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Pyromellitic Dianhydride

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Pyromellitic Dianhydride Basic information

Product Name:
Pyromellitic Dianhydride
CAS:
89-32-7
MF:
C10H2O6
MW:
218.12
EINECS:
201-898-9
Mol File:
89-32-7.mol
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Pyromellitic Dianhydride Chemical Properties

Melting point:
283-286 °C(lit.)
Boiling point:
397-400 °C(lit.)
Density 
1,68 g/cm3
refractive index 
1.6000 (estimate)
Flash point:
380 °C
solubility 
Soluble in dimethyl sulfoxide, acetone, chloroform, ethyl ether, n-hexane and benzene.
form 
Fine Powder
color 
White to pale yellow
Water Solubility 
decomposes
Sensitive 
Moisture Sensitive
BRN 
213583
InChIKey
ANSXAPJVJOKRDJ-UHFFFAOYSA-N
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)
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Safety Information

Hazard Codes 
Xn
Risk Statements 
41-42/43
Safety Statements 
22-24-26-37/39
WGK Germany 
1
RTECS 
DB9300000
10-21
TSCA 
Yes
HS Code 
29173980
Hazardous Substances Data
89-32-7(Hazardous Substances Data)

MSDS

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Pyromellitic Dianhydride Usage And Synthesis

Application

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.

Preparation

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.

Chemical Properties

White powder. Soluble in some organic solvents; hydrolyzes to the acid when exposed to moisture.

Uses

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.

Uses

pyromellitic dianhydride be used for preparation polyimide and epoxy resin material.

Hazard

Skin irritant.

Purification Methods

Crystallise the dianhydride from ethyl methyl ketone or dioxane. Dry, and sublime it in vacuo.[Beilstein 19 H 196, 19/5 V 407.]

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Pyromellitic DianhydrideSupplierMore

Liyang Ruipu New Materials Co., Ltd. Gold
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0519-82038123 18951201333
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J & K SCIENTIFIC LTD.
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Meryer (Shanghai) Chemical Technology Co., Ltd.
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Alfa Aesar
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400-610-6006; 021-67582000
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TCI (Shanghai) Development Co., Ltd.
Tel:
021-67121386 / 800-988-0390
Email:
Sales-CN@TCIchemicals.com
Basic information Application Preparation Safety Related Supplier