Table 1.

Yield of water-soluble COS, Mw, retention time (RT), polydispersity index (PI) and H₂O₂ reacted after every 48 h according to the reaction time.

Steps	Samples	Mw × 10−3 (g/mol)	PI	H2O2 reacted (%)	H2O2 in solution (%)	Yield of soluble CS (%)
Step1: heterogeneous hydrolysisa	CS	90.06 ± 0.17	1.95 ± 0.02	0.00	2,00	∼0.00
	COS2d	9.98 ± 0.08	2.74 ± 0.02	1.01	2,00	18.96 ± 0.25
	COS4d	9.24 ± 0.07	2.43 ± 0.02	1.95	2.00	46.33 ± 0.43
	COS6d	8.89 ± 0.06	1.84 ± 0.02	2.82	2.00	76.15 ± 0.81
Step 2: homogeneous hydrolysisb	COS8d	6.57 ± 0.05	1.76 ± 0.01	3.60	1.22	∼100
	COS10d	3.97 ± 0.05	1.54 ± 0.02	4.20	0.62	∼100
	COS12d	2.68 ± 0.07	1.37 ± 0.02	4.60	0.22	∼100
	COS14d	2.22 ± 0.05	1.23 ± 0.02	4.64	0.18	∼100
	COS16d	2.09 ± 0.05	1.23 ± 0.02	4.71	0.11	∼100
	COS18d	2.07 ± 0.04	1.22 ± 0.02	4.76	0.06	∼100
	COS20d	2.07 ± 0.03	1.22 ± 0.02	4.79	0.03	∼100
	COS22d	2.06 ± 0.01	1.22 ± 0.01	4.80	0.02	∼100
	COS24d	2.04 ± 0.02	1.22 ± 0.01	4.82	∼0.00	∼100

Notes: PI = Mw/Mn; The number after the COS symbol was the reaction time in days.

^aWith compensation of the reacted H₂O₂ after every 48 h.

^bWithout compensation of the reacted H₂O₂.