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Pyromellitic Dianhydride

Product Introduction

Pyromellitic Dianhydride Basic information

Product Name:	Pyromellitic Dianhydride
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;Intermediates of Dyes and Pigments;Benzene derivates;fine chemicals, specialty chemicals, intermediates, electronic chemical, organic synthesis;fine chemicals, specialty chemicals, intermediates, electronic chemical, organic synthesis, functional materials;Aromatic Tetracarboxylic Dianhydrides (for High-Performance Polymer Research);Functional Materials;Reagent for High-Performance Polymer Research
Mol File:	89-32-7.mol

Pyromellitic Dianhydride Chemical Properties

Melting point	283-286 °C(lit.)
Boiling point	397-400 °C(lit.)
density	1,68 g/cm³
vapor pressure	0Pa at 25℃
refractive index	1.6000 (estimate)
Fp	380 °C
solubility	Soluble in dimethyl sulfoxide, acetone, chloroform, ethyl ether, n-hexane and benzene.
form	Fine Powder
pka	5.45[at 20 ℃]
color	White to pale yellow
Water Solubility	decomposes
Sensitive	Moisture Sensitive
BRN	213583
InChIKey	ANSXAPJVJOKRDJ-UHFFFAOYSA-N
LogP	-2.03 at 21.5℃
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)

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 Data	89-32-7(Hazardous Substances Data)

MSDS Information

Provider	Language
1,2,4,5-Benzenetetracarboxylic anhydride	English
SigmaAldrich	English
ACROS	English
ALFA	English

Pyromellitic Dianhydride Usage And Synthesis

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 is used as a monomer in the preparation of polyimide polymers such as kapton; thermoplastics such as polyesters, polyethers, plasticizers, and expoxy resins. It is involved in the preparation of high performance coatings due to its mechanical, thermal and oxidative stability properties. It acts as a curing agent for epoxy resins which find application in adhesives, coatings and molding powders. As an intermediate, it plays an important role in polyimide based materials like printed circuit boards, tape automated bonding and magnetic wire insulation.
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.
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.
General Description	Pyromellitic dianhydride (PMDA) is an acidic anhydride that can be used as a repair agent and as a chain extender in the formation of polyethylene terephthalate (PET) based chain extensions. It is mainly used in the production of thermoplastics and other coating applications.
Hazard	Skin irritant.
Flammability and Explosibility	Not classified
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.]

Pyromellitic Dianhydride Preparation Products And Raw materials

Raw materials

m-Xylene-->P-XYLENE-->Anthracene-->1,2,4-Trimethylbenzene-->Chromic acid-->1,2,4,5-Tetramethylbenzene-->N-PROPYLBENZENE-->tetramethylbenzene

Preparation Products

1,2,4,5-TETRACYANOBENZENE-->1,2,4,5-BENZENETETRACARBOXAMIDE-->PYROMELLITIC DIIMIDE-->Polyimide film-->1,2,4,5-Cyclohexanetetracarboxylic Dianhydride-->2,6-Bis(2-pyridinyl)benzo[1,2-c:4,5-c']dipyrrole-1,3,5,7-tetrone-->2,6-Bis(3-hydroxyphenyl)-1,3,5,7-tetraoxo-1,2,3,5,6,7-hexahydrobenzo[1,2-c:4,5-c']dipyrrole-->1,2,4,5-Benzenetetrakis(carbonyl chloride)-->4-pmpmd-->2,2-(1,3,5,7-tetraoxo-5,7-dihydropyrrolo(3,4-f)isoindole-2,6(1H,3H)diyl)dibenzoic acid

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