non-reactive flame retardant additives. Recent literature have shown that the derivatives 9,10–dihydro–9–oxa–10–phosphaphenanthrene–10–oxide (DOPO) are the most researched flame retardants for epoxy resins.
- Are phosphorus-containing compounds halogen-free flame retardants for epoxy resins?
- Phosphorus-containing compounds, as one of the most important halogen-free flame retardants for epoxy resins, have received widespread interest owing to their relatively environmental friendliness and high flame-retarding efficiency [11, 12].
