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Pyromellitic dianhydride

Pyromellitic dianhydride
Pyromellitic dianhydride.png
Identifiers
89-32-7
ECHA InfoCard 100.001.726
Properties
C10H2O6
Molar mass 218.12
Appearance white solid
Melting point 283 to 286 °C (541 to 547 °F; 556 to 559 K)
Boiling point 397 to 400 °C (747 to 752 °F; 670 to 673 K)
hygroscopic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

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:


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Wikipedia

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