FIELD: chemistry.
SUBSTANCE: invention relates to polymer synthesis and specifically to a method for synthesis of polyamide acid and polyimides based on said polyamide acid. The method involves polycondensation of a mixture of a dianhydride of a tetracarboxylic acid and a diamine with addition of an aprotic solvent while exposing to ultrasound at frequency between 15 and 40 kHz and amplitude between 20 and 80 mcm. The method of producing polyimide from the said acid involves imidisation of the acid when exposed to ultrasound with amplitude between 20 and 80 mcm and radiation power between 1.5 and 3 kW.
EFFECT: disclosed method enables acceleration of polycondensation from 4 hours to 10-30 minutes.
5 cl, 5 ex, 1 tbl
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