2,3,3′,4′-BiphenyLtetracarboxylic dianhydride (α-BPDA)

Basic Information of α-BPDA

Product Name	2,3,3',4'-Biphenyltetracarboxylic dianhydride
Abbreviation	α-BPDA
CAS Number	36978-41-3
Product Type	Asymmetric aromatic dianhydride monomer
Molecular Formula	C16H6O6
Molecular Weight	294.22 g/mol
Appearance	Off-white powder
Purity	≥ 99.9%
Loss on Drying	≤ 0.5%
Main Application	Optical, transparent and high-performance polyimide synthesis
Package	1 kg/bottle, 20 kg/drum, or customized packaging
Documents	COA, SDS and TDS available upon request
Molecular Structure

Typical Specification of α-BPDA

The above data is based on an available batch COA for α-BPDA CAS 36978-41-3. Final specifications, batch data and documentation should be confirmed by the latest COA before order confirmation.

Key Features in Polyimide Design

• Asymmetric aromatic dianhydride structure, relevant to  polyimide dianhydride monomers  used in optical and specialty PI systems.

• Non-symmetrical biphenyl structure may help adjust molecular packing and reduce strong  intermolecular interactions depending on the paired diamine and polymer architecture.

• High-purity α-BPDA can be considered for low-color, transparent and dielectric polyimide  materials where monomer quality and batch consistency are important.

• The aromatic dianhydride backbone may support thermal resistance and dimensional stability  in selected polyimide systems.

• Final material properties depend on dianhydride purity, diamine selection, solvent system,  imidization conditions, film formation and polymer processing method.

Pairing α-BPDA with Diamine Monomers

In polyimide synthesis, α-BPDA may be evaluated with selected polyimide diamine monomers supply portfolio to design optical, low-color, dielectric and high-performance PI systems. Fluorinated diamines such as TFMB / TFDB CAS 341-58-2 may be considered when optical clarity, low coloration, dielectric behavior or reduced moisture uptake are part of the target polymer design.

Ether-containing diamines such as BAPP CAS 13080-86-9 or TPE-Q may support processability and film-forming behavior in selected PI systems. Final performance depends on the complete diamine-dianhydride pair, formulation, purity level and processing conditions.

Application Context of α-BPDA in Polyimide Systems

α-BPDA is typically used as a structural dianhydride monomer rather than a finished application material. It is commonly considered in optical, transparent, dielectric and specialty polyimide material development where reduced coloration, thermal stability and dimensional reliability need to be balanced.

• Optical and transparent polyimide systems  – monomer selection for reduced coloration and optical clarity in PI design.

• Electronics and dielectric polyimide materials  – insulation, dielectric and high-temperature polymer material requirements.

• Specialty functional polyimide systems – α-BPDA may be evaluated in research contexts  where asymmetric aromatic dianhydride structure and polymer packing behavior are important.

• Advanced polymer R&D – α-BPDA can be considered for structure-property studies involving  optical, dielectric, thermal and mechanical performance balance.

Related Polyimide Monomer Supply Guides

For a broader technical overview of both diamine and dianhydride monomer families, please review Polyimide Monomers: Diamines and Dianhydrides.

Related Polyimide Monomers

• BPDA / s-BPDA CAS 2420-87-3  – symmetric biphenyl dianhydride for low-CTE and high-temperature PI films.

• 6FDA CAS 1107-00-2  – fluorinated dianhydride for transparent, low-dielectric and high-performance PI systems.

• TFMB / TFDB CAS 341-58-2  – fluorinated diamine often considered in transparent and low-dielectric PI material design.

COA, SDS and Technical Documentation

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