Synthesis of Silicon-Containing Chitosan Hydrogels in a Glycolic Acid Medium

Table 1

Characterization of the hybrid silicon-chitosan-containing hydrogels.

Number	Component of the hydrogel, wt.%			CS/Si; ratio	Physicochemical parameter		Gelation time, days
	CS	Si	NaCl			pH	4°C	20°C	37°C
1	2.0	2.43	—	0.82	1.4051	2.15	5.15	4.12	2.08
2			—		1.3996	3.85	4.10	0.22	0.09
3			1.0		1.4040	4.31	1.22	0.13	0.03
4			—	0.41	1.3924	5.39	0.68	0.03	0.01
5	2.67	1.62	—	1.65	1.3854	2.13	6.88	5.95	2.13
6			—		1.3821	3.81	5.33	0.40	0.16
7			1.0		1.3870	4.22	2.41	0.14	0.05
8			—	0.82	1.3753	5.34	0.69	0.03	0.02
9	3.0	1.21	—	2.48	1.3725	2.09	14.0	10.7	3.31
10			—		1.3699	3.79	9.45	0.75	0.28
11			1.0		1.3655	4.25	2.98	0.32	0.15
12			—	1.24	1.3733	5.33	0.71	0.04	0.02
13	3.2	0.97	—	3.29	1.3740	2.09	17.6	12.0	3.88
14			—		1.3636	3.78	10.0	1.35	0.47
15			1.0		1.3639	4.22	3.30	0.36	0.23
16			—	1.65	1.3646	5.33	0.75	0.04	0.03
17	3.56	0.61	—	5.74	1.3568	2.04	31.6	18.8	11.1
18			—		1.3540	3.78	17.3	3.52	1.02
19			1.0		1.3576	4.21	6.63	0.76	0.62
20			—	2.87	1.3544	5.31	0.81	0.10	0.04
21		0.48	—	7.50	1.3509	3.77	21.9	5.03	2.52
22			1.0		1.3533	4.21	9.02	1.00	0.92
23			—	3.75	1.3502	5.28	0.88	0.22	0.12

of the system was varied by adding NaOH.