High purity Pyromellitic dianhydride CAS 89-32-7 PMDA 99% in china
PMDA;1,2,4,5-Benzenetetracarboxylic anhydride;Pyromellitic acid anhydride ;
Organic intermediate for polyimide
Pyromellitic dianhydride (PMDA) CAS 89-32-7 is an organic compound with the formula C10H2O6. It is the double carboxylic acid anhydride that is used in the preparation of polyimide polymers such as Kapton.
Pyromellitic dianhydride (PMDA) CAS 89-32-7 is an electron-acceptor, forming a variety of charge-transfer complexes. It reacts with amines to diimides, C6H2[(CO)2NR]2 which also have acceptor properties. It is prepared by gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives).
Pyromellitic dianhydride (PMDA) CAS 89-32-79 could be supplied in commercial size with competitive price.