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{{Not to be confused with|Polyethylenimine|text=], also known as PEI}}{{More citations needed|date=September 2014}} |
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| verifiedrevid = 272441426 |
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| verifiedrevid = 399329937 |
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| ImageFile = Polyetherimid.svg |
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| ImageFile = Polyetherimid.svg |
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| ImageSize = 250px |
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| IUPACName = |
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| OtherNames = PEI |
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| OtherNames = PEI, Ultem |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 61128-46-9 |
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| CASNo = 61128-46-9 |
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| Formula = (C<sub>37</sub>H<sub>24</sub>O<sub>6</sub>N<sub>2</sub>)<sub>n</sub> |
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| Formula = (C<sub>37</sub>H<sub>24</sub>O<sub>6</sub>N<sub>2</sub>)<sub>n</sub> |
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'''Polyetherimide (PEI)''' is an amorphous, amber-to-transparent ] with characteristics similar to the related plastic ]. Relative to PEEK, PEI is cheaper, but less temperature-resistant and lower in impact strength. |
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'''Polyetherimide''' ('''PEI'''; branded as '''Ultem'''<ref name="curbell-ultem">{{cite web |title=Ultem |url=https://www.curbellplastics.com/materials/plastics/ultem/ |publisher=Curbell Plastics |access-date=2 November 2023}}</ref>) is an amorphous, amber-to-transparent ] with characteristics similar to the related plastic ]. When comparing PEI to PEEK, the former is cheaper but has lower impact strength and a tighter temperature range.<ref>http://www.mcmaster.com/#ultem/=otzvqt Referenced Oct 7, 2013</ref> |
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PEI plastics were first introduced into the market by General Electric (GE) in 1982 under the ] Ultem.<ref>{{Cite web|url=https://www.thomasnet.com/insights/what-is-polyetherimide-pei-/|title=What Is Polyetherimide (PEI)?|language=en-US|access-date=2024-10-15}}</ref> |
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Due to its ] properties and chemical stability it became a popular bed material for ] ]s. |
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==Structure== |
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==Structure== |
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The molecular formula of the PEI repeating unit is {{chem2|auto=1|C37H24O6N2}} and the ] is 592.61 g/mol.<ref>{{Cite web|url=http://www.polymerprocessing.com/polymers/PEI.html|title=polyetherimide information and properties|last=Scott|first=Chris|website=www.polymerprocessing.com|language=en|access-date=2018-04-30}}</ref> It contains ] and ] sub-units. |
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The molecular formula of repeating unit of PEI is ]<sub>37</sub>]<sub>24</sub>]<sub>6</sub>]<sub>2</sub> and the ] is 592 g/mol. |
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==Properties== |
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==Properties== |
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The ] of PEI is 216 °C. Its amorphous ] at 25 °C is 1.27 g/cc. It is prone to stress cracking in ]s. |
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The ] of PEI is 217 °C (422 °F). Its amorphous ] at 25 °C is 1.27 g/cm<sup>3</sup>(.046 lb/in³). It is prone to stress cracking in ]s. 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.<ref>{{Cite web|url=http://www.abtecinc.com/production/materials/|title=Injection Molding Material Selection Guide|website=www.abtecinc.com|language=en-US|access-date=2018-04-30}}</ref> |
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==Ultem== |
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== References == |
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Ultem is a family of PEI products manufactured by ] as a result of acquiring the General Electric Plastics Division in 2007. Ultem resins are used in medical and chemical instrumentation due to their heat resistance, ] resistance and ] resistance. Ultem 1000 (standard, unfilled polyetherimide) has a high dielectric strength, natural flame resistance, and extremely low smoke generation. Ultem has high mechanical properties and performs in continuous use to 340°F (170°C). Ultem is also used in guitar picks, most notably by the ] (Ultex series) and InTune (Ultem-X series) companies. |
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==References== |
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{{Unreferenced|date=January 2009}} |
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{{reflist}} |
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