|Young's modulus(E)||3200 MPa|
|Tensile strength(t)||75-90 MPa|
|Elongation @ break||4-8%|
|notch test||4-8 kJ/m|
|Glass temperature||>400 °C|
|Vicat B||220(?) °C|
|Thermal conductivity (k)||0.52 W/m.K|
|linear expansion coefficient ()||5.5 10-5 /K|
|Specific heat (c)||1.15 kJ/kg.K|
|Water absorption (ASTM)||0.32|
|Dielectric constant (Dk) at 1MHz||3.5|
Thermosetting polyimides are commercially available as uncured resins, stock shapes, thin sheets, laminates and machines parts. Thermoplastic polyimides are very often called pseudothermoplastic. 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 polyimide films include Apical, Kapton, Norton TH and Kaptrex. Polyimide parts and shapes include Meldin, Vespel and Plavis. Polyimides have been in mass production since 1955.
Typical polyimide parts are not affected by commonly used solvents and oils — including hydrocarbons, esters, ethers, alcohols and freons. They also resist weak acids but are not recommended for use in environments that contains alkalis or inorganic acids. Some polyimides, such as CP1 and CORIN XLS, are solvent-soluble and exhibit high optical clarity. The solubility properties lend them towards spray and low temperature cure applications.
Polyimide is often used in the electronics industry for flexible cables, as an insulating film on magnet wire and for medical tubing For example, in a laptop computer, the cable that connects the main logic board to the display (which must flex every time the laptop is opened or closed) is often a polyimide base with copper conductors. The semiconductor industry uses polyimide as a high-temperature adhesive; it is also used as a mechanical stress buffer. Some polyimide can be used like a photoresist; both "positive" and "negative" types of photoresist-like polyimide exist in the market.
Polyimide tubing: dispelling the myths: the capabilities and potential of polyimide and polyimide tubing are gaining popularity in the medical design market place as a result of the increasing need for minimally invasive surgical devices. This article looks at the myths surrounding the tubing to better understand its advantages for medical applications.(manufacturing)
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