Pyromellitic Dianhydride Chemical Properties
- Melting point:
- 283-286 °C(lit.)
- Boiling point:
- 397-400 °C(lit.)
- 1,68 g/cm3
- refractive index
- 1.6000 (estimate)
- Flash point:
- 380 °C
- Soluble in dimethyl sulfoxide, acetone, chloroform, ethyl ether, n-hexane and benzene.
- Fine Powder
- White to pale yellow
- Water Solubility
- Moisture Sensitive
- CAS DataBase Reference
- 89-32-7(CAS DataBase Reference)
- NIST Chemistry Reference
- 1,2,4,5-Benzenetetracarboxylic anhydride(89-32-7)
- EPA Substance Registry System
- 1H,3H-Benzo[1,2-c:4,5-c']difuran-1,3,5,7-tetrone (89-32-7)
Pyromellitic Dianhydride Usage And Synthesis
Pyromellitic dianhydride (PMDA) has been used extensively as an important monomer in the preparation of a variety of thermoplastics such as polyesters, polycarbonates, polyethers polyethers, plasticizersplasticizers, expoxy resins, etc. Moreover, it is also useful in the preparation of high performance coatings that have been widely employed in many fields in our daily life beacuase of its excellent thermal, oxidative stability and excellent mechanical properties.
Pyromellitic dianhydride (PMDA) is one of several highly reactive acid anhydrides and used extensively in the production of thermoplastics and high-performance coatings. Anhydrides including PMDA are respiratory irritants and immediate-type sensitisers. Some anhydrides have been associated with occupational asthma. PMDA has also been related to occupational asthma.
Pyromellitic Dianhydride is prepared by gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives). An idealized equation is:
C6H2(CH3)4 + 6 O2 → C6H2(C2O3)2 + 6 H2O
In the laboratory, it can be prepared by dehydration of pyromellitic acid using acetic anhydride.
White powder. Soluble in some organic solvents; hydrolyzes to the acid when exposed to moisture.
Pyromellitic dianhydride (PMDA) is employed as a curing agent for epoxy agent resins used for casting, laminating, the manufacture of moulding powders, adhesives and coatings.
pyromellitic dianhydride be used for preparation polyimide and epoxy resin material.
Crystallise the dianhydride from ethyl methyl ketone or dioxane. Dry, and sublime it in vacuo.[Beilstein 19 H 196, 19/5 V 407.]
Pyromellitic Dianhydride Preparation Products And Raw materials
- Dimethyl terephthalate
- Methyl 4-formylbenzoate
- pyromelltic acid dianhydride
- 3,4,9,10-Perylenetetracarboxylic dianhydride
- 4,4'-Oxydiphthalic anhydride
- Maleic anhydride
- Acetic anhydride
- Phthalic anhydride
- Glutaric anhydride
- Erythromycin Estolate
- Di-tert-butyl dicarbonate
- Succinic anhydride
- 3,3',4,4'-Biphenyltetracarboxylic dianhydride
- Pyromellitic acid
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