For R&D scientists and chemical engineers, a deep understanding of the chemical properties and synthesis of key intermediates is fundamental to material innovation. This article focuses on 4,4'-Oxydiphthalic Anhydride (ODPA, CAS 1823-59-2), a vital dianhydride that serves as a cornerstone for numerous high-performance polymer applications. As a leading manufacturer and supplier, we aim to illuminate the chemical nuances of ODPA and its broad utility.

4,4'-Oxydiphthalic Anhydride is characterized by its molecular formula C16H6O7 and a molecular weight of approximately 310.21 g/mol. It typically presents as a white to off-white powder, with a melting point in the range of 225-229 °C. The defining feature of ODPA is its structure, which includes two phthalic anhydride groups linked by an ether bridge. This ether linkage imparts a degree of flexibility that is often leveraged in the synthesis of polymers requiring ductility alongside high thermal stability.

Synthesis Routes for ODPA

The synthesis of ODPA can be achieved through several chemical pathways. A commonly cited method involves the reaction of 4-chlorophthalic anhydride with potassium carbonate at elevated temperatures, often in a high-boiling solvent like o-dichlorobenzene or 1,2,4-trichlorobenzene. Catalysts such as tetraphenylphosphonium bromide or hexaethylguanidine chloride can be employed to optimize reaction rates and yields. For procurement managers, understanding these synthesis methods can shed light on potential impurities and the general cost structure of ODPA production. When inquiring about ODPA, it's prudent to ask suppliers about their production processes and quality control measures to ensure you are purchasing a high-purity product suitable for your intended applications.

Another approach involves the dehydration of 4,4'-oxydiphthalic acid. The careful control of reaction conditions, including temperature, solvent, and reagent stoichiometry, is crucial for achieving high yields and the desired purity of ODPA. A reliable manufacturer will provide detailed specifications regarding the synthesis and purity of their ODPA product.

Diverse Applications of ODPA

The chemical versatility of ODPA makes it a sought-after intermediate in several high-value industries:

  • Polyimides: ODPA is a primary monomer for creating high-performance polyimides. These polymers find extensive use in the electronics industry (e.g., flexible printed circuits, insulation films), aerospace components, and high-temperature adhesives due to their exceptional thermal stability, chemical resistance, and mechanical strength.
  • Energy Storage Devices: ODPA-derived materials are integral to the development of advanced energy storage solutions. They are used in supercapacitors for their high specific capacitance and in lithium-ion batteries as potential anode materials.
  • Metal-Organic Frameworks (MOFs): The ability of ODPA to act as a ligand allows for the formation of MOFs, which are explored for applications in gas separation, catalysis, and advanced memory devices.

For R&D teams and procurement professionals looking to source high-quality ODPA, engaging with experienced manufacturers and suppliers, particularly those in China, can provide access to this critical chemical intermediate at competitive prices. Ensuring the ODPA's purity and consistent supply is paramount for successful material development.