Product Name: 4-Phenylethynylphthalic Anhydride
Aliases: 4-PEPA; 5-(Phenylethynyl)isobenzofuran-1,3-dione; 5-(Phenylethynyl)-1,3-isobenzofurandione; 4-(Phenylethynyl)-1,2-benzenedicarboxylic anhydride; Phenylethynylphthalic Anhydride
Molecular Formula: C₁₆H₈O₃
Molecular Weight: 248.24 g/mol
Physical State (20°C): Solid, appearing as light yellow to off-white crystalline powder
Melting Point: 152°C (Typical)
Boiling Point: Approximately 466.9±28.0 °C (Predicted)
Density: 1.38±0.1 g/cm³ (Predicted)
Solubility: Almost insoluble in water; soluble in organic solvents such as ethanol, dimethylformamide (DMF), dichloromethane, and acetone
Stability: Stable under normal temperature and pressure; should be protected from strong light and moisture
Storage Conditions: Store in a cool, dry and sealed container, preferably under inert atmosphere (such as argon); avoid contact with strong oxidants and strong bases
Purity: Typically ≥98% (HPLC or GC)
Appearance: High-purity products are light yellow to off-white crystalline powder with uniform particle size and no visible impurities
It is a key intermediate and end-capping reagent for polyimide synthesis and modification, widely used in the preparation of high-performance polyimide materials.
It is applied in the production of crosslinked polyimides; the diphenylacetylene end-capping moiety undergoes thermally induced radical curing, which significantly improves the thermal stability of polyimides (T₅% = 591.3 °C).
It is used in the manufacturing of gas separation membranes; modified polymer membranes containing this product show improved gas permeability.
It is applied in the aerospace field as a raw material for heat-resistant materials, due to the excellent high-temperature stability of the polyimides synthesized from it.
It serves as an important building block in organic synthesis, used for the preparation of fine chemicals, pharmaceutical intermediates, and advanced functional materials.
It is used in the research and development of high-performance polymers, providing a key functional group for polymer modification and performance optimization.
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