Table 3: Thermal properties of polyimides and copolyimides containing phenolic OH groups and these polyimides reacted with 12GA.

Thermal properties
DianhydrideaDiamine12GAb
mol%mol%mol% °CAirN2AirN2Air
°C °C °C °C °C

Cyclohexene-DAHABDDE
20800248317303383430423455
50500233303284357391385430
10000283270276337356355392
208040249255371311441387459
5050100248265289329368353393
1000200226228289304367330387

6FDAHABDDE
20800263321419483550553574
50500244311403406522522562
10000250297308381394469489
208040276337383526549561574
5050100238304307450410537520
1000200250253268325404397446

DSDAHABDDE
20800254331334498502549557
50500242304315392410484489
10000248307300373383477467
208040251314321421460474524
5050100243271273333358384412
1000200252268291314346338380

aEquimolar amount of tetracarboxylic dianhydride was used to the total amount of diamines. bEquimolar amount of 12GA was used to the total amount of phenolic OH groups, and the reaction was proceeded using a equimolar amount of DCC as a catalyst. cSoftening temperature, measured by TMA at a heating rate of 10°C/min in N2 on second heating. dInitial decomposition temperature, measured by TGA at a heating rate of 10°C/min. e5% Weight loss temperature, measured by TGA at a heating rate of 10°C/min. f10% Weight loss temperature, measured by TGA at a heating rate of 10°C/min.