Polyetherimide (PEI) is an amorphous, amber-to-transparent thermoplastic with characteristics similar to the related plastic PEEK. Relative to PEEK, PEI is cheaper, but is lower in impact strength and usable temperature. ==Structure== The molecular formula of the repeating unit of PEI is C37H24O6N2 and the molecular weight is 592 g/mol. ==Properti...
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http://en.wikipedia.org/wiki/Polyetherimide
(from the article `industrial polymers, major`) ...infusible. Kapton is stable in inert atmospheres at temperatures up to 500° C (930° F). Related commercial products are polyamideimide (PAI; ...
Found on
http://www.britannica.com/eb/a-z/p/90
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