Pyromellitic dianhydride PMDA 89-32-7
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Pyromellitic dianhydride is used as a monomer in the preparation of polyimide polymers such as KAPTON; thermoplastics such as polyesters, polyethers, plasticizers and epoxy resins. Due to its mechanical, thermal and oxidative stability properties, it can be used in the preparation of high-performance coatings. It can be used as a curing agent for epoxy resins in adhesives, coatings and molding powders. As an intermediate, it plays an important role in polyimide-based materials such as printed circuit boards, self-adhesive tapes, and magnetic wire insulation.
| chemical properties | White powder. Soluble in some organic solvents; hydrolyzes to acid when exposed to moisture. |
| use | Pyromellitic dianhydride (PMDA) is used as a curing agent for epoxy resins in the manufacture of castings, laminations, molding powders, adhesives and coatings. |
| use | Pyromellitic dianhydride is used as a monomer in the preparation of polyimide polymers such as KAPTON; thermoplastics such as polyesters, polyethers, plasticizers and epoxy resins. Due to its mechanical, thermal and oxidative stability properties, it can be used in the preparation of high-performance coatings. It can be used as a curing agent for epoxy resins in adhesives, coatings and molding powders. As an intermediate, it plays an important role in polyimide-based materials such as printed circuit boards, self-adhesive tapes, and magnetic wire insulation. |
| Prepare | Pyromellitic dianhydride is prepared by the gas-phase oxidation of 1,2,4,5-tetramethylbenzene (or related tetrasubstituted benzene derivatives). The idealized equation is: C6H2(CH3)4 + 6 O2 → C6H2(C2O3)2 + 6 H2O can be obtained by dehydrating pyromellitic acid with acetic anhydride in the laboratory. |
| application | As an important monomer, pyromellitic dianhydride (PMDA) is widely used to prepare a variety of thermoplastics, such as polyester, polycarbonate, polyether polyether, plasticizer, epoxy resin, etc. In addition, it can also be used For the preparation of high-performance coatings, due to their excellent thermal stability, oxidation stability and excellent mechanical properties, they have been widely used in many fields of our daily life. Pyromellitic dianhydride (PMDA) is one of several highly reactive anhydrides widely used in the production of thermoplastics and high-performance coatings. Anhydrides, including PMDA, are respiratory irritants and fast-acting sensitizers. Some anhydrides are associated with occupational asthma. PMDA has also been linked to occupational asthma. |
| general instructions | Pyromellitic dianhydride (PMDA) is an acid anhydride used as a repair agent and as a chain extender in the chain extension of polyethylene terephthalate (PET). It is mainly used in the production of thermoplastics and other coating applications. |
| adventure | Irritating to skin. |
| Flammability and explosiveness | uncategorized |
| Purification method | Dianhydride crystallized from ethyl methyl ketone or dioxane. Dry and sublimate in vacuum. [Beilstein 19 H 196, 19/5 V 407.] |
| Pyromellitic dianhydride upstream and downstream product information |
| raw material | m-xylene --> p- xylene --> anthracene --> 1,2,4-trimethylbenzene --> chromic acid --> 1,2,4,5-tetramethylbenzene --> normal Propylbenzene --> Tetramethylbenzene |
| Preparation products | 1,2,4,5-Tetracyanobenzene --> 1,2,4,5-pyromellitamide --> Pyromellitic acid diimide --> Polyimide film --> HPMDA --> 2,6-Bis(2-pyridyl)benzo[1,2-c:4,5-c']dipyrrole-1,3,5,7-tetraone --> 2,6- Bis(3-hydroxyphenyl)-1,3,5,7-tetraoxy-1, 2,3,5,6,7-hexahydrobenzo[1,2-c:4,5-c'] Dipyrrole --> 1,2,4,5-phenylenetetrakis(carbonyl chloride) --> 4-pmpmd --> 2,2-(1,3,5,7-tetraoxy-5,7-dihydro Pyrro(3,4-f)isoindole-2,6(1H,3H)diyl)dibenzoic acid |
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