Introduction In the development and application of next-generation high-performance polyimide (PI) materials , DMCBDA (Dimethyl-cyclobutane-1,2,3,4-tetracarboxylic dianhydride) has gained increasing attention as a critical dianhydride monomer. With its unique molecular structure, DMCBDA not only enhances the optical transparency of polyimides but also effectively reduces their dielectric constant, thereby meeting the high-performance requirements of flexible electronics, 5G/6G communications, and advanced optical devices . Key Parameters of DMCBDA Parameter Value / Characteristics Chemical Name Dimethyl-cyclobutane-1,2,3,4-tetracarboxylic dianhydride Molecular Formula C₁₀H₈O₆ Molecular Weight 224.17 g/mol Appearance White to off-white solid powder Melting Point ~220–230 °C Purity ≥99% (industrial/electronic grade) Features Methyl substitution enhances transparency, lowers dielectric constant, and reduces water absorption Functions of DMCBDA 1. Enhancing Optical Transparency...