SYNTHESIS OF POLYAMIDES DERIVED FROM 4,9-BIS(4-AMINOPHENYL)DIAMANTANE

A series of new polyamides were synthesized by direct polycondensation of the 4,9-bis(4-aminophenyl)diamantane with various dicarboxylic aci ds. The most polyamides had high inherent viscosities, ranging from 1. 08 to 2.10 dl/g. Polyamides had tensile strength up to 92.8 MPa, and i nitial modulus reached 2.1 GPa. Although these polyamides were incorpo rated by the quite rigid diphenyldiamantane unit, surprisingly, all th ree polyamide films have tough quality. Dynamic mechanical analysis (D MA) reveals that the polyamides have three relaxations. Their a! relax ations occurred at high temperatures, ranging from 417 to 489 degrees C. All three polyamide films show rather high G' values (above 10(8) P a), even at temperatures exceeding 400 degrees C. The glass transition of polyamide derived from (+/-)1,3-cyclohexanedicarboxylic acid appea red at 417 degrees C. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.