Introduction to BPDA Chemical Name: 3,3′,4,4′-Biphenyltetracarboxylic dianhydride Molecular Formula: C₁₆H₆O₆ Molecular Weight: 294.22 CAS Number: 2420-87-3 BPDA is an aromatic tetracarboxylic dianhydride compound , and one of the most important dianhydride monomers for synthesizing high-performance polyimides (PI) . Due to its rigid biphenyl structure and symmetric molecular backbone, BPDA significantly enhances the thermal stability, mechanical strength, and chemical resistance of polyimide materials. Consequently, it is widely used in aerospace, electronics, electrical insulation, and flexible display technologies . 1. Chemical Structure and Characteristics BPDA consists of two benzene rings linked by a carbon–carbon bond, with carboxylic anhydride groups attached at the 3,3′,4,4′ positions. This planar, highly conjugated, and rigid molecular architecture gives BPDA-based polyimides their exceptional properties: Excellent thermal stabil...