FIELD: chemistry.
SUBSTANCE: synthesis is carried out in three stages: diamine polycondensation with tetracarboxylic acid dianhydride, taken in calculated molar deficiency relative to diamine, then condensation with calculated quantity of dicarboxylic acid anhydride, which contains reactionable group, and then polycondensation with tetracarboxylic acid dianhydride, taken in adding to equimolar to diamine quantity.
EFFECT: obtaining polyamide acids with terminal reactionable groups and with specified polymerisation degree in case of application of highly active monomers.
6 cl, 2 ex
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