Thermal Comparative Study on Epoxy Resin Networks with Amic Acid and their Corresponding Imides

Abstract

This work deals with the preparation and thermal investigation of eleven
Epoxy-amic acid or Imide networks. The following monobasic amic acids were used:
PMA, 2CMA, 3CMA, 2,6DCMA, 2BMA, 4NMA, 2HMA and 2MMA. Also the
following dibasic amic acids were prepared: 1,2PBMA, 1,4PBMA and 2,5TBMA.
After characterization with IR spectroscopy, thermal behaviour of the networks were
investigated by using differential thermal analysis (DTA). The comparison of T1 and
T4 values of amic acids alone with those in the networks shows that T1 values are
lower and T4 values are higher in networks. As well as, the similarity of T1 and T4
values of amic acid networks with those of imide networks. The derivation of T2 and
T3 values reveals that cyclo-dehydration process affects T2 and T3 positions but not the
initial or final positions.