Hyperbranched Rigid Aromatic Phosphorus‐Containing Flame Retardants
The synthesis of DOPO-HQ has been described previously, [ 35] and it has been used in several synthesis routes as a flame retardant, [ 36, 37] also for epoxy resins. [ 38 - 40] Specimens for reaction-to-small-flame tests and for the forced-flaming-combustion test were prepared, and the flame retardancy performance was assessed for different fire
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.
An overview of some recent advances in DOPO-derivatives: Chemistry and
These DOPO-derivatives are used as flame retardants mainly in epoxy resins [3], [5], [11], [12], [13], [15], for applications in adhesives, composites, printed wiring boards and others [17]. As some halogenated flame retardants have been found to be toxic, the research on halogen-free flame retardants is gaining more and more importance [18].
Flame retardant effect and mechanism of a novel DOPO based tetrazole
A novel highly efficient flame retardant with phosphaphenanthrene group and tetrazole ring, 6-(((1H-tetrazol-5-yl)amino)(4-hydroxyphenyl)methyl)dibenzo[c,e][1,2]oxaphosphinine 6-oxide (ATZ), was synthesized and incorporated into epoxy matrix as co-curing agent to remarkably improve the flame retardancy of epoxy resin.
Molecular Firefighting—How Modern Phosphorus
DOPO was the first efficient halogen-free FR for epoxy resins based on novolac and gained much attention because of its high thermal stability, high reactivity of its PH bond, and flame-retarding efficiency. 56 Scheme 2 Open in figure viewer PowerPoint FR-functionalized novolac resin for further use in epoxy resins. 55
- 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].
- What are reactive Dopo based flame retardants for epoxy resins?
- This review focuses on recent advances in reactive DOPO–based flame retardants for epoxy resins, including reactive monomers, curing agents and hybrid structures. There are also highlighted fire retardant mechanisms of the DOPO derivatives and thermal and mechanical features of the epoxy systems.
- Are phosphorus flame retardants halogen-free?
- Flame retardants containing phosphorus seem to offer a promising halogen-free way to render epoxy resins and their composites flame retardant in the future , .
- 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 halogen based flame retardant is used in epoxy resins?
- Until recently, the majority of the flame retardants were halogen based and the most widely used one in epoxy resins for EE applications is the reactive tetrabromobisphenol A (TBBPA, Figure 5).
- 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.
