Influence of diamine structure on the properties of colorless and transparent polyimides

Figures & Tables

Sample	Temperature (°C)/time (h)/pressure (Torr)
PAA	0/1/760 → 25/14/760 → 50/1/1 → 80/1/1
CPI	110/0.5/760 → 140/0.5/760 → 170/0.5/760 → 200/0.5/760 → 230/0.5/760 → 250/0.5/760

Diamine	Thickness^a (μm)	λ ₀ ^b (nm)	500nm^trans (%)	YI^c
Ⅰ	42	328	88	<1 (0.1)
Ⅱ	43	328	89	<1 (0.2)
Ⅲ	42	381	83	19.3
IV	44	360	86	4.2
V	44	358	86	3.6
VI	45	349	87	2.6
VII	46	343	88	2.2
VIII	45	392	81	27.5
IX	46	374	82	15.7

Diamine	T _g (°C)	T _D ^ia (°C)	wt _R ^600b (%)	CTE^c (ppm/°C)
Ⅰ	112	346	37	57.7
Ⅱ	130	368	36	55.7
Ⅲ	146	365	59	52.9
Ⅳ	149	367	59	49.0
Ⅴ	157	370	48	48.6
Ⅵ	165	370	55	56.3
Ⅶ	171	378	61	52.1
Ⅷ	154	382	64	56.6
Ⅸ	160	379	48	58.8

Diamine	Act	CHCl₃	CH₂Cl₂	DMAc	DMF	DMSO	MeOH	EtOH	NMP	Py	THF	Tol
I	×	◎	◎	×	△	×	×	×	○	◎	△	×
II	×	◎	◎	×	×	×	×	×	△	△	×	×
III	○	◎	◎	○	○	×	×	×	○	◎	△	×
IV	△	◎	◎	◎	◎	◎	×	×	○	◎	△	△
V	△	◎	◎	◎	◎	◎	×	×	◎	◎	◎	△
VI	△	◎	◎	◎	◎	△	×	×	◎	◎	◎	△
VII	○	◎	◎	◎	◎	○	×	×	◎	◎	◎	△
VIII	×	◎	◎	◎	◎	×	×	×	◎	◎	○	△
IX	×	◎	◎	◎	◎	○	×	×	◎	◎	◎	○

Diamine	Ult. Str.^a (MPa)	Ini. Mod.^b (GPa)	E.B.^c (%)
I	63	6.81	4
II	61	3.09	7
III	54	2.57	6
IV	22	2.23	4
V	57	2.63	4
VI	136	5.96	7
VII	92	2.87	7
VIII	95	4.71	10
IX	95	4.27	9