|
| | 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;pyromelliticacidanhydride;pyromelliticaciddianhydride;Pyromelliticanhydride;BENZENE-1,2,4,5-TETRACARBOXYLIC DIANHYDRIDE;BENZENE-1,2,4,5-TETRACARBOXYLIC 1,2,4,5-DIANHYDRIDE | | 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 | | 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) |
| | 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 | Notclassified | | 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-->HPMDA-->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 |
|
