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Polyetherimide

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(Redirected from Ultem) Not to be confused with Polyethylenimine, also known as PEI.
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Polyetherimide
Names
Other names PEI, Ultem
Identifiers
CAS Number
ChemSpider
  • none
ECHA InfoCard 100.126.800 Edit this at Wikidata
CompTox Dashboard (EPA)
Properties
Chemical formula (C37H24O6N2)n
Molar mass Variable
Appearance Amber-to-transparent solid
Density 1.27 g/cm
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Polyetherimide (PEI; branded as Ultem) is an amorphous, amber-to-transparent thermoplastic with characteristics similar to the related plastic PEEK. When comparing PEI to PEEK, the former is cheaper but has lower impact strength and a tighter temperature range.

PEI plastics were first introduced into the market by General Electric (GE) in 1982 under the trade name Ultem.

Due to its adhesive properties and chemical stability it became a popular bed material for FFF 3D printers.

Structure

The molecular formula of the PEI repeating unit is C37H24O6N2 and the molecular weight is 592.61 g/mol. It contains phthalimide and bisphenol A sub-units.

Properties

The glass transition temperature of PEI is 217 °C (422 °F). Its amorphous density at 25 °C is 1.27 g/cm(.046 lb/in³). It is prone to stress cracking in chlorinated solvents. Polyetherimide is able to resist high temperatures while maintaining stable electrical properties over a wide range of frequencies. This high strength material offers excellent chemical resistance and ductile properties suitable for various applications, even those involving steam exposure.

References

  1. "Ultem". Curbell Plastics. Retrieved 2 November 2023.
  2. http://www.mcmaster.com/#ultem/=otzvqt Referenced Oct 7, 2013
  3. "What Is Polyetherimide (PEI)?". Retrieved 2024-10-15.
  4. Scott, Chris. "polyetherimide information and properties". www.polymerprocessing.com. Retrieved 2018-04-30.
  5. "Injection Molding Material Selection Guide". www.abtecinc.com. Retrieved 2018-04-30.
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