Uses: used for polyimide resin, high temperature resistant electrical insulating paint, PVC plasticizer, synthetic resin crosslinking agent and epoxy resin curing agent, as well as phthalocyanine blue dye

Physicochemical properties white yellowish massive powder solid crystal It is soluble in dimethyl sulfoxide, dimethylformamide and acetone

Synonyms:1,2,4,5-Benzenetetracarboxylic 1,2:4,5-dianhydride;1,2,4,5benzenetetracarboxylic1,2:4,5dianhydride;1,2,4,5-benzenetetracarboxylic1,2:4,5-dianhydride;1,2,4,5-Benzenetetracrboxylicdianhydride;pyromelliticacidanhydride;pyromelliticaciddianhydride;Pyromelliticanhydride;1,2,4,5-BENZENETETRACARBOXYLIC ANHYDRIDE

CAS:89-32-7

MF:C10H2O6

MW:218.12

EINECS:201-898-9

Product Categories:fine chemicals;Organics;fine chemicals, specialty chemicals, intermediates, electronic chemical, organic synthesis;fine chemicals, specialty chemicals, intermediates, electronic chemical, organic synthesis, functional materials;Intermediates of Dyes and Pigments;Benzene derivates;Aromatic Tetracarboxylic Dianhydrides (for High-Performance Polymer Research);Functional Materials;Reagent for High-Performance Polymer Research

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)

Fp 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

InChIKeyANSXAPJVJOKRDJ-UHFFFAOYSA-N

CAS DataBase Reference89-32-7(CAS DataBase Reference)

NIST Chemistry Reference1,2,4,5-Benzenetetracarboxylic anhydride(89-32-7)

EPA Substance Registry System1H,3H-Benzo[1,2-c:4,5-c']difuran-1,3,5,7-tetrone (89-32-7)

Safety Information

Hazard Codes Xn

Risk Statements 41-42/43

Safety Statements 22-24-26-37/39

WGK Germany 1

RTECS DB9300000

F 10-21

TSCA Yes

HS Code 29173980

Hazardous Substances Data89-32-7(Hazardous Substances Data)

MSDS Information

ProviderLanguage

1,2,4,5-Benzenetetracarboxylic anhydrideEnglish

SigmaAldrichEnglish

ACROSEnglish

ALFAEnglish

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

UsesPyromellitic dianhydride (PMDA) is employed as a curing agent for epoxy agent resins used for casting, laminating, the manufacture of moulding powders, adhesives and coatings.

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

HazardSkin irritant.

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