3,3',4,4'-Biphenyltetracarboxylic dianhydride (BPDA) CAS 2420-87-3

Synonyms: s-BPDA; 4,4'-Biphthalic dianhydride; 4,4'-Biphthalic Anhydride; Diphenyl-3,3',4,4'-tetracarboxylic Dianhydride; [5,5'-Biisobenzofuran]-1,1',3,3'-tetrone; 3,3',4,4'-Biphenyltetracarboxylic acid dianhydride

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Product Details

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3,3',4,4'-Biphenyltetracarboxylic dianhydride (BPDA, CAS 2420-87-3) is an aromatic dianhydride primarily used as a monomer in the synthesis of high-performance polyimides and related polymers, offering exceptional thermal stability, low coefficient of thermal expansion (CTE), high mechanical strength, tensile modulus, electrical insulation, and heat resistance.

Basic Information of BPDA

Product Name	3,3',4,4'-Biphenyltetracarboxylic dianhydride
Abbreviation	BPDA
CAS Number	2420-87-3
Molecular Formula	C16H6O6
Molecular Weight	294.22 g/mol
Appearance	Off-white powder to crystal
Purity	≥99.5%
Package	1kg/bottle, 20kg/drum, or customized
Molecular formula

Key Properties

Excellent thermal stability and rigidity from aromatic biphenyl structure
Carbonyl / keto linkages introduce spacing, improving solubility / processability in polymer precursors
Symmetric structure helps in obtaining high molecular weight polyimides with balanced mechanical properties
Well-established monomer in PI / CPI / flexible electronics / insulating applications

Key Applications of BPDA

Electronics and Microelectronics: Employed in polyimide resins for super-engineering plastics in mobile phones, copying machines, and high-frequency components like 5G signal transmitters; also used in flexible printed circuit boards (PCBs) to prevent delamination due to matched CTE with copper, and in advanced semiconductor packaging for reliability under high temperatures.

Display Technologies: Utilized in flexible displays, leveraging thermal stability and mechanical properties for foldable and wearable devices.

Fibers and Textiles: Applied in the synthesis of high molecular weight aromatic polyamide fibers with high strength, modulus, temperature resistance, and radiation resistance.

Nanocomposites and Advanced Materials: Incorporated into polyimide/organic clay nanocomposites for superior tensile and thermal properties, hybrid nanocomposite films, and hyper-cross-linked polymers for dye wastewater purification.

Separation and Environmental Technologies: Used in fibrous membrane scaffolds for oil-water separation and in polymers for environmental applications like wastewater treatment.

Other Industrial Uses: Serves as a pharmaceutical intermediate and in the production of homo- and copolyimides for various high-performance applications

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