Method for converting macrocyclic polyimide oligomers to linear polyimides.

摘要

3OLIGOMEROS macrocyclic polyimide are prepared by reacting at least one diamine with at least one tetracarboxylic acid dianhydride or this in equimolar amounts under conditions of high dilution of said reagents. Oligomers macrocyclic ARE CAPABLE IN LINEAR CONVERSION polyimides by heating with an amine PRIMARY IN THE PRESENCE OF A macrocyclic POLYIMIDE polymerization catalyst, typically an alkaline earth or transition metal or salt thereof.