Polyimide
Encyclopedia : P : PO : POL : Polyimide
| Polymide | |
|---|---|
| Density | 1430 kg/m3 |
| Young's modulus(E) | 3200 MPa |
| Tensile strength(σt) | 75-90 MPa |
| Elongation @ break | 4-8% |
| notch test | 4-8 kJ/m2 |
| Glass temperature | >400°C |
| melting point | - |
| Vicat B[#endnote_<1>] | -C |
| heat transfer coefficient (λ) | 0.52 W/m.K |
| linear expansion coefficient (α) | 5.5 10-5 /K |
| Specific heat (c) | 1.15 kJ/kg.K |
| Water absorption (ASTM) | 0.32 |
| Price | 15-25 €/kg |
| # ↑ Deformation temperature at 10kN needle load | |
| source: A.K. vam der Vegt & L.E. Govaert, Polymeren, | |
| van keten tot kunstof, ISBN 90-407-2388-5 | |
Line diagram of the linear polyimide monomer
There are two general types of polyimides. One type, so called linear polyimides, are made by combining imides into long chains. Aromatic heterocyclic polyimides are the other usual kind, where R′ and R″ are two carbon atoms of an aromatic ring. Examples of polyimides include Kapton, Ultem, Vespel and Torlon. Polyimides have been in mass production since 1955.
See also: Polyamide
From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.