The term “dianhydride” describes a general class of fine chemical intermediate formed by the removal of water from an organic acid. The simplest example, two acyl groups bound by a common oxygen molecule, is shown above [Image 1].
Cyclic dianhydrides are very popular intermediates for epoxies, polyimides, polyesters and other resin systems. Familiar choices include Pyromellitic dianhydride (PMDA); 4,4’-Oxydiphthalic anhydride (ODPA); Hexafluoroisopropylidene-bis-phthalic dianhydride (6-FDA); and 3,3’,4,4’-Benzophenonetetracarboxylic dianhydride (BTDA®).
Dianhydrides serve as thermal curatives for epoxy resins, creating a highly-crosslinked three-dimensional polymer network. These resins find widespread use in the coating and protection of electronic components.
Polyimides are synthesized using dianhydrides as a co-monomer with diamines. Composites, fibers, films, and foams are but a few of the many applications where polyimides are called upon to provide heat resistance and dimensional stability under aggressive conditions.
Dianhydrides are used with polyesters and alkyd resins to modify their backbone structure and provide improved thermal, mechanical and chemical resistance to resin binders in a variety of coating formulations.
The functionality of dianhydrides can also be leveraged to combine different chemistries into new hybrid resin systems.
The benefits of dianhydrides are quite universal across all applications – excellent retention of properties at elevated temperatures for extended periods of time.
JAYHAWK BTDA is the legacy dianhydride with modern uses for applications requiring sustainable performance in high temperature, pressure, and aggressive chemical environments.
When you think of…
Electric motors, lighting and navigation systems in your new car;
Complex circuitry in your smartphone and tablet;
Reliable oil/gas/wind/solar power delivery;
…remember that BTDA plays a role in all of these technologies, enabling components to run without disruption and extend their service life.
JAYHAWK supplies a broad range of dianhydrides, including BTDA in powder, fine, flake, microfine, and ultrapure grades. If you would like more information about our products and how they can be used in your applications, please contact us today.