Table 1. The Composition of PU Samples Used in this Hydrolysis Experiment

Sample No.	1,4-BD	Isocyanate wt. (g)		DMSO wt. (g)	DBTDL wt. (g)	Solid content (wt.%)
S1	94.63 (90.12×1.05)*	MDI	250.25	3090	0.60	10.0
S2		TDI	174.26	2407	0.46	10.0
S3		H12MDI	262.40	1646	0.50	17.8
S4		IPDI	222.31	1388	0.46	18.6
S5		HDI	168.28	1189	0.37	18.1

The molar ratio of diisocyanates to 1,4-BD was kept 1.05 for all PU samples.