Table 3. Young’s Modulus (E) for the NIPU Films Obtained from Different Diamines with 24 h Curing Time.

diamine-based NIPU	Young’s modulus(E) (MPa)	tensile stress (σ) (MPa)	tensile strain (ε) (%)
EDA	3.64	1.97	0.30
		0.95	0.02
BDA	0.99	0.59	0.30
		0.31	0.02
HDA	0.49	0.22	0.30
		0.08	0.02