Effect of Different Flame-Retardant Bridged DOPO Derivatives on
The production of sustainable and effective flame retardant (FR) polyamide 6 (PA6) fibrous materials requires the establishment of a novel approach for the production of polyamide 6/FR nanodispersed systems. This research work explores the influence of three different flame-retardant bridged 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivatives on the comprehensive properties
Mechanical, Thermal Stability, and Flame Retarding Properties
When the amount of DOPO-POSS is 9 wt %, the residual char of DOPO-POSS/FRPET at 700 °C increases to 23.56 from 18.16% of FRPET, and the maximum thermal weight loss rate also reduces. What is more is that the limiting oxygen index increases to 33 from 26% of FRPET.
Frontiers | Functionalized CNTs with DOPO and Silicon Containing Agents
Among the phosphorus based flame retardants, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and its derivative have attracted great attention in the field of flame retardant due to their high flame retardant efficiency to polymer materials and high thermal stability (Perret et al., 2011; Salmeia. et al., 2015).
Synthesis of a novel flame retardant based on DOPO derivatives and its
An intumescent flame retardant (DOPO-DAM) containing phosphorus and nitrogen was synthesized via a two-step process and then, it was incorporated into waterborne polyurethane to serve as a reactive flame retardant for preparing flame-retarded WPU (FR-WPU). The chemical structures of DOPO-DAM and FR-WPU were confirm
DOPO/Silicon/CNT Nanohybrid Flame Retardants: Toward Improving
The thermal stability and flame-retardant properties of EP/FR-CNTs composites are improved, which is attributed to the good dispersion of DOPO/silicon/CNT nanohybrid. The cone calorimeter results demonstrate that FR-CNTs can reduce peak heat release and the release of toxic gas effectively compared with EP/CNTs and EP/CNT/FR composites.
- 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.
- 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 EAD a flame retardant?
- Multifunctional-efficient flame retardant EAD was designed for epoxy resin. 0.186 wt% P-loading endowed EP with UL-94 V-0 rating and good thermal stability. Thermosets exhibited improvement in tensile strength and impact resistance. DOPO-conjugated structure gave EP transparency and UV-shielding performance.
- How does Dopo exhibit a flame retardant mechanism?
- DOPO exhibits mainly gas phase flame retardant mechanism through the release of free radical scavangers generated during material combustion. It may also exhibit condensed phase by dehydration to form carbonaceous protective layers .
- Can EAD be used as a flame retardant for epoxy resin?
- Furthermore, the incorporation of EAD also endowed epoxy resin with good transparency and UV-shielding performance. As a whole, EAD can be used as a multifunctional flame retardant for epoxy resin, and this work may propose a potential direction for the development of high-efficient flame retardant in the future.
- How do flame retardants affect the flammability of epoxy resin?
- The flame retardants with both phosphate and epoxy rings which formed chemical bonding with the modified epoxy resin led to the lowering of thermal degradation rate and temperature onset. The structure of the modifier also significantly influenced the flammability of the epoxy materials.
