Soluble Polyimides Bearing Long-Chain Alkyl Groups on Their Side Chain via Polymer Reaction

Table 3

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

					Thermal properties
Dianhydride^a	Diamine		12GA^b	𝑇𝑠^c	𝑇𝑑0^d		𝑇𝑑5^e		𝑇𝑑10^f
mol%	mol%		mol%	°C	Air	N2	Air	N2	Air
					°C	°C	°C	°C	°C
Cyclohexene-DA	HAB	DDE
	20	80	0	248	317	303	383	430	423	455
	50	50	0	233	303	284	357	391	385	430
	100	0	0	283	270	276	337	356	355	392
	20	80	40	249	255	371	311	441	387	459
	50	50	100	248	265	289	329	368	353	393
	100	0	200	226	228	289	304	367	330	387
6FDA	HAB	DDE
	20	80	0	263	321	419	483	550	553	574
	50	50	0	244	311	403	406	522	522	562
	100	0	0	250	297	308	381	394	469	489
	20	80	40	276	337	383	526	549	561	574
	50	50	100	238	304	307	450	410	537	520
	100	0	200	250	253	268	325	404	397	446
DSDA	HAB	DDE
	20	80	0	254	331	334	498	502	549	557
	50	50	0	242	304	315	392	410	484	489
	100	0	0	248	307	300	373	383	477	467
	20	80	40	251	314	321	421	460	474	524
	50	50	100	243	271	273	333	358	384	412
	100	0	200	252	268	291	314	346	338	380

^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.