Polyetherimide
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Polyetherimide ( PEI ) is an amorphous, amber transparent, high-performance thermoplastic with the characteristics common to PEEK. Relative to PEEK, it is less temperature resistant, less expensive and lower in impact strength. It is prone to stress cracking in chlorinated solvents. It is available under the tradename Ultem, a registered trademark of General Electric, the principle developer and manufacturer.
Glass transition temperature: 216°C
Amorphous density at 25°C: 1.27 g/cc
Repeat unit: C37H24O6N2
Molecular weight of repeat unit: 592 g/mol
Polyetherimide Repeat Unit: 2D
File:Polyetherimide repeat unit.gif
Polyetherimide Repeat Unit: 3D
