Pyromellitic Dianhydride (PMDA)

Pyromellitic Dianhydride (PMDA) is a highly reactive aromatic dianhydride widely recognized as a key monomer in the production of high-performance polyimide polymers. This versatile organic compound features two anhydride groups attached to a benzene ring, providing exceptional thermal stability, mechanical strength, and chemical resistance.

Technical Specifications

Packaging and Storage

• 25kgs Paper drum packaging, lined with PE bags, outer aluminum foil bags two layers of sealed packaging.

• Keep container tightly closed in a dry and well-ventilated place.

Key Properties of Pyromellitic Dianhydride (PMDA)

• Solubility: Soluble in polar solvents like dimethyl sulfoxide (DMSO), dimethylformamide (DMF), and acetone; insoluble in ether, chloroform, and benzene

• Hygroscopic Nature: Rapidly absorbs moisture from humid air, hydrolyzing into pyromellitic acid

• Reactivity: Highly reactive upon melting, making it ideal for polymerization and curing processes

• Thermal Stability: Enables materials with high glass transition temperatures (Tg up to 300°C or higher in cured systems)

Primary Applications of Pyromellitic Dianhydride (PMDA)

Pyromellitic Dianhydride (PMDA) is essential in advanced materials manufacturing due to its ability to impart superior heat resistance, flame retardancy, and durability:

Polyimide Resins and Films: 

Core monomer for synthesizing polyimides used in flexible printed circuits, aerospace components, insulation films, and high-temperature electronics.

Epoxy Resin Curing Agent: 

Acts as a crosslinking and curing agent for epoxy systems, enhancing mechanical strength, chemical resistance, and thermal performance in adhesives, coatings, composites, and electrical encapsulation.

High-Performance Coatings and Adhesives: 

Improves oxidative stability and mechanical properties in protective coatings for industrial and automotive applications.

Thermoplastics and Plasticizers: 

Used in producing polyesters, polyethers, polycarbonates, and engineering plastics with excellent flame retardancy.

Other Uses: 

Chain extender in polyethylene terephthalate (PET), matting agent in powders, and stabilizer in specialized resins.

These applications make PMDA indispensable in industries like aerospace, electronics, automotive, and microelectronics, where materials must withstand extreme temperatures and harsh environments.

Frequently Asked Questions (FAQs)

Q: What are the main uses of PMDA?

A: It is widely used in polyimide films for electronics and aerospace, epoxy curing for high-performance adhesives and coatings, and as a crosslinking agent in thermoplastics.

Q: Is PMDA hygroscopic?

A: Yes, PMDA rapidly absorbs moisture from the air and hydrolyzes into pyromellitic acid.  Always store in sealed containers in dry conditions.

Q: What is the melting point of PMDA?

A: The melting point ranges from 284-288°C, contributing to its high thermal stability in applications.

Q: How should PMDA be stored?

A: Store in a cool, dry place in tightly closed containers, protected from humidity and incompatible substances.

Q: What solvents dissolve PMDA?

A: It is soluble in DMSO, DMF, and acetone but insoluble in ether, chloroform, and benzene.

Q: Is PMDA suitable for epoxy resin curing?

A: Yes, it serves as an effective curing agent, often requiring pre-dissolution in acetone or fine dispersion due to its high melting point.

Q: What industries commonly use PMDA?

A: Aerospace (for heat-resistant films), electronics (insulation and circuits), automotive (high-temperature parts), and coatings/adhesives sectors.

Contact Us

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Email: mandy@aozunchem.com

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