| 词条 | Pyromellitic dianhydride |
| 释义 |
| ImageFile = Pyromellitic dianhydride.png | ImageSize = | ImageAlt = | IUPACName = | OtherNames = |Section1={{Chembox Identifiers | CASNo = 89-32-7 | PubChem = | SMILES = }} |Section2={{Chembox Properties | Formula = C10H2O6 | MolarMass = 218.12 | Appearance = white solid | Density = | MeltingPtC = 283 to 286 | MeltingPt_notes = | BoilingPtC = 397 to 400 | BoilingPt_notes = | Solubility = hygroscopic |Section3={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = }} Pyromellitic dianhydride is an organic compound with the formula C6H2(C2O3)2. It is the double carboxylic acid anhydride that is used in the preparation of polyimide polymers such as Kapton. It is a white solid. It is prepared by gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives). An idealized equation is:[1] C6H2(CH3)4 + 6 O2 → C6H2(C2O3)2 + 6 H2O References1. ^F. Röhrscheid "Carboxylic Acids, Aromatic" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2012. {{DOI|10.1002/14356007.a05_249}} 2 : Carboxylic anhydrides|Isobenzofurans |
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