2,6,7-Trioxa-1-phosphabicyclo2.2.2octane-4-methanol, 1-oxide

🔬 Physical and Chemical Properties

Appearance: Typically white or off-white crystalline powder.

Solubility: Soluble in polar solvents such as water, methanol, ethanol, dimethylformamide (DMF), and dimethyl sulfoxide (DMSO). Insoluble or poorly soluble in non-polar solvents (e.g., toluene, n-hexane). Its water solubility is a major advantage as a reactive flame retardant.

Characteristics:

High Phosphorus Content: Phosphorus content reaches ~15.8%, meaning effective flame retardancy can be achieved with lower addition levels.

Rigid Cage Structure: The bicyclic cage structure confers high thermal stability and rigidity, contributing to increased polymer glass transition temperature and dimensional stability.

Active functional groups: Terminal -CH₂OH (hydroxymethyl) groups enable covalent bonding to polymer chains through chemical reactions (e.g., esterification, etherification, condensation), integrating it as a polymer component.

⚙️Primary Application Areas

The core value of PEPA-OH lies in its role as a “reactive” flame retardant monomer. It does not function as a simple additive but is permanently incorporated into the polymer matrix through chemical reactions.

Reactive Flame Retardant Modification of Polymeric Materials

Polyester (PET, PBT): PEPA-OH structures are incorporated into polyester molecular chains through copolymerization with dicarboxylic acids (or esters), producing inherently flame-retardant polyesters. Widely used in flame-retardant fibers, engineering plastics, and films.

Polyurethane (PU): As a polyol component, it reacts with isocyanates to produce inherently flame-retardant polyurethane foams, elastomers, coatings, and adhesives.

Epoxy Resins: It can function as a curing agent or modifier, participating in the curing network of epoxy resins to impart excellent flame retardancy, high Tg, and good mechanical properties to the cured material. Used in high-end electronic packaging materials and composites.

Acrylic Resin: Its hydroxymethyl groups react with acrylic (ester) to form phosphorus-containing acrylic monomers, which polymerize into flame-retardant coatings, adhesives, etc.

Essential synthetic monomers for intrinsically flame-retardant polymers

Serves as a key intermediate for synthesizing a series of novel phosphorus (phosphine)-containing ester polymers, used to prepare specialty engineering plastics with high thermal stability, low smoke emission, and low toxicity.

🎨Flame Retardant Mechanism

The flame retardant effect of PEPA-OH is primarily achieved through the following synergistic mechanisms:

Condensation-phase flame retardancy: During combustion, polymers containing PEPA structures decompose to form phosphoric acid or polyphosphoric acid compounds. These promote carbonization on the polymer surface, forming a dense, heat-insulating char layer that isolates oxygen and heat.

Gas-Phase Flame Retardation: Decomposition generates phosphorus-containing radicals (e.g., PO·), which capture high-energy H· and OH· radicals in the combustion chain reaction, interrupting flame propagation.

Thermal Stability: Its rigid structure elevates the material’s thermal decomposition temperature, delaying the thermal decomposition process.

5. Advantages over Additive-Type Flame Retardants
Durability: Chemically bonded, it does not migrate, volatilize, or leach out, ensuring long-lasting flame retardancy.

Excellent Compatibility: As an integral part of the polymer chain, it is fully compatible with the matrix, preserving material transparency, mechanical properties, and processability.

Environmental Friendliness: Eliminates potential environmental and health risks associated with small-molecule additive flame retardants.

📦Storage and Precautions

Storage: Keep sealed in a cool, dry, well-ventilated area to prevent moisture absorption.

Stability: Structurally stable, but due to its hydroxyl group content, avoid contact with strong oxidizing agents, strong acids, and strong bases.

Safety: As a chemical, it may cause irritation to eyes, skin, and respiratory tract. Wear protective equipment during handling and operate within a fume hood.

📩 Contact Information

For pricing, samples, technical data, or customized specifications, please contact:

●Product Manager:Lucy Yao

Email:  lucy@coreychem.com