... chemically (Figure 1) Polyimides Based on 4-4’-Diaminotriphenylmethane (DA-TPM) Figure Synthesis of DA-TPM based PIs 6 High Performance Polymers – Polyimides Based – From Chemistry to Applications 2.4 ... Taken from [24] 20 High Performance Polymers – Polyimides Based – From Chemistry to Applications carboxylic acid groups can be deprotonated by the weak amine base [36] Consequently, COO– carboxylate ... P.V.; Tsegelskaya, A.Y High Perform Polym 2004, 16, 89 14 High Performance Polymers – Polyimides Based – From Chemistry to Applications [31] Imai, Y.; Maldar, N.N.; Kakimoto, M.A J Polym Sci.,...