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For some research I'm doing, I need to form a cast film from pellets of polyethylene isophthalate.

I'm unable to find a listed melt temperature of PEI, although as this is an isomer of PET, I can assume it is around the same temperature of 280°C. Can anyone verify this for me, and are there any recommended methods for producing a cast film?

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  • $\begingroup$ It would depends on purpose. Size for instance. Or thickness. Include more info to have a higher chance of getting a valuable answer. Spin coating is a technique using solution but probably you haven't got a "spinner" around. $\endgroup$ – Alchimista Dec 22 '18 at 16:00
  • $\begingroup$ Please give some background to this question. Film for what? What size, how thick? Why this polymer? Also it took me ten seconds on google to find the abstract of a paper that gives a melting point. onlinelibrary.wiley.com/doi/pdf/10.1002/pol.1965.110030514 This also makes it clear that the bulk substance (the pellets) has no melting point, as it doesn't usually crystallise. polymerdatabase.com/polymers/polyethyleneisophthalate.html tells you that the Tg is only 324K. $\endgroup$ – Karl Dec 22 '18 at 22:20
  • $\begingroup$ Also please note that PEI usually stands for polyether imide. The isophthalate is a speciality polymer, probably doesn't have a widely accepted abbreviation. $\endgroup$ – Karl Dec 22 '18 at 22:28

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