I'd appreciate examples of Thermoplastic Aromatic Polyimide processed in 1 stage ?
The common way to fully imidized Aromatic Polyimide (PI) consists of TWO stages:
1. Synthesis of polyamic acid (PAA) in aprotic solvent like DMAc, DMF or NMP; removal part of solvent and then
2. Imidization at elevated temperatures 200-350C (depending on PIs structure.
But to the best of my knowledge sometmes it happens that even during 1st stage the PAA precipitates as a powder.
Also for some thermoplastic PIs - it was observed that the imidization reaction is fully completed in solution... and the resulting PI precipitates.Or it precipitates after addition of some amount of non-solvent.
I would appreciate some examples of such PIs which:
a) could be prepared in solution (and then precipitated by addition of poor solvent)
b) or Aromatic PAAs and/or PIs - obtained in one stage in the form of powder.
Thank you. Leonid
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