Kinetic Evaluation of 9,10-dihydro-9-oxa-10
In this investigation the flame-retardant effect of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) on an epoxy resin (EP) was studied. The results showed that the peak of heat release rate (PHRR) and total heat release (THR) of EP/DOPO (FREP) with 5phr DOPO during cone calorimeter measurements were only 67.4% and 75.3% of those of
Phosphorus Containing Polyacrylamides as Flame Retardants
Abstract. Novel polymeric flame retardants based on two acrylamides and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) or 5,5-dimethyl- [1,3,2]dioxaphosphinane-2-oxide (DDPO) are described for several applications in HexFlow RTM6, a high-performance epoxy resin. Neat resin samples and carbon fiber-reinforced composites were tested
Investigation on the Flame Retardant Properties and Fracture
In this study, the flame-retardant, thermal and mechanical properties of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and nano-SiO 2 modified epoxy novolac resin is evaluated, and the combinational effects of both additives are verified. As a hardener, an isophorone diamine (IPDA) and polyetheramine blend is stoichiometrically
Flame Retardancy and Thermal Degradation Behaviors of Thiol
In our previous research, silicone flame retardant was added to thiol-ene polymer and achieved good flame retardant effect, while DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), another common organophosphorus flame retardant, was also demonstrated to effectively enhance the flame retardancy of the materials [18,19].
Highly Effective P–P Synergy of a Novel DOPO-Based Flame
A novel flame retardant (FR) DOPO-PEPA, which was synthesized via Atherton–Todd reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclo[2.2.2]octane (PEPA), was used as an additive-type FR in epoxy resin (EP). The results of the limiting oxygen index (LOI), vertical burning test, and cone calorimeter test indicated
- 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.
- Is Dopo a flame retardant?
- 9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) is a commercial flame retardant used in many polymers. [8, 9] By grafting N-containing groups on the active P-H group [10 - 16] on DOPO molecules, many DOPO derivatives were designed, when P and N existed simultaneously in EP, the flame-retardant efficiency was significantly improved.
- Does TDCA-Dopo improve the flame retardancy of epoxy composites?
- As expected, the addition of the DOPO-based derivatives significantly improved the flame retardancy of the resulting epoxy composites. Specifically, the LOI of EP/TDCA-DOPO-1, EP/TDCA-DOPO-2 and EP/TDCA-DOPO-3 increased to 30.5%, 33.0% and 31.5%, respectively, from 27.0% for the unmodified EP.
- What is a reactive flame retardant (BPD) for epoxy resin?
- Huo et al. synthesized a reactive flame retardant (BPD) for epoxy resin (EP) through a 1–pot reaction (Fig. 7). BPD contained phosphorus, nitrogen and sulfur and was used as co–curing agent for DGEBA together with DDM (Table 2). Fig. 7. Synthesis of BPD (yield 85 %) . Table 2. Composition of the cured EP systems .
- 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.
- Is Teba a flame retardant resin?
- In a recent study, Chi et al. reported the obtaining of a flame retardant bio–based epoxy resin (TEBA) (yield 91 %) synthesized in three stages from DOPO, diethanolamine and diphenolic acid (Fig. 16). TEBA cured with DDM (TEBA–DDM) was compared with a standard DGEBA–DDM.
